Lowest temperature and snow accumulation rate are preconditions for retrieving the oldest ice core from the polar ice sheets. The 10-m depth firn temperature at Dome A, the summit of the Antarctic Ice Sheet, recorded by an automatic weather station (AWS) was -58.3℃ in 2005 and -58.2℃ in 2006, re-spectively. The 10-m firn temperature is an approximation of the annual mean air temperature (AMAT), and this is the lowest AMAT that has been recorded on the surface of the Earth. The stable isotopic ratios (δ 18O ...
【英文摘要】
Lowest temperature and snow accumulation rate are preconditions for retrieving the oldest ice core from the polar ice sheets. The 10-m depth firn temperature at Dome A, the summit of the Antarctic Ice Sheet, recorded by an automatic weather station (AWS) was -58.3℃ in 2005 and -58.2℃ in 2006, re-spectively. The 10-m firn temperature is an approximation of the annual mean air temperature (AMAT), and this is the lowest AMAT that has been recorded on the surface of the Earth. The stable isotopic ratios (δ 18O ...
【基金】
the National Natural Science Foundation of China (Grant Nos. 40620120112 and 40776002);
Chinese Academy of Sciences (Grant No. KZCX-SW-354);
the Hundred-Talent Project of Chinese Academy of Sciences
【更新日期】
2008-03-06
【分类号】
P343.6
【正文快照】
Determination of the site that has the lowest temperature and lowest snow accumulation in the polar ice sheets has high scientific significance due to the two major rea- sons: (1) Recovery of paleoclimatic records older than 1 Ma from ice cores has long b
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