Robustness of the Recent Global Atmospheric Reanalyses for Antarctic Near-Surface Wind Speed Climatology
Robustness of the Recent Global Atmospheric Reanalyses for Antarctic Near-Surface Wind Speed Climatology
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DOI：
10.1175/jcli-d-19-0648.1
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发表时间：
2020-05-01
影响因子：
4.9
通讯作者：
Zhang, Yulun
中科院分区：
文献类型：
--
作者：
Dong, Xu;Wang, Yetang;Zhang, Yulun
来自南极冰盖上空30个人工气象站和26个自动气象站的近地面风速观测数据被用来检验六个最近全球再分析产品中风速气候学的稳健性：现代研究和应用回顾分析，第2版（MERRA-2），日本气象厅55年再分析（JRA-55），气候预报系统再分析（CFSR）、国家环境预报中心-美国能源部（DOE）再分析2（NCEP 2）、欧洲中期天气预报中心（ECMWF）中期再分析（ERA-Interim）和第五代再分析（ERA 5）。它们表示近地表风速的技能随季节而变化，夏季的表现比冬季更好。在区域尺度上，所有的再分析数据集表现更差的幅度，但更好地为他们的逐年变化的风制度在悬崖比沿海和高原地区。相比之下，ERA 5在1979年以后的月平均风速量级和近地面风速的年际变化方面表现最好。尽管不同再分析之间存在一些区域性差异，但相互比较在重叠时间跨度（1980-2018年）期间不同数据集的年度和季节风速全舌平均值具有高度和显著的相关性。此外，所有的再分析都显示了1980-2018年期间年和夏季风速的正趋势，这与南环模态的正极性有关。
Near-surface wind speed observations from 30 manned meteorological stations and 26 automatic weather stations over the Antarctic Ice Sheet are used to examine the robustness of wind speed climatology in six recent global reanalysis products: the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2), the Japan Meteorological Agency 55-Year Reanalysis (JRA-55), the Climate Forecast System Reanalysis (CFSR), the National Centers for Environmental Prediction-U.S. Department of Energy (DOE) Reanalysis 2 (NCEP2), and the European Centre for Medium-Range Weather Forecasts (ECMWF) interim reanalysis (ERA-Interim) and fifth-generation reanalysis (ERA5). Their skills for representing near-surface wind speeds vary by season, with better performance in summer than in winter. At the regional scale, all reanalysis datasets perform more poorly for the magnitude, but better for their year-to-year changes in wind regimes in the escarpment than the coastal and plateau regions. By comparison, ERA5 has the best performance for the monthly averaged wind speed magnitude and the interannual variability of the near-surface wind speed from 1979 onward. Intercomparison exhibits high and significant correlations for annual and seasonal wind speed Antarctic-wide averages from different datasets during their overlapping timespans (1980-2018), despite some regional disagreements between the different reanalyses. Furthermore, all of the reanalyses show positive trends of the annual and summer wind speeds for the 1980-2018 period, which are linked with positive polarity of the southern annular mode.