On the performance of twentieth century reanalysis products for Antarctic snow accumulation

On the performance of twentieth century reanalysis products for Antarctic snow accumulation
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二十世纪南极积雪再分析产品的性能研究

DOI:
10.1007/s00382-019-05008-4
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发表时间:
2019-10
期刊:
影响因子:
4.6
通讯作者:
Sun Weijun
Sun Weijun
中科院分区:
地球科学2区
文献类型:
--
作者:
Wang Yetang;Hou Shugui;Ding Minghu;Sun Weijun

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20世纪再分析(20 CR)、20世纪试验再分析(ERA-20 C)、20世纪气候再分析产品的优点和缺点(CERA-20 C),以及十个二十世纪大气模型集成的集合(ERA-20 CM),根据3265个南极多-年平均表面质量平衡观测和79个冰芯雪积累时间序列,提供了一个独立的估计,因为它们没有同化到再分析,不用于强迫ERA-20 CM。ECMWF“Interim”再分析(ERA-Interim)和两个区域气候模式(RACMO 2和MAR)也被用作补充分析。尽管模拟和观测之间的幅度差异,多年平均积雪观测的大尺度空间变异性相当好地再现了所有的二十世纪的数据集。这四个数据集捕获了1901年至2010年南极半岛冰芯雪积累复合物年际变化的很大一部分(> 40%)。然而,没有一个世纪的数据集能够单独解释20世纪世纪期间南极其他地区冰芯记录中> 20%的方差。即使是现代卫星时代(从1979年起),他们的南极积雪的表现仍然较差,相对于ERA-Interim,RACMO 2和MAR。相当大的不均匀性和虚假的变化,在大气环流中发现这些数据集,因此降水减去蒸发/升华(P-E)的变化和趋势在过去的100年中,主要是人为的南极洲。
The strengths and weakness of the Twentieth-Century Reanalysis (20CR), the Pilot reanalysis of the twentieth-century (ERA-20C), a coupled twentieth-century climate reanalysis product (CERA-20C), and an ensemble of ten twentieth-century atmospheric model integrations (ERA-20CM), are examined for Antarctic snow accumulation based on 3265 Antarctic multi-year averaged surface mass balance observations and 79 ice core snow accumulation time series, which provides an independent estimate because they are not assimilated into the reanalyses and not used to force ERA-20CM. The ECMWF “Interim” reanalysis (ERA-Interim) and two regional climate models (RACMO2 and MAR) are also used as a complementary analysis. Despite the magnitude discrepancy between simulations and observations, large-scale spatial variability in multi-year averaged snow accumulation observations are reasonably well reproduced by all the twentieth century datasets. The four datasets capture a large fraction (> 40%) of the interannual variability in the ice core snow accumulation composite over the Antarctic Peninsula from 1901 to 2010. However, none of the twentieth century datasets alone is able to explain > 20% of variance in ice core records at the other Antarctic regions during the twentieth century. Even for the modern satellite era (from 1979 onwards), their performance for Antarctic snow accumulation is still poorer, relative to ERA-Interim, RACMO2 and MAR. Considerable inhomogeneities and spurious changes in atmospheric circulation are found in these datasets, and thus the precipitation minus evaporation/sublimation (P–E) changes and trends during the past 100 years are largely artificial over Antarctica.
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