Untersuchung der stabilen Grenzschicht (SBL) unter homogenen Bedingungen
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1 Stabile Grenzschicht über polaren Eisschilden Günther Heinemann Umweltmeteorologie Universität Trier Polare Eisschilde km Heinemann (995) Klein and Heinemann () The IGOS campaign at Summit (Greenland) ( Investigation of the Greenland boundary ayer Over Summit ) Experiment: 9 June - 5 July Untersuchung der stabilen Grenzschicht (SB) unter homogenen Bedingungen Drüe and Heinemann (7) Greenland SUMMIT station (5m) Polar at SUMMIT station Meteopod ETH 5m tower Temperature, humidity, at 8 levels Turbulence at levels Incoming and outgoing radiation fluxes at levels Meteopod Hz Heinemann Polar (AWI) Ultrasonic Anemometer
2 Neutrale Grenzschicht Stabile Grenzschicht (SB) Stabile Grenzschicht (SB) Typical flight strategy Box km x km Horizontal along- runs km constant height two series at four levels saw-tooth pattern high vertical profile flight missions in the SB (stable boundary layer) 5m mast Drüe and Heinemann (7) m mast Vertical profiles SB Drüe and Heinemann (7) Horizontal profiles at m (SB) Turbulence is intermittent Turbulent event fraction. Diamonds: IGOS cases, squares: Doran (). Radiative SB cooling (. K/h ) is significant in the SB Turbulence yields a much smaller contribution Drüe and Heinemann (7)
3 Katabatischer Wind über Eisschilden Wintertime nearsurface Greenland Constancy.8-.9 >.9 Katabatischer Wind in Grönland (Piteraq) oewe (97) oewe (97) Rasmussen (989) Orography contour interval 5 m Sample= NORAM simulations 5 km resolution m Jan 99 Heinemann and Klein () Piteraq event Tasiilaq 97: Gusts up to 7 m/s KABEG experiment April and May Polar (AWI) Kabeg flight pattern 97 K Qb Qb Synoptischer Druckgradient at in deg S A A A A Qa QaU on in deg Heinemann (999) km Katabatischer Druckgradient ΔT in C ST - - A: April mean over days (weak synoptic forcing) ΔT - Q A 5 dd time in UTC 8 5 m/s istat dd in deg Q in W/m at in deg Heinemann and Falk () Kabeg flight pattern 97 K 7.8 Qb Qb 7. A A A A Qa QaU S on in deg km Aircraft measurements of the katabatic system TP 97, 7 UTC - C 5 5 Gravity waves Rotor ice height in m Strong turbulence Windstärke 9 warm cold Ice sheet Ice sheet km5 Heinemann () in m sheinemann - (8)
4 TP 97, 7 UTC - C u in m/s PT 97 7 km at in deg Kabeg flight pattern.5.97 K Qb Qb Qb A A A A Tb Tb height in m Radar height in m u v 7. S Qa Qa U Qa on in deg Q Q 5 in m s v, in m/s Heinemann () Heinemann () Ta Ta m/s m m m m Topography (isolines every 5 m) and selected vectors at heights of,, and m above the topography for May 997 Aircraft: Regimes of the katabatic system u in m/s Hydraulic jump inear gravity waves Fr< Ice Aircraft Inland ice Fr> Downslope km Rotor Froude number θc 5 Fr = U gh θ θ Height in m w c h Fr> ice Ice sheet km Ice sheet Heinemann () Fr< Itaipu Dam (Siemens) Synoptischer Druckgradient Katabatischer Druckgradient Druckgradient-Terme und Wind aus Flugzeugmessungen acc. in m/s. - sstärke Δθ m F T F S V m in m/s Heinemann (999) 8 Katabatisch Synoptisch Δθ m in C
5 Comparisons of okalmodell simulations (.8km) and aircraft measurements KABEG TKE bias (-5m) for all KABEG profiles in the katabatic SB e bias in m²/s² 8 BIAS M standard Diag. Prog. Asympthotic mixing length in m Measurements Nach Krebsbach () Simulation der Schneedrift mit M/SNOWPACK Acc Snow drift S r = r ( v S ) H d accumulation by snow drift (kg/m²) M+SNOWPACK - July (IGOS) Hebbinghaus and Heinemann () a) ocal scaling for KABEG data 5 b) KABEG z/λ rametrisierung der SB σ a * a Heinemann () Variances vertical (about 5 data points, flights) = C$ = const for z / Λ > Cabauw data, Nieuwstadt (98) Data collected within 8 months (data from Duynkerke, ) a 7 Katabatischer Wind Antarktis Profile of the poleward mass flux across the grounding line Van ipzig and van den Broeke () RACMO 55 km winter months JJA Van ipzig () Wintertime near-surface Antarctica z/λ z/λ Orography contour interval m Sample= RACMO 55km (957-) Annual average sublimation (-E in mm/a) Schlussfolgerungen Die polaren Eisschilde eignen sich sehr gut zur Untersuchung: - der sehr stabilen Grenzschicht mit intermittierender Turbulenz - der stabilen Grenzschicht mit voll ausgebildeter Turbulenz (katabatischer Wind) katabatischer Wind bedeutsam für Massenbilanz der Eisschilde und für den globalen Impulshaushalt Van den Broeke (5)
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