R E M I N D E R S. v Two required essays are due by April 9, v Extra Credit: Think Geographically Essays from any five of the textbook s
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1 R E M I N D E R S v Two required essays are due by April 9, Ø A third may be used for extra credit in place of a Think Geographically essay. ESSAY TOPICS (choose any two): Contributions of a noted geographer, earth scientist or explorer (chapter 1) Relationship of climate change to a listed current event topic (ch. 2) Discuss a natural process that is deemed a natural hazard (ch. 3) v Extra Credit: Think Geographically Essays from any five of the textbook s chapters Last day to submit is May 14 but it is best to do them as you finish reading a chapter. Ø Any essay may be handed in before the deadline. Ø Don t wait for the night before to write them!!
2 GEOG 101 Part II People and their Physical Environment Prof. Anthony Grande Hunter College Geography Lecture design, content and presentation AFG 0319 Individual images and illustrations may be subject to prior copyright.
3 PART II: People and their Physical Environment ü I. Introduction to the Physical Environment ü II. Earth-Sun Relationship Ø III. Earth Systems A. The Hydrosphere: Oceans B. The Atmosphere: Weather and Climate C. The Lithosphere: Geologic Influences IV. Earth Habitat A. Biosphere B. Natural Controls and Cycles C. Human Impact D. Natural Hazards E. Earth Resources 3
4 HYDROSPHERE: Overview Earth is the Water Planet: 71% of surface is water and 97% of all water is in the oceans. Ocean Movements: The oceans are a dynamic system with much ac6vity and interac6ons. Water Temperature and Climate: Surface ocean temperatures affect air temperature and therefore climate. Oceans and People: Oceans play an important role in earth environment, influencing many things people do. 2 min oceans video 4
5 OCEAN BASIN TOPOGRAPHY The ocean floor is not flat! More on the ocean basin when we do the geology section. 5
6 THE DYNAMIC OCEAN The motions found in the ocean are a result of numerous aspects of fluid dynamics working together, transferring energy and creating movement. v Ocean current: a ribbon of moving water with unique characteristics. v Gyre: giant circulation system found both on the surface of the oceans and in the atmosphere linked to the earth s rotation and the Coriolis effect. v Ocean gyre: a system of circular ocean currents. v Wave: a wind-friction-generated phenomena created as wind passes over and touches the surface of water. v Tsunami: seismic sea wave created by a shock (falsely called tidal waves). v Tide: moving water bulge caused by earth's rotation and the moon s gravitational pull. 6
7 MOVEMENTS in the OCEAN v Ocean current: A ribbon of moving water with unique characteristics generated by earth's rotation and by differences in water salinity and water temperature. ü Ocean current movements are both horizontal (surface) and vertical (deep sea). v Gyre: giant circulation system linked to rotation and Coriolis. Ø Ocean gyre is a large system of circular ocean currents formed by global wind patterns, Earth's rotation and the Coriolis effect. ü Movement of the world s five ocean gyres helps drive the oceanic conveyor belt which circulates ocean water around the planet. 3 min video on ocean water salinity 7
8 MOVEMENTS in the OCEAN v Waves are generated mainly by wind-friction. ü Waves help to mix water of different temperature and salinity. ü Waves alter the coastline by erosion and deposition. v Tsunamis are seismic sea waves (falsely called tidal waves). ü They are generated by earthquakes, underwater landslides and any other shock inducer. v Tides (moving water bulges) are caused by earth's rotation and the gravitational pull of the moon. Tidal bore (a true tidal wave) is the leading edge of the incoming tide. Tidal range is the difference between high and low tide. 8
9 SURFACE OCEAN CIRCULATION KEY Currents are designated warm and cold by their source region, not their temperature. Surface currents influence climate on land through the transfer of temperature and moisture characteristics. 9
10 DEEP-SEA OCEAN CURRENTS Thermohaline circulation 3 min No sound 10
11 5. The wave swells grow in height until they reach a point beyond which they cannot support themselves and break apart forming breakers. WAVE FORMATION 1. Swells created by wind friction 7. SURF ZONE After the waves break, turbulent water (surf) runs up the shore (swash) and then flows back to the basin (backwash). 6. Wave swells 4. Maximum steepness break creating before wave breaks surf zone 3. Wave swells are affected by bottom and begin to slant shoreward 2. Open water. Orbits are circular Most waves are wind generated. Friction from the bottom of an air mass moving against the top of the water causes the water to move in orbits and pile on top of itself creating swells. ü Breaking waves in the surf zone shape the shoreline. 11
12 TSUNAMI: A shock-generated ocean wave CAUSES: Earthquake Landslide Meteor strike Sendai, Japan (2011) before and after being hit by the tsunami. v=slwzzbgh7cw earthquake tsunami 3D demo 1 min no sound v=kstqogn8dua NOAA Hawaii landslide tsunami scenario, animation, 2 min v=mdf6zelkdhk Small tsunami, Indonesia, Jan. 2018, 2 min 12
13 Tsunamis and the Ocean Floor The physics behind a tsunami wave In deep water the wave is barely noticeable. In shallow water the wave grows in height proportional to its length, similar to a flat piece of paper being pressed against a hard object. 13
14 OCEANS and PEOPLE ü Oceans help to equalize the Earth's temperature. ü They are the chief source of atmospheric moisture. ü They are an important link in the carbon/oxygen cycle. ü They are a source of food. ü They are a source of minerals. ü Their rise and fall effects coastline habitation. ü They are used for: transportation drinking water through desalinization process recreation waste disposal Plastic debris caught in gyre circulation systems. ü They are a major barrier to interaction. ü Historically ocean coasts have been the gateway to cultural interaction. 14
15 N E X T THE ATMOSPHERE: Aspects of Weather and Climate 15
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