Stable isotopes in daily precipitation at Dome Fuji, East Antarctica
Stable isotopes in daily precipitation at Dome Fuji, East Antarctica
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DOI：
10.1029/2006gl026936
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发表时间：
2006-09
影响因子：
5.2
通讯作者：
K. Fujita;O. Abe
中科院分区：
文献类型：
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作者：
K. Fujita;O. Abe
用于稳定同位素分析的日降水样本是2003年全年在东南极内陆的圆顶富士站采集的。稳定同位素显示出明显的枯竭值，具有很大的季节性变化，这是从未获得的。δ-T关系和d过剩的时间变化与地理分布一致。虽然降水量很小(27.6毫米水当量(W.E.))，但几乎每天都有降雨量。年总量和0.08毫米W.E.日平均数)。年降水量的一半是由11个事件(18天)累积的，没有季节性。由于降水事件发生在较温暖的环境中，与同位素直接相关的降水加权温度明显高于通常用作同位素温度计的年平均地表温度。这项研究为了解现今南极内陆降水的季节性及其同位素组成提供了重要信息。
Daily precipitation samples for stable isotope analysis were collected throughout 2003 at Dome Fuji Station, inland East Antarctica. Stable isotopes show significantly depleted values with a large seasonal variability, which have never been obtained. Temporal changes in δ‐T relation and d‐excess are consistent with those found in geographical distribution. Precipitation was obtained almost everyday, though the amounts were quite small (27.6 mm water equivalent (w.e.) annual total and 0.08 mm w.e. daily average). Half of the annual precipitation was accumulated by only 11 events (18 days) without seasonality. Since the precipitation events occurred under warmer circumstances, the precipitation‐weighted temperature, which should be related directly to the isotopes, was significantly warmer than the mean annual surface temperature, which has usually been adopted as isotopic thermometer. This study provides significant information to understand present‐day seasonality of precipitation and its isotopic composition in inland Antarctica.