Abrupt monsoon transitions as seen in paleo-records can be explained by. Long version of Comment on Near-linear response of mean monsoon strength to a
|
|
- Jocelyn Preston
- 5 years ago
- Views:
Transcription
1 1 2 Abrut monsoon transitions as seen in aleo-records can be exlained by moisture-advection feedback 3 4 Long version of Comment on Near-linear resonse of mean monsoon strength to a broad range of radiative forcings by W.. Boos and T. Storelvmo 5 A. Levermann 1,2,3,*, V. Petoukhov 1, J. Schewe 1, H.J. Schellnhuber 1, Potsdam Institute for Climate Imact esearch, Potsdam, Germany 2 Columbia University, New York, USA 3 Potsdam University, Potsdam, Germany 4 Santa Fe Institute, Santa Fe, New Mexico, USA * corresondence should be addressed to: anders.levermann@ik-otsdam.de Abrut monsoon changes exist in aleo-records Paleo-climatic records show evidence of abrut and strong monsoon shifts during the last two glacial cycles (Burns et al. 2003; Wang 2005; Wang et al. 2008), the last deglaciation (Stager et al. 2011) and the Holocene (Guta et al. 2003; Hong et al. 2003; Wang 2005; Berkelhammer et al. 2013; Dixit et al. 2014) in India, the Bay of Bengal, and East Asia. While some of these shifts have been linked either to variations in solar insolation or to climatic changes in other arts of the lanet, they are often much more abrut and/or larger than exected for a linear resonse to external forcing, thus suggesting that monsoon systems may be caable of non-linear transitions. Such transitions were first reroduced in a concetual model by (Zickfeld et al. 2005) and 1
2 later for the more secific case of the Wang et al data by (Schewe et al. 2012). Levermann et al. (2009) carved out the hysical mechanism for such transition in a very simle concetual model stating in the abstract "Though details of monsoon circulations are comlicated, observations reveal a defining moisture-advection feedback that dominates the seasonal heat balance and might act as an internal amlifier, leading to abrut changes in resonse to relatively weak external erturbations. Here we resent a minimal concetual model caturing this ositive feedback." 30 Both concetual models agree when oerating in hysically reasonable regime Boos & Storelvmo (2015) based their article on the statement that the introduction of adiabatic cooling into the concetual monsoon model of Levermann et al. (2009) eliminates the abrut transitions. That is not true as can be seen in their figure 1a. Boos & Storelvmo obtain the same abrut transition if the adiabatic cooling is not comensating for the latent heat release. Thus their argument is based on the assumtion that most of the energy from latent heat release is consumed by adiabatic cooling. While we are obviously aware of the existence of the hysical rocess of adiabatic cooling (and show below that it is imlicitly accounted for in our model), it is not a valid assumtion that most of the latent heat release is consumed by this rocess. To the contrary, the monsoon circulation over the continent is redominantly sustained by the release of latent heat and subsequent warming of the atmosheric column over land as stated in a number of classic studies as for examle (Webster et al. 1998) For that reason we deliberately addressed in our minimalistic model (and we clearly declared this in the article) the simlest, but fundamentally imortant cases with 2
3 redominantly advective character of the low-atmoshere circulations in the main monsoon regions. These situations are illustrated by Figure S2 from our article, where we showed mas of the low-trooshere winds over these regions, with dominant contribution from the advective comonent. It is further shown in our Figure 2 which comares the latent heat release to other energy comonents for different regions Adiabatic cooling in the Levermann et al. (2009) model A very secific incororation of adiabatic cooling into our concetual model let Boos and Storelvmo (2015) to their central result of a vanishing of the threshold in monsoon rainfall. The secific reresentation they choose is based on an aroximation of the second horizontal derivative of the temerature by a linear function of its first horizontal derivative (horizontal velocity), dividing the velocity scale by the horizontal length scale (their equations (1)-(3) and (S1) and (S2)). This aroximation is very crude. Here we show that our model imlicitly incororates adiabatic cooling without eliminating the ossibility of abrut monsoon transitions as seen in aleo-records: Levermann et al aer is based on the classical equations and conventional assumtions. In that article we start with the equation for the secific entroy (see, e.g., (Lorenz 1967, age 13)) in z-coordinate: 63 ds dt Q = T m, (1) 3
4 where s = c lnϑ is the secific entroy of the air, c and ϑ are the secific heat at constant ressure and the otential temerature of the air, t is time, Qm is the net heating rate er unit mass, and T is kinetic temerature. Multilying the left hand side of equation (1) by the air density ρ and using the continuity equation yields: 68 ds ρ s ρ = dt t + ( ρ sv ), (2) where / t is the artial derivative with resect to time, is the three-dimensional gradient vector, V is the three-dimensional vector of atmosheric velocity, and is a scalar multilication sign. Integrating equation (2) with resect to z vertically from the earth's surface to the trooause and horizontally over the monsoon land region, assuming quasi-stationarity of the rocess and imosing zero boundary conditions on the vertical velocity w at the surface and at the trooause, z tr, using equation (2) one obtains 76 c z tr ztr ϑ ztr ϑ ( H ρϑvh dz) dσ = (, ) (, 0 QV Pdz dσ + 0 QV T 0 T dz) dσ, (3) 77 where H is the horizontal gradient vector, V H is the vector of the horizontal velocity, 78 is the total area of the monsoon land region, while Q V, P V and Q, are, resectively the net heating rate er unit volume due to the condensation and radiation. In our simle monsoon model we neglected the sensible heat flux at the land surface. The condensation heating rate is ositive throughout the entire trooshere. The radiation heating rate is non-ositive throughout the entire trooshere in the monsoon land 4
5 83 84 regions (McFarlane et al. 2007). The factor ϑ / T is ositive in the trooshere. Thereby one can bring this factor outside the integrals in the right side of equation (3), 85 reresenting it by constant arameters S P, and S, resectively, in the first and second terms in the right hand side of equation (3). We can denote S P, and S integral static stability arameters of the monsoon land system, associated with the condensation and radiation rocesses. This way, the deviation of as the ϑ / T from 1 is the indicator of the contribution from the vertical motions to the atmoshere heat balance: in 90 the adiabatic (i.e., with T = ϑ ) atmoshere the vertical motions could not contribute to the heat balance. Equating condensation to reciitation rate over the monsoon land region and rescribing as the arameter the ratio ε = H / L, where H and L are resectively, the vertical extent of the lower branch of the monsoon inflow to the land and the horizontal scale (distance between the coast line and the remote boundary of the monsoon region, see Levermann et al. 2009), we get the equation whose general structure is identical to Eq. (1) from that aer, namely 97 LPS ε c W T + S = 0, (4) P where L is the latent heat of condensation, P and are the averaged over the entire monsoon land region reciitation and radiation rates er unit square, and 100 W = α T, (5) where α is a constant arameter and T = T L T > 0 is atmosheric temerature difference between land and ocean. O 5
6 When deriving equation (4) we use a conventional reresentation of the otential temerature ϑ T + γ z within the trooshere, where γ A is the constant adiabatic A lase rate, so that the horizontal derivatives of ϑ and T match u in that case A conservation law for the water vaor mass laces a condition that an overall influx of the water vaor into the system should be equal to zero, for the steady states. This means, in our case, that in the absence of the land evaoration and under the condition that the vertical velocity is zeroed at the surface and at the trooause, an overall (integrated over the entire side surface of the monsoon land region) income of water vaor at the lateral boundaries of the system should be balanced by the outcome of water vaor due to reciitation rate integrated over the entire lower surface of the monsoon land region. Going this way we get the equation for the atmosheric humidity that is identical to the equation (3) from Levermann et al. 2009: 115 ε Wρ ( q q ) P = 0, (6) O L 116 where q O and q L are the secific humidity over ocean and land, resectively. 117 We further reresent P as follows (see Levermann et al. 2009): 118 P = β q L, (7) 119 where β is constant arameter. Finally, combining equations (4) - (7) one can get 120 W β α αβ ( LS Pβ qo + S ) W 2 ε c ε ρc W S ερ = 0, (8) 6
7 The general structure of this equation is identical to that of the governing equation in Levermann et al As a consequence, the threshold behavior is not eliminated by adiabatic cooling unless it consumes ractically all of the energy of the latent heat release eferences Berkelhammer, M. et al., An Abrut Shift in the Indian Monsoon 4000 Years Ago. In Climates, Landscaes, and Civilizations. American Geohysical Union, Available at: htt://dx.doi.org/ /2012gm Boos, W.. & Storelvmo, T., Near-linear resonse of mean monsoon strength to a broad range of radiative forcings., I(1) Burns, S.J. et al., Indian Ocean climate and an absolute chronology over Dansgaard/Oeschger events 9 to 13. Science (New York, N.Y.), 301(5638), Dixit, Y., Hodell, D.A. & Petrie, C.A., Abrut weakening of the summer monsoon in northwest India ~4100 yr ago. Geology, 42(4), Guta, A.K., Anderson, D.M. & Overeck, J.T., Abrut changes in the Asian southwest monsoon during the Holocene and their links to the North Atlantic Ocean. Nature, 421(6921), Hong, Y.T. et al., Correlation between Indian Ocean summer monsoon and North Atlantic climate during the Holocene. Earth and Planetary Science Letters, 211(3-7
8 142 4), Levermann, A. et al., Basic mechanism for abrut monsoon transitions. Proceedings of the National Academy of Sciences of the United States of America, 106(49), Lorenz, E.N., The nature and theory of the general circulation of the atmoshere, World Meteorological Organization Geneva McFarlane, S., Mather, J. & Ackerman, T., Analysis of troical radiative heating rofiles: A comarison of models and observations. Journal Geohysical esearch, 112,.D Schewe, J., Levermann, A. & Cheng, H., A critical humidity threshold for monsoon transitions. Climate of the Past, 8(2), Stager, J. et al., Catastrohic Drought in the Afro-Asian Monsoon egion During Heinrich Event 1. Science, 331(March), Wang, Y. et al., Millennial- and orbital-scale changes in the East Asian monsoon over the ast 224,000 years. Nature, 451(7182), Available at: htt:// Wang, Y., The Holocene Asian Monsoon: Links to Solar Changes and North Atlantic Climate. Science, 308(5723), Available at: htt:// Webster, P.J. et al., Monsoons: Processes, redictability, and the rosects for rediction. Journal of Geohysical esearch, 103(C7),
9 Zickfeld, K. et al., Is the Indian summer monsoon stable against global change? Geohysical esearch Letters, 32(15),
Pseudoadiabatic chart / sonde diagram
Pseudoadiabatic chart / sonde diagram T = T θ 0 R c = θ const R c This can be lotted with a logarithmic scale for the ressure. The lines for constant otential temerature is following the dry adiabatic
More informationAtmospheric stability
Atmosheric stability The stability or instability of the atmoshere (or a layer thereof) is the state of the atmoshere with resect to the reaction of a volume or arcel of air to a vertical islacement. The
More informationFor convection, we need the environmental temperature to drop faster than the adiabatic lapse rate with height.
Main equations/relations from Lecture 2: Buoyancy: b F tot /m = -g(ρ ρ E )/ ρ Convection in water: If ρ 0, and it will accelerate uwards. If ρ >ρ E, the arcel is
More informationAir Sea Interaction and the Seasonal Cycle of the Subtropical Anticyclones*
1948 JOURNAL OF CLIMATE Air Sea Interaction and the Seasonal Cycle of the Subtroical Anticyclones* RICHARD SEAGER Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York RAGU MURTUGUDDE
More informationEntrainment of Air into a Balcony Spill Plume
Entrainment of Air into a Balcony Sill Plume ROGER HARRISON 1, AND MICHAEL SPEARPOINT 2 1 BRE Fire and Security (incororating the Fire Research Station [FRS]), BRE, Watford, WD25 9XX, UK. 2 Deartment of
More informationScott Denning CSU CMMAP 1
Thermodynamics, Buoyancy, and Vertical Motion Temperature, Pressure, and Density Buoyancy and Static Stability Adiabatic Lapse Rates Dry and Moist Convective Motions Present Atmospheric Composition What
More informationAtmospheric & Ocean Circulation-
Atmospheric & Ocean Circulation- Overview: Atmosphere & Climate Atmospheric layers Heating at different latitudes Atmospheric convection cells (Hadley, Ferrel, Polar) Coriolis Force Generation of winds
More informationThe Air-Sea Interaction. Masanori Konda Kyoto University
2 The Air-Sea Interaction Masanori Konda Kyoto University 2.1 Feedback between Ocean and Atmosphere Heat and momentum exchange between the ocean and atmosphere Atmospheric circulation Condensation heat
More informationDESIGN CHALLENGES FOR DISTRIBUTION OVERHEAD LINES SUBJECT TO HIGH IMPACT LOW PROBABILITY EVENTS
Paer 1353 DESIGN CALLENGES FOR DISTRIBUTION OVEREAD LINES SUBJECT TO IG IMPACT LOW PROBABILITY EVENTS Alessandro P. DADAM Fernando. MOLINA Sergio L. S. CABRAL CELESC Distribuição - Brazil CELESC Distribuição
More informationSpring School on Fluid Mechanics and Geophysics of Environmental Hazards 19 Apr 2 May Institute for Mathematical Sciences
Spring School on Fluid Mechanics and Geophysics of Environmental Hazards 19 Apr 2 May 2009 Institute for Mathematical Sciences EXTREME RAIN AND WIND STORMS IN THE MID-LATITUDES: a problem of possible maximum
More informationGuide on static dilution method for NO, NO 2 and SO 2 at limit values
Guide on static dilution method for NO, NO 2 and SO 2 at limit values January 2014 Written by: Klaus Wirtz (Umweltbundesamt - The federal Environment Agency) Tatiana Macé (Laboratoire national de métrologie
More informationLecture 14. Heat lows and the TCZ
Lecture 14 Heat lows and the TCZ ITCZ/TCZ and heat lows While the ITCZ/TCZ is associated with a trough at low levels, it must be noted that a low pressure at the surface and cyclonic vorticity at 850 hpa
More informationATMS 310 Tropical Dynamics
ATMS 310 Tropical Dynamics Introduction Throughout the semester we have focused on mid-latitude dynamics. This is not to say that the dynamics of other parts of the world, such as the tropics, are any
More informationLocal Winds. Please read Ahrens Chapter 10
Local Winds Please read Ahrens Chapter 10 Scales of Motion Microscale: meters Turbulent eddies Formed by mechanical disturbance or convection Lifetimes of minutes Mesoscale: km s to 100 s of km s Local
More informationAtmospheric & Ocean Circulation- I
Atmospheric & Ocean Circulation- I First: need to understand basic Earth s Energy Balance 1) Incoming radiation 2) Albedo (reflectivity) 3) Blackbody Radiation Atm/ Ocean movement ultimately derives from
More information2.4. Applications of Boundary Layer Meteorology
2.4. Applications of Boundary Layer Meteorology 2.4.1. Temporal Evolution & Prediction of the PBL Earlier, we saw the following figure showing the diurnal evolution of PBL. With a typical diurnal cycle,
More informationPENALIZED LOGISTIC REGRESSION TO ASSESS NFL QUARTERBACK PERFORMANCE
PENALIZED LOGISTIC REGRESSION TO ASSESS NFL QUARTERBACK PERFORMANCE 4/26/2016 Abstract [Draw your reader in with an engaging abstract. It is tyically a short summary of the document. When you re ready
More informationChapter 2. Turbulence and the Planetary Boundary Layer
Chapter 2. Turbulence and the Planetary Boundary Layer In the chapter we will first have a qualitative overview of the PBL then learn the concept of Reynolds averaging and derive the Reynolds averaged
More informationSIO20 - Midterm Examination 2 v1 Winter Section A. Circle the letter corresponding to the best answer. (1 point each)
NAME: Section A. Circle the letter corresponding to the best answer. (1 point each) 1. Rainbows result from: a. refraction and reflection of sunlight by water droplets b. reflection of sunlight by oceans
More informationLONG- TERM CHANGE IN PRE- MONSOON THERMAL INDEX OVER CENTRAL INDIAN REGION AND SOUTH WEST MONSOON VARIABILITY
LONG- TERM CHANGE IN PRE- MONSOON THERMAL INDEX OVER CENTRAL INDIAN REGION AND SOUTH WEST MONSOON VARIABILITY *S.S. Dugam Indian Institute of Tropical Meteorology, Pune-411008 *Author for Correspondence
More informationGoals. Unconditional stability Conditional stability Buoyancy Buoyancy waves
Stability and waves Goals Unconditional stability Conditional stability Buoyancy Buoyancy waves Moist adiabatic lapse rate Archimedes principle A body immersed in a fluid is buoyed up by a force equal
More informationSea and Land Breezes METR 4433, Mesoscale Meteorology Spring 2006 (some of the material in this section came from ZMAG)
Sea and Land Breezes METR 4433, Mesoscale Meteorology Spring 2006 (some of the material in this section came from ZMAG) 1 Definitions: The sea breeze is a local, thermally direct circulation arising from
More informationMODELING INDIAN OCEAN CIRCULATION: BAY OF BENGAL FRESH PLUME AND ARABIAN SEA MINI WARM POOL
MODELING INDIAN OCEAN CIRCULATION: BAY OF BENGAL FRESH PLUME AND ARABIAN SEA MINI WARM POOL P. N. Vinayachandran* 1 1, *2 and J. Kurian* * 1 Centre for Atmospheric and Oceanic Sciences, Indian Institute
More informationVI. Static Stability. Consider a parcel of unsaturated air. Assume the actual lapse rate is less than the dry adiabatic lapse rate: Γ < Γ d
VI. Static Stability Consider a parcel of unsaturated air. Assume the actual lapse rate is less than the dry adiabatic lapse rate: Γ < Γ d VI. Static Stability Consider a parcel of unsaturated air. Assume
More informationEffect of late 1970 s Climate Shift on Interannual Variability of Indian Summer Monsoon Associated with TBO
Effect of late 97 s Climate Shift on Interannual Variability of Indian Summer Monsoon Associated with TBO 7. Introduction Biennial variability has been identified as one of the major modes of interannual
More informationReview for the second quarter. Mechanisms for cloud formation
Review for the second quarter Mechanisms for cloud formation 1 Rising air expands and cools; Sinking air compresses and warms. (18) (24) Dry adiabatic lapse rate (10 o C/km): the rate of temperature decrease
More informationWinds and Ocean Circulations
Winds and Ocean Circulations AT 351 Lab 5 February 20, 2008 Sea Surface Temperatures 1 Temperature Structure of the Ocean Ocean Currents 2 What causes ocean circulation? The direction of most ocean currents
More informationLecture 13 El Niño/La Niña Ocean-Atmosphere Interaction. Idealized 3-Cell Model of Wind Patterns on a Rotating Earth. Previous Lecture!
Lecture 13 El Niño/La Niña Ocean-Atmosphere Interaction Previous Lecture! Global Winds General Circulation of winds at the surface and aloft Polar Jet Stream Subtropical Jet Stream Monsoons 1 2 Radiation
More informationRECTIFICATION OF THE MADDEN-JULIAN OSCILLATION INTO THE ENSO CYCLE
RECTIFICATION OF THE MADDEN-JULIAN OSCILLATION INTO THE ENSO CYCLE By William S. Kessler and Richard Kleeman Journal of Climate Vol.13, 1999 SWAP, May 2009, Split, Croatia Maristella Berta What does give
More informationOn the buoyancy-driven theory of the Atlantic Meridional Overturning Circulation
On the buoyancy-driven theory of the Atlantic Meridional Overturning Circulation Rémi Tailleux Department of Meteorology, University of Reading AMOC Meeting, Brest, 4 May 217 Outline A survey of thermodynamic
More informationGeophysical Fluid Dynamics of the Earth. Jeffrey B. Weiss University of Colorado, Boulder
Geophysical Fluid Dynamics of the Earth Jeffrey B. Weiss University of Colorado, Boulder The Earth is a spinning sphere Coriolis force depends on latitude solar flux depends on latitude Michael Ritter,
More informationMonsoon. Arabic word mausim means season. Loose definition: a wind/precipitation pattern that shifts seasonally
Monsoon Arabic word mausim means season Loose definition: a wind/precipitation pattern that shifts seasonally Classical criteria (Ramage 1971) Prevailing wind shifts 120 o between Jan & July Average frequency
More informationSports Analytics Workshop
Sorts Analytics Worksho Sotirios Drikos sdrikos@gmail.com www: drikos.weebly.com Performance Analysis in and Related Sorts. 1 List of Contents Performance Analysis Performance Indicators Net & Wall Games
More informationConditions for Offshore Wind Energy Use
Carl von Ossietzky Universität Oldenburg Institute of Physics Energy Meteorology Group Detlev Heinemann Conditions for Offshore Wind Energy Use Detlev Heinemann ForWind Carl von Ossietzky Universität Oldenburg
More informationSIO 210 Problem Set 3 November 4, 2011 Due Nov. 14, 2011
SIO 210 Problem Set 3 November 4, 2011 Due Nov. 14, 2011 1. At 20 N, both the ocean and the atmosphere carry approximately 2 PW of heat poleward, for a total of about 4 PW (see figure). If (at this latitude)
More informationTEMPERATURE FIELD INSIDE THE DIAPHRAGM GAS METER
TEMPERATURE FIELD INSIDE THE DIAPHRAGM GAS METER Tomáš Hlinčík, Václav Koza Deartment of Gas, Coke and Air Protection, University of Chemistry and Technology Prague, Technická 5, 16628 Praha 6, e-mail:
More informationMeteorology. Circle the letter that corresponds to the correct answer
Chapter 7 Worksheet 2 Meteorology Name: Circle the letter that corresponds to the correct answer 1) Which of the following factors contributes to the general subsidence in the latitude zone 20 degrees
More informationdt V I. OBJECTIVE OF THE EXPERIMENT
I. OBJECTIVE OF THE EXPERIMENT Detere the effective throughut (ug kinetics) and the limiting ressure of a vane um and a diffusion um. tudy the temerature-ressure diagram of nitrogen, in articular the trile
More informationISOLATION OF NON-HYDROSTATIC REGIONS WITHIN A BASIN
ISOLATION OF NON-HYDROSTATIC REGIONS WITHIN A BASIN Bridget M. Wadzuk 1 (Member, ASCE) and Ben R. Hodges 2 (Member, ASCE) ABSTRACT Modeling of dynamic pressure appears necessary to achieve a more robust
More informationc p t T + c p v T + ω p s = Q c + S net + R net + SH, (1)
The EASM, unlike other tropical monsoons, is characterized by mixed tropical and midlatitude influences with frontal systems and jet stream effects (Ding and Chan, 2005; Molnar et al., 2010). Previous
More informationIndian Ocean Seasonal Cycle Jérôme Vialard (IRD) LOCEAN Paris France From Schott & McCreary (Prog. Oc.
Indian Ocean Seasonal Cycle Jérôme Vialard (IRD) LOCEAN Paris France jerome.vialard@ird.fr From Schott & McCreary (Prog. Oc. 2001) Outline The monsoon cycle The basin-scale dynamical response Thermocline
More informationTraining for Environmental Risks in the Black Sea Basin
htt://www.transnav.eu the International Journal on Marine Navigation and Safety of Sea Transortation Volume 8 Number 2 June 2014 DOI: 10.12716/1001.08.02.05 Training for Environmental Risks in the Black
More informationMeteorology I Pre test for the Second Examination
Meteorology I Pre test for the Second Examination MULTIPLE CHOICE 1. A primary reason why land areas warm up more rapidly than water areas is that a) on land, all solar energy is absorbed in a shallow
More informationScales of Atmospheric Motion
Lecture 12 Local Wind Systems Scales of Atmospheric Motion Small turbulent eddies (swirls) A synoptic eddy 1 Coriolis Effect The larger the scale, the longer the life time. Wind shear and turbulent eddy
More informationAN EXPERIMENTAL STUDY OF WAVE FORCES ON VERTICAL BREAKWATER
Journal of Marine Science and Technology, Vol., No. 3,. -17 (7) AN EXPERIMENTAL STUDY OF WAVE FORCES ON VERTICAL BREAKWATER Yung-Fang Chiu*, Jaw-Guei Lin**, Shang-Chun Chang**, Yin-Jei Lin**, and Chia-Hsin
More information1. A tendency to roll or heel when turning (a known and typically constant disturbance) 2. Motion induced by surface waves of certain frequencies.
Department of Mechanical Engineering Massachusetts Institute of Technology 2.14 Analysis and Design of Feedback Control Systems Fall 2004 October 21, 2004 Case Study on Ship Roll Control Problem Statement:
More informationBiennial Oscillation of Tropical Ocean-Atmosphere System Associated with Indian Summer Monsoon
Biennial Oscillation of Tropical Ocean-Atmosphere System Associated with Indian Summer Monsoon 2.1 Introduction The Indian summer monsoon displays substantial interannual variability, which can have profound
More informationLecture The Oceans
Lecture 22 -- The Oceans ATMOSPHERE CIRCULATION AND WINDS Coriolis effect Prevailing winds and vertical circulation Zones of pressure, evap. & ppt. Factors modifying global winds -- Differential heating
More informationMan-made Global Warming Impossible Part 3: Arctic Warming Paradox
Man-made Global Warming Impossible Part 3: Arctic Warming Paradox By Rolf A. F. Witzsche 2013 Published by Cygni Communications Ltd. Canada Click on the images for a larger view Why are the arctic regions
More informationLecture 4: Radiative-Convective Equilibrium and Tropopause Height
Lecture 4: Radiative-Convective Equilibrium and Tropopause Height Geoff Vallis; notes by Erica Rosenblum and Ashley Payne June 19 We now consider what the effect of convection might be on all the concepts
More informationThe Boundary Layer and Related Phenomena
The Boundary Layer and Related Phenomena Jeremy A. Gibbs University of Oklahoma gibbz@ou.edu February 26, 2015 1 / 45 Overview Land/Sea Breeze Introduction Historical References Life Cycle Depiction on
More informationPHSC 3033: Meteorology Stability
PHSC 3033: Meteorology Stability Equilibrium and Stability Equilibrium s 2 States: Stable Unstable Perturbed from its initial state, an object can either tend to return to equilibrium (A. stable) or deviate
More information1 2 http://ds.data.jma.go.jp/tcc/tcc/index.html http://ds.data.jma.go.jp/tcc/tcc/index.html Climate in Japan World Climate Extratropics Tropics Oceanograhpic conditions World Climate Page 2 Extratropics
More informationSIO 210 Introduction to Physical Oceanography Mid-term examination November 4, 2013; 50 minutes
SIO 210 Introduction to Physical Oceanography Mid-term examination November 4, 2013; 50 minutes Closed book; one sheet of your own notes is allowed. A calculator is allowed. (100 total points.) Possibly
More informationMechanistic links between the tropical Atlantic and the Indian monsoon in the absence of El Nino Southern Oscillation events
Mechanistic links between the tropical Atlantic and the Indian monsoon in the absence of El Nino Southern Oscillation events Vijay Pottapinjara 1*, Roxy Mathew Koll2, Raghu Murtugudde3, Girish Kumar M
More informationOcean circulation and surface buoyancy fluxes: dynamics and energetics!
Ocean circulation and surface buoyancy fluxes: dynamics and energetics Ross Griffiths with credits: Graham Hughes, Andy Hogg, Kial Stewart, Julia Mullarney, J.Tan Research School of Earth Sciences The
More informationGoal: Develop quantitative understanding of ENSO genesis, evolution, and impacts
The Delayed Oscillator Zebiak and Cane (1987) Model Other Theories Theory of ENSO teleconnections Goal: Develop quantitative understanding of ENSO genesis, evolution, and impacts The delayed oscillator
More informationWind wave evolution in finite depth water
14 th Australasian Fluid Mechanics Conference Adelaide University, Adelaide, Australia 10-14 December 001 Wind wave evolution in finite deth water I.R. Young 1 and A.V. Babanin 1 Faculty of Engineering,
More informationWind Regimes 1. 1 Wind Regimes
Wind Regimes 1 1 Wind Regimes The proper design of a wind turbine for a site requires an accurate characterization of the wind at the site where it will operate. This requires an understanding of the sources
More informationChapter 4. Convec.on Adiaba.c lapse rate
Chapter 4 Convec.on Adiaba.c lapse rate 1.Outline: a. air parcel theory, adiabatic processes b. how do we define/determine atmospheric stability? 2.Readings: Chapter 4 VERTICAL STRUCTURE T STRATIFICATION
More informationWednesday, September 20, 2017 Reminders. Week 3 Review is now available on D2L (through Friday) Exam 1, Monday, September 25, Chapters 1-4
Wednesday, September 20, 2017 Reminders Week 3 Review is now available on D2L (through Friday) Exam 1, Monday, September 25, Chapters 1-4 PLEASE don t memorize equations, but know how to recognize them
More informationWednesday, September 15, 2010 Coriolis force, 3 dimensions (p 65)
Wednesday, September 15, 2010 Coriolis force, 3 dimensions (p 65) Weather fronts (p 63) General circulation on a rotating Earth (p 65) Geostrophy force balance (p 66) Local effects (no coriolis force)
More informationIn Search of the Source of Wind.
In Search of the Source of Wind Role of Wind in the Voyage Atmospheric Pressure The Weight of Atmospheric Air on Earth Gravitational force helps Air to remain on Earth Variations in the Atmospheric Pressure
More informationPGF. Pressure Gradient. Wind is horizontal movement of the air or other word air in motion. Forces affecting winds 2/14/2017
Winds Wind is horizontal movement of the air or other word air in motion. Forces affecting winds 1. Pressure gradient force a. High pressure flows to low pressure b. Pressure gradient = difference in pressure
More informationEffect of Orography on Land and Ocean Surface Temperature
Present and Future of Modeling Global Environmental Change: Toward Integrated Modeling, Eds., T. Matsuno and H. Kida, pp. 427 431. by TERRAPUB, 2001. Effect of Orography on Land and Ocean Surface Temperature
More informationInsolation Control of Monsoons
CHAPTER 8 Insolation Control of Monsoons Ruddiman uses correlations between monsoon history and Milankovitch orbital variations to illustrate their powerful roles in Earth s climate. Monsoon seasonally
More informationChapter 4: Moisture and Atmospheric Stability The hydrologic cycle
Chapter 4: Moisture and Atmospheric Stability The hydrologic cycle from: USGS http://water.usgs.gov/edu/watercycle.html Evaporation: enough water to cover the entire surface of Earth to 1 meter cycles
More informationThe atmospheric circulation system
The atmospheric circulation system Key questions Why does the air move? Are the movements of the winds random across the surface of the Earth, or do they follow regular patterns? What implications do these
More informationTooth Profile Design of Cycloid Gear Based on NC Forming Machining
6th International Conference on Mechatronics, Comuter and Education Informationization (MCEI 206) Tooth Profile Design of Cycloid Gear Based on NC Forming Machining Guixiang Liu, a*, Yan Cao, b, Zhou Fang,
More informationObserved Roughness Lengths for Momentum and Temperature on a Melting Glacier Surface
5 Observed Roughness Lengths for Momentum and Temperature on a Melting Glacier Surface The roughness lengths for momentum and temperature are calculated on a melting glacier surface. Data from a five level
More informationMIRAGES MONSOON. Overview. Further Reading. See also
MONSOONS / Overview 1365 Like the SAO, the theoretical understanding of the QBO is that it is forced by momentum transfer by vertically propagating waves forced in the lower atmosphere, interacting with
More informationLocal vs. Remote SST Forcing in Shaping the Asian-Australian Monsoon Variability
Local vs. Remote SST Forcing in Shaping the Asian-Australian Monsoon Variability Tim Li IPRC and Dept. of Meteorology, Univ. of Hawaii Acknowledgement. B. Wang, C.-P. Chang, P. Liu, X. Fu, Y. Zhang, Kug
More informationImpacts of intraseasonal oscillation on the onset and interannual variation of the Indian summer monsoon
Chinese Science Bulletin 2009 SCIENCE IN CHINA PRESS Springer Impacts of intraseasonal oscillation on the onset and interannual variation of the Indian summer monsoon QI YanJun 1,2,3, ZHANG RenHe 2, LI
More informationEarth and Planetary Sciences 5 Midterm Exam March 10, 2010
Earth and Planetary Sciences 5 Midterm Exam March 10, 2010 Name: Teaching Fellow: INSTRUCTIONS PUT YOUR NAME ON EACH PAGE. The exam will last 80 minutes. Complete the problems directly on the exam. Extra
More informationThe Monsoon and Its Variability Prof. Sulochana Gadgil Centre for Atmospheric & Oceanic Sciences Indian Institute of Science Bangalore
The Monsoon and Its Variability Prof. Sulochana Gadgil Centre for Atmospheric & Oceanic Sciences Indian Institute of Science Bangalore Lecture 07 The Indian Monsoon: is it a gigantic land-sea breeze? (Refer
More informationSUPPLEMENTARY INFORMATION
doi: 1.138/nature877 Background The main sis of this paper is that topography produces a strong South Asian summer monsoon primarily by insulating warm and moist air over India from cold and dry extratropics.
More informationSummary of Lecture 10, 04 March 2008 Introduce the Hadley circulation and examine global weather patterns. Discuss jet stream dynamics jet streams
Summary of Lecture 10, 04 March 2008 Introduce the Hadley circulation and examine global weather patterns. Discuss jet stream dynamics jet streams arise because the Coriolis force prevents Hadley-type
More informationPHSC 3033: Meteorology Air Forces
PHSC 3033: Meteorology Air Forces Pressure Gradient P/ d = Pressure Gradient (Change in Pressure/Distance) Horizontal Pressure Gradient Force (PGF): Force due to pressure differences, and the cause of
More informationDownslope Wind Storms
Downslope Wind Storms How does acceleration over the wing affect pressure field? Equation of Motion for frictionless flow: V t = l k α p+g If we assume a horizontally homogeneous, hydrostatic reference
More informationCEE 452/652. Week 3, Lecture 1 Mass emission rate, Atmospheric Stability. Dr. Dave DuBois Division of Atmospheric Sciences, Desert Research Institute
CEE 452/652 Week 3, Lecture 1 Mass emission rate, Atmospheric Stability Dr. Dave DuBois Division of Atmospheric Sciences, Desert Research Institute Today s topics Review homework Review quiz Mass emission
More informationDrag Reduction of Ships by Microbubbles
rag Reduction of his by Microbubbles Yoshiaki Kodama 1, kira Kakugawa 1, Takahito Takahashi 1, higeki Nagaya 1 and Takafumi Kawamura 1 National Maritime Research Institute of Jaan kodama@srimot.go.j The
More informationEnergy and mass transfer in gas-liquid reactors.
Energy and mass transfer in gas-liquid reactors. John M Smith School of Engineering (D2) University of Surrey, Guildford GU2 7XH, UK j.smith@surrey.ac.uk 1 Energy and mass transfer in gas-liquid reactors.
More informationAtmospheric Circulation
Atmospheric Circulation Why do we say Earth's temperature is moderate? It may not look like it, but various processes work to moderate Earth's temperature across the latitudes. Atmospheric circulation
More informationC.-P. Chang and Tim Li 1 Department of Meteorology, Naval Postgraduate School, Monterey, CA Abstract
TROPCAL TROPOSPHERC BENNAL OSCLLATON AND ENSO C.-P. Chang and Tim Li 1 Department of Meteorology, Naval Postgraduate School, Monterey, CA 93943 Abstract The tropospheric biennial oscillation (TBO) and
More informationAtmospheric Motions & Climate
Atmospheric Motions & Climate 20-1 Vertical Atmospheric Motion Hydrostatic Balance Non-hydrostatic Balance Science Concepts Newtonʼs Laws of Motion Vertical Forces Pressure Gradient Force Gravitational
More informationTHE ATMOSPHERE. WEATHER and CLIMATE. The Atmosphere 10/12/2018 R E M I N D E R S. PART II: People and their. weather. climate?
R E M I N D E R S Two required essays are due by Oct. 30, 2018. (A third may be used for extra credit in place of a Think Geographically essay.) ESSAY TOPICS (choose any two): Contributions of a noted
More informationAtmosphere Circulation
Atmosphere Circulation Winds What Causes Winds? Difference in air pressure due to unequal heating of the atmosphere. Temperatures vary according to the amount of sun it gets. Uneven heating of the Earth
More informationUNIFIED MECHANISM OF ENSO CONTROL ON INDIAN MONSOON RAINFALL SUNEET DWIVEDI
UNIFIED MECHANISM OF ENSO CONTROL ON INDIAN MONSOON RAINFALL SUNEET DWIVEDI K Banerjee Centre of Atmospheric and Ocean Studies, M N Saha Centre of Space Studies University of Allahabad, Allahabad, INDIA
More informationIX. Upper Ocean Circulation
IX. Upper Ocean Circulation World Ocean Covers 71% of Earth s surface Contains 97% of surface water Arctic Ocean NH: 61% ocean, 39% land Pacific Ocean Atlantic Ocean Southern Ocean Indian Ocean SH: 81%
More informationCOURSE NUMBER: ME 321 Fluid Mechanics I Fluid statics. Course teacher Dr. M. Mahbubur Razzaque Professor Department of Mechanical Engineering BUET
COURSE NUMBER: ME 321 Fluid Mechanics I Fluid statics Course teacher Dr. M. Mahbubur Razzaque Professor Department of Mechanical Engineering BUET 1 Fluid statics Fluid statics is the study of fluids in
More informationSanta Ana Winds. Surface weather map showing typical Santa Ana conditions.
Santa Ana Winds Surface weather map showing typical Santa Ana conditions. High Desert Elevation ~1500-2000 ft Santa Ana Winds ~1500 meters 0 meters Santa Ana Winds ~875 mb ~1500 meters ~875 mb Horizontal
More informationGeostrophic and Tidal Currents in the South China Sea, Area III: West Philippines
Southeast Asian Fisheries Development Center Geostrophic and Tidal Currents in the South China Sea, Area III: West Philippines Anond Snidvongs Department od Marine Science, Chulalongkorn University, Bangkok
More informationATOMOSPERIC PRESSURE, WIND & CIRCULATION
ATOMOSPERIC PRESSURE, WIND & CIRCULATION A. INTRODUCTION Important because: pressure patterns drive wind patterns which in turn drive oceanic circulation patterns o atmospheric & oceanic circulation: major
More informationTROPICAL METEOROLOGY. Intertropical Convergence Zone. Introduction. Mean Structure
TROPICAL METEOROLOGY / Intertropical Convergence Zone 1 TROPICAL METEOROLOGY 0417-P0005 0417-P0010 Intertropical Convergence Zone D E Waliser, State University of New York, Stony Brook, NY, USA Copyright
More informationThe Ocean is a Geophysical Fluid Like the Atmosphere. The Physical Ocean. Yet Not Like the Atmosphere. ATS 760 Global Carbon Cycle The Physical Ocean
The Physical Ocean The Ocean is a Geophysical Fluid Like the Atmosphere Three real forces: Gravity Pressure gradients Friction Two apparent forces: Coriolis and Centrifugal Geostrophic & Hydrostatic balances
More informationShould bonus points be included in the Six Nations Championship?
Should bonus points be included in the Six Nations Championship? Niven Winchester Joint Program on the Science and Policy of Global Change Massachusetts Institute of Technology 77 Massachusetts Avenue,
More informationLecture 7. The Indian monsoon: is it a gigantic land-sea breeze?
Lecture 7 The Indian monsoon: is it a gigantic land-sea breeze? In the next set of lectures I am going to discuss the different hypotheses put forth for the basic system responsible for the monsoon. I
More informationESS15 Lecture 12. Review, tropical oceans & El Nino, and the thermohaline ocean circulation. Please see new reading material on website.
ESS15 Lecture 12 Review, tropical oceans & El Nino, and the thermohaline ocean circulation. Please see new reading material on website. Review. I-clicker exercise: In this graph of Earth s energy imbalances
More informationThe Use of Bulk and Profile Methods for Determining Surface Heat Fluxes in the Presence of Glacier Winds
3 The Use of Bulk and Profile Methods for Determining Surface Heat Fluxes in the Presence of Glacier Winds A -D second-order closure model and in situ observations on a melting glacier surface are used
More informationWednesday, September 27, 2017 Test Monday, about half-way through grading. No D2L Assessment this week, watch for one next week
Wednesday, September 27, 2017 Test Monday, about half-way through grading No D2L Assessment this week, watch for one next week Homework 3 Climate Variability (due Monday, October 9) Quick comment on Coriolis
More information