A precise monitoring of snow surface height in the region of Lambert Glacier basin-Amery Ice Shelf, East Antarctica

• Published in: Science in China Series D: Earth Sciences
• Main Authors: Xiao, CD, Qin, DH, Bian, LG, Zhou, XJ, Allison, I, Yan, M
• Other Authors: Xiao, CD (reprint author), Peking Univ, Dept Atmospher Sci, Beijing 100871, Peoples R China., Peking Univ, Dept Atmospher Sci, Beijing 100871, Peoples R China., Chinese Acad Meteorol Sci, Beijing 100081, Peoples R China., Chinese Acad Sci, Lab Ice Core & Cold Reg Environm, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China., Australian Antarctic Div, Hobart, Tas 7001, Australia., Antarctic Climate & Ecosyst CRC, Hobart, Tas 7001, Australia., Polar Res Ctr China, Shanghai 200129, Peoples R China.
• Format: Journal/Newspaper
• Language: English
• Published: science in china series d earth sciences 2005
• Subjects: Antarctica; Lambert Glacier Basin; Amery Ice Shelf; accumulation; katabatic wind; DRONNING MAUD LAND; POLAR PLATEAU; MASS-BALANCE; SHEET; SUBLIMATION; STATION; Amery; Antarctic; Davis Station; Davis-Station; Dronning Maud Land; East Antarctica; Lambert Glacier; Polar Plateau; The Antarctic; Antarc*; Ice Sheet; Ice Shelf
• Online Access: https://hdl.handle.net/20.500.11897/254209; https://doi.org/10.1360/03yd0127

The net surface snow accumulation on the Antarctic ice sheet is determined by a combination of precipitation, sublimation and wind redistribution. We present a one-year record of hourly snow-height measurements at LGB69 (70 degrees 50'S, 77 degrees 04'E, 1850 m a.s.l.), east side of Lambert Glacier basin (LGB), and 4 year record at G3 (70 degrees 53'S, 69 degrees 52'E, 84 m a.s.l.), Amery Ice Shelf (AIS). The measurements were made with ultrasonic sensors mounted on automatic weather stations installed at two sites. The snow accumulation at LGB69 is approximately 70 cm. Throughout the winter, between April and September, there was little change in surface snow height (SSH) at the two sites. The negative SSH change is due to densification at LGB69, and is due to both ablation and densification at G3. The strongest accumulation at two sites occurred during the period between October and March (accounting for 101.6% at LG1369), with four episodic increasing events occurring during 2002 for LGB69, and eight events during 1999-2002 for G3 (2 to 3 events per year). At LG1369, these episodic events coincided with obvious humidity "pulses" and decreases of incoming solar radiation as recorded by the AWS. Observations of the total cloud amount at Davis station, 160 km NNE of LGB69, showed good correlation with major accumulation events recorded at LGB69. There was an obvious anti-correlation between the lowest cloud height at Davis and the daily accumulation rate at LG1369. Although there was no correlation over the total year between wind speed and accumulation at LG1369, large individual accumulation events are associated with episodes of strong wind (> 7 m/s), we estimate drift snow may contribute to total SSH up to 35%. Strong accumulation events at LGB69 are associated with major storms in the region and inland transport of moist air masses from the coast. Geosciences, Multidisciplinary SCI(E) EI 9 ARTICLE 1 100-111 48