Features of meteorological events preserved in a high-resolution Law Dome (East Antarctica) snow pit
Features of meteorological events preserved in a high-resolution Law Dome (East Antarctica) snow pit
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DOI：
10.3189/172756402781816780
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发表时间：
2002
影响因子：
2.9
通讯作者：
Alison Mcmorrow;M. Curran;T. V. van Ommen;V. Morgan;I. Allison
中科院分区：
文献类型：
--
作者：
Alison Mcmorrow;M. Curran;T. V. van Ommen;V. Morgan;I. Allison
摘要在东南极洛穹高积累区获得了氧同位素比值（δ 18 O）和痕量离子形态的雪坑和浅雪芯记录。在长达7.7公里的记录中确定的累积事件之间的一致性部分证实，所观察到的冰川化学变化是区域而不是局部表面效应的结果。这样就可以用测得的气象参数校准雪坑记录。净积累期，包括雪坑记录确定使用每小时积雪积累测量从一个共同定位的自动气象站（AWS）。特别关注的是在1999年至2000年的夏季，对应于顶部0.5米的雪坑保存的三个净积累期。当地的气象条件记录在夏季积累期间的AWS与区域和天气尺度气象来自凯西站（110公里以外）和高级甚高分辨率辐射计卫星图像，以确定潜在的源区保存在夏季雪中的化学信号在法律圆顶。
Abstract Snow-pit and shallow firn-core records of oxygen isotope ratios (δ18O) and trace ion species were generated at a high-accumulation site on Law Dome, East Antarctica. Concordance between accumulation events identified in records up to 7.7 km a part confirms that the observed glaciochemical variations are the result of regional rather than local surface effects. This allows calibration of the snow-pit records with measured meteorological parameters. Net accumulation periods that comprise the snow-pit record are identified using hourly snow-accumulation measurements from a co-located automatic weather station (AWS). Particular focus is given to three net accumulation periods preserved during austral summer 1999/2000 that correspond to the top 0.5 m of the snow pit. Local meteorological conditions recorded during the summer accumulation periods by the AWS are combined with regional and synoptic-scale meteorology derived from Casey station (110 km away) and Advanced Very High Resolution Radiometer satellite imagery to identify potential source regions for chemical signals preserved in summer snow at Law Dome.