Antarctic 20th Century Accumulation Changes Based on Regional Climate Model Simulations

Antarctic 20th Century Accumulation Changes Based on Regional Climate Model Simulations
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基于区域气候模型模拟的南极20世纪累积变化

DOI:
10.1155/2010/327172
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发表时间:
2010
影响因子:
2.9
通讯作者:
D. Handorf
D. Handorf
中科院分区:
地球科学4区
文献类型:
--
作者:
Dethloff;K. Glushak;A. Rinke;D. Handorf

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区域气候模式HIRHAM已在1958-1998年欧洲再分析资料ERA - 40的横向和下边界驱动下应用于南极洲。以50公里的水平分辨率进行了40年的模拟,提供了南极大气环流、天气尺度压力系统和降水-升华(P - E)结构的空间分布的真实模拟。模拟的P - E模式在质量上与冰川学估计一致。估算的(P - E)趋势表明,南极西部海岸的地表物质积累增加,而东南极洲部分地区则减少。基于ERA - 40资料和HIRHAM模拟,研究了南极涛动(AAO)对南极近地表气候和地表物质积累的影响。结果表明,区域累积变化在很大程度上是由南极海岸周边AAO期相变化引起的瞬态活动变化驱动的。在正AAO期间,更多的瞬态压力系统向大陆移动,南极洲西部和南极洲东南部的部分地区获得更多的降水和质量。在南极洲中部,盛行的反气旋导致极地沙漠化的加强,这与东南极洲北部地表物质平衡的减少有关。
The regional climate model HIRHAM has been applied to Antarctica driven at the lateral and lower boundaries by European Reanalysis data ERA‐40 for the period 1958–1998. Simulations over 4 decades, carried out with a horizontal resolution of 50 km, deliver a realistic simulation of the Antarctic atmospheric circulation, synoptic‐scale pressure systems, and the spatial distribution of precipitation minus sublimation (P‐E) structures. The simulated P‐E pattern is in qualitative agreement with glaciological estimates. The estimated (P‐E) trends demonstrate surfacemass accumulation increase at the West Antarctic coasts and reductions in parts of East Antarctica. The influence of the Antarctic Oscillation (AAO) on the near‐surface climate and the surface mass accumulation over Antarctica have been investigated on the basis of ERA‐40 data and HIRHAM simulations. It is shown that the regional accumulation changes are largely driven by changes in the transient activity around the Antarctic coasts due to the varying AAO phases. During positive AAO, more transient pressure systems travelling towards the continent, and Western Antarctica and parts of South‐Eastern Antarctica gain more precipitation and mass. Over central Antarctica the prevailing anticyclone causes a strengthening of polar desertification connected with a reduced surface mass balance in the northern part of East Antarctica.
未来气候预测下的大气遥相关和流动状况
DOI: --
发表时间: 2009
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发表时间: 2004
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