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Atmospheric boundary layer research at Halley, Antarctica Phil S. Anderson Russ Ladkin

Atmospheric boundary layer research at Halley, Antarctica Phil S. Anderson Russ Ladkin John C. King British Antarctic Survey Natural Environment Research Council Cambridge, UK j.c.king@bas.ac.uk. Why study the ABL in Antarctica ?. Boundary-layer processes exert strong control over

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Atmospheric boundary layer research at Halley, Antarctica Phil S. Anderson Russ Ladkin

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  1. Atmospheric boundary layer research at Halley, Antarctica Phil S. Anderson Russ Ladkin John C. King British Antarctic Survey Natural Environment Research Council Cambridge, UK j.c.king@bas.ac.uk

  2. Why study the ABL in Antarctica ? • Boundary-layer processes exert strong controlover • SH high latitude circulation, driving the katabatic • circulation. • Boundary-layer parametrisations currently used in • GCMs may not be appropriate for Antarctic conditions • Antarctica offers some near-ideal sites for SBL studies: • - little or no diurnal variation • - strong stability • - uniform, flat and unobstructed sites • Turbulent transport is a key part of air-snow exchange

  3. Halley Research Station • 75oS, 26oW, 30 m.a.s.l. • Brunt Ice Shelf - flat, uniform, unobstructed • Prevailing easterlies have > 50 km fetch • 3 months of winter darkness • Synoptic and upper-air station (WMO 89022)

  4. History of boundary-layer studies at Halley (1) 1986: Stable Antarctic Boundary Layer Expt. (STABLE) 10-min eddy-correlation fluxes from sonic anemometers at 5, 15, 30m Profiles of mean wind and temperature to 30m Sodar 1991: STABLE-II As STABLE, plus: Microbarograph array Blowing snow measurements

  5. History of boundary-layer studies at Halley (2) 1995 - 2000 FLUX/Polar Snow 10-min eddy correlation fluxes at 4m Limited profile to 10 m Snow surface and snowpack temperatures Solar and terrestrial radiation Sodar Tethersonde profiling 1995 - ? Katabatic wind studies AWS network up continental slope inland from Halley Autonomous doppler sodar deployed 2002

  6. 100 km 100 m contours

  7. Autonomous Doppler Sodar system

  8. Planned measurements at Halley, 2002-2005 • Turbulence • Metek sonic anemometers at 4, 15, 30m • Sampling at 40Hz, recorded continuously at 10Hz • 2 additional Meteks at 10m on remote masts • Applied Technologies M100 infrared hygrometer for • fast-response water vapour measurement

  9. Planned measurements at Halley, 2002-2005 • Mean profiles • Vaisala HMP35 (Temperature/humidity) in aspirated • radiation shields at 1, 2, 4, 8, 15 and 30m • RM Young propellor/vane Wind Monitor at 1, 2, 4, 8, • 15 and 30m • Cooled-mirror frost point hygrometer (Michell • Dewmet) for accurate humidity measurement • Record 10-minute means

  10. Planned measurements at Halley, 2002-2005 • Radiation and snow temperature • Global, diffuse and reflected shortwave (Kipp & • Zonen solarimeters, aspirated and heated) • Downwelling and upwelling longwave (Kipp & Zonen • pyrgeometers, aspirated and heated) • Didcot Instruments net radiometer • 2 x Heitronics infrared thermometers for snow • surface temperature • Snow temperature profile to 10m depth • Record 10 minute means

  11. Planned measurements at Halley, 2002-2005 • Other measurements • Microbarograph array • Sodar array • Kite / helikite tethersonde for measuring temperature, • humidity and wind profiles to ~ 500m. Usually used • during limited, intensive campaigns • Routine daily (1200 UTC) launch of Vaisala • radiosonde with GPS windfinding. Sounding to • ~100 hPa. Fine structure data retained. • (contact BAS Meteorological and Ozone Monitoring • Unit for data)

  12. Further information • Bibliography – please take one • Science queries to John King or Phil Anderson • Technical queries on instruments to Russ Ladkin

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