Climatology and recent increase of westerly winds over the Amundsen Sea derived from six reanalyses
Climatology and recent increase of westerly winds over the Amundsen Sea derived from six reanalyses
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根据六次重新分析得出的气候学和最近阿蒙森海西风的增加
DOI：
10.1002/joc.3473
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Bracegirdle T
中科院分区：
文献类型：
--
作者：
Bracegirdle T
据估计，从南极洲西部到阿蒙森海的冰川加速对目前海平面上升的贡献为6%，估计有可能使全球海平面增加0.24米。阿蒙森海上空较强的西风可以增加相对温暖的海水流向冰架底部，这些冰架从冰川流入阿蒙森海。这种变暖导致的冰川变薄是推动所观察到的冰川加速的一个潜在重要因素。然而，由于缺乏现场观测的长期记录，该地区的风的气候学尚未得到广泛的研究。在这里，六个不同的再分析数据集（CFSR，ERA-40，ERA-临时，JRA-25，MERRA和NNR 1）进行评估，以确定自1979年以来的变异性和变化的最佳估计，当时从卫星上广泛监测大气。与来自冰漂流浮标的独立平均海平面压力数据的比较表明，ERA-Interim在捕获邻近别林斯高晋海的单个天气系统的细节方面显然是最准确的，这意味着它在阿蒙森海也是准确的。在气候学意义上，最近产生的五个再分析数据集（2000年以后）只有很小的差异。西风的十年变化与观测到的南环模态（SAM）指数的增加一致，是整个再分析数据集的一个一致特征。特别是，强烈的季节性依赖的SAM（即在夏季和秋季在最近几十年的显着的积极趋势）的观察趋势也被认为是在阿蒙森海的西风强度。在年际变化方面，阿蒙森海的年平均西风与夏季的SAM（r = 0.35; p≤0.05）和春季（9 - 11月）的El Nino-Southern Oscillation（r = 0.41; p≤0.05）显著相关。
The observed acceleration of glaciers from West Antarctica into the Amundsen Sea is estimated to be contributing 6% to current sea-level rise with the estimated potential to add 0.24 m to global sea level. Stronger westerly winds over the Amundsen Sea can increase the flow of relatively warm ocean water to the base of ice shelves that flow from glaciers into the Amundsen Sea. Thinning of the glaciers caused by this warming is a potentially important factor in driving the observed acceleration of glaciers. However, the climatology of winds in the region has not been extensively studied due to a lack of in situ observational long-term records. Here six different reanalysis datasets are assessed (CFSR, ERA-40, ERA-Interim, JRA-25, MERRA and NNR1) to determine a best estimate of variability and change since 1979 when the widespread monitoring of the atmosphere from satellites was introduced. A comparison with independent mean sea-level pressure data from ice drifting buoys shows that ERA-Interim is clearly the most accurate at capturing the details of individual weather systems over the neighbouring Bellingshausen Sea, implying that it is also accurate over the Amundsen Sea. In terms of climatological means, the five recently-produced (after ∼2000) reanalysis datasets show only small differences. Decadal variations of westerly winds congruent with the observed increases in the southern annular mode (SAM) index are a consistent feature across the reanalysis datasets. In particular, the strong seasonal dependence of observed trends in the SAM (i.e. significant positive trends in the summer and autumn in recent decades) is also seen in the strength of westerly winds over the Amundsen Sea. In terms of year-to-year variability, the annual mean westerly winds over the Amundsen Sea were found to be significantly correlated with the SAM in summer (r = 0.35; p≤0.05) and El Nino-Southern Oscillation in spring (September to November) (r = 0.41; p≤0.05).
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影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik
影响因子：
2.2
作者：
M. Sakamoto;J. Christy
通讯作者：
M. Sakamoto;J. Christy
影响因子：
8
作者：
Saha, Suranjana;Moorthi, Shrinivas;Goldberg, Mitch
通讯作者：
Goldberg, Mitch
西南极洲松岛冰川内陆变薄。
影响因子：
56.9
作者：
A. Shepherd;D. Wingham;Justin A. D. Mansley;H. Corr
通讯作者：
H. Corr
2002年南极冬季气象分析的诊断比较
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
G. Manney;D. Allen;K. Krüger;Barbara Naujokat;M. Santee;J. L. Sabutis;S. Pawson;R. Swinbank;C. Randall;A. Simmons;C. Long
通讯作者：
C. Long