Analysis of sensible heat flux (Qh), latent heat flux (Qe), Richardson number (Ri), bulk transport coefficient (Cd) and katabatic winds are presented by using the meteorological data in the near surface layer from an automatic weather station (AWS) in Princess Elizabeth Land, East Antarctica ice sheet and the data of corresponding period at Zhongshan station in 2002. It shows that annual mean air temperature at LGB69 is -25.6℃, which is 16.4℃ lower than that at Zhongshan, where the elevation is lower and located on the coast. The temperature lapse rate is about 1.0℃/110 m for the initial from coast to inland. The turbulence heat flux at LGB69 displays obvious seasonal variations with the average sensible heat flux -17.9 W/m2 and latent heat flux -0.9 W/m2. The intensity (Qh+Qe) of cool-ling source is -18.8 W/m2 meaning the snow surface layer obtains heat from atmosphere. The near surface atmosphere is near-neutral stratified with bulk transport coefficients (Cd) around 2.8×10-3, and it is near constant when the wind speed higher than 8 m/s. The speed and the frequency of easterly Katabatic winds at LGB69 were higher than that at Zhongshan Station.
Seasonal variations of the near surfacelayer parameters over the Antarctic ice sheet in Princess Elizabeth Land, East Antarctica
1 Chen JN, Zhang Y(1998): Characteristics of Antarctic sea ice extent and its relations to SST in the tropical pacific ocean transaction. 20(3): 134-139.
2 Xie SM, Bao CL(1996): Interaction between bipolar cold air and tropical heat air. Acta Oceanological Sinica, 18(2): 41-49.
3 Zhen QY, Wang YH(1999): Simulation of sea ice abnormal in weddle sea of Antarctica impacts on Atmospheric circulation and weather of Northeast Asia in earlier summer. Acta Oceanological Sinica, 21(2): 40-48.
4 Stearns CR, Savage M(1986): Automatic weatherstation 1980-1981 Antarctic J U S, 14(5):46-59.
5 Ian A, Morrissy JV(1983): Automatic weather stations in the Antarctic. Aust Meteorol Mag, 31: 71-76.
6 Qu SH, Shan NG(1989): Observational turbulent flux of momentum and sensible heat. Antarctic Research, 1(4): 1-11.
7 Ian A, Gerd W, Uwe R(1993): Climatology of the East Antarctic ice sheet (100°E-140°E) Derived from automatic weather stations. J Geophys Res, 98: (D5).
8 Chen YJ, Lu LH, Bian LG(1999): Weather characteristics in summer over Grover Mountain area in East Antarctic. Chinese Journal of Polar Research, 11(4): 291-300.
9 Dyer AJ, Hick BB(1970): Flux-gradient relationships in the constant flux layer.Quart J Roy Meteorol. soc, 96: 715-721. DOI:10.1002/(ISSN)1477-870X
10 Hu SL(1993): The observation and study report on marine meteorology of Chinese Seventh Antarctic Research Expedition wintering at Zhonshan station. Ocean Forecast, 10(2): 51-57.
11 Bian LG, Xue ZF, Lu CG (1998): Characteristics of climate in short term over Larssman hill. Antarctic Research, 10(1): 38-46.