An inter-comparison of Arctic synoptic scale storms between four global reanalysis datasets
An inter-comparison of Arctic synoptic scale storms between four global reanalysis datasets
复制标题
四个全球再分析数据集之间北极天气尺度风暴的相互比较
作者：
Alexander F. Vessey;K. Hodges;L. Shaffrey;J. Day
随着海冰面积持续减少，北极变得越来越容易接近，导致人类更容易受到北极风暴的影响。该研究比较了1980年至2017年冬季（DJF）和夏季（JJA）的ECMWF-Interim Reanalysis，55年日本再分析，NASA-Modern Era Retrospective Analysis for Research and Applications Version 2和国家环境预测-气候预报系统再分析中心数据集之间的北极风暴特征。结果表明，北极风暴特征是敏感的变量用于风暴跟踪。利用海平面气压极小值跟踪北极风暴时，发现夏季和冬季北极风暴频率相似，而利用850 hPa相对涡度跟踪北极风暴时，发现冬季北极风暴频率高于夏季。研究还发现，1980年至2017年期间，北极风暴特征没有显著趋势。鉴于北极观测的稀疏性，可以预期再分析数据集之间的北极风暴特征存在很大差异。虽然，一些相似的北极风暴特征之间的再分析数据集，发现北极风暴特征之间的差异，一般是在冬季比夏季更高。总体而言，结果表明，在再分析数据集之间的北极风暴特征存在差异，但使用850 hPa相对涡度或平均海平面压力作为风暴跟踪变量之间可能会出现更大的差异，这增加了与当前北极风暴特征相关的不确定性。
The Arctic is becoming more accessible as sea ice extent continues to decline, resulting in higher human exposure to Arctic storms. This study compares Arctic storm characteristics between the ECMWF-Interim Reanalysis, 55-year Japanese Reanalysis, NASA-Modern Era Retrospective Analysis for Research and Applications Version 2 and National Centre for Environmental Prediction-Climate Forecast System Reanalysis datasets between 1980 and 2017, in winter (DJF) and summer (JJA). It is shown that Arctic storm characteristics are sensitive to the variable used for storm tracking. Arctic storm frequency is found to be similar in summer and winter when using sea level pressure minima to track Arctic storms, whereas, the storm frequency is found to be higher in winter than summer when using 850 hPa relative vorticity to track storms, based on using the same storm tracking algorithm. It is also found that there are no significant trends in Arctic storm characteristics between 1980 and 2017. Given the sparsity of observations in the Arctic, it might be expected that there are large differences in Arctic storm characteristics between the reanalysis datasets. Though, some similar Arctic storm characteristics are found between the reanalysis datasets, it is found that the differences in Arctic storm characteristics between the reanalysis datasets are generally higher in winter than in summer. Overall, the results show that there are differences in Arctic storm characteristics between reanalysis datasets, but even larger differences can arise between using 850 hPa relative vorticity or mean sea level pressure as the storm tracking variable, which adds to the uncertainty associated with current Arctic storm characteristics.
影响因子：
8
作者：
U. Neu;M. G. Akperov;Nina Bellenbaum;R. Benestad;R. Blender;R. Caballero;A. Cocozza;H. Dacre;Yang Feng;K. Fraedrich;J. Grieger;S. Gulev;J. Hanley;T. Hewson;M. Inatsu;K. Keay;S. Kew;I. Kindem;G. Leckebusch;M. Liberato;P. Lionello;I. Mokhov;J. Pinto;C. Raible;M. Reale;I. Rudeva;M. Schuster;I. Simmonds;M. Sinclair;M. Sprenger;N. Tilinina;I. Trigo;S. Ulbrich;U. Ulbrich;Xiaolan L. Wang;H. Wernli
通讯作者：
U. Neu;M. G. Akperov;Nina Bellenbaum;R. Benestad;R. Blender;R. Caballero;A. Cocozza;H. Dacre;Yang Feng;K. Fraedrich;J. Grieger;S. Gulev;J. Hanley;T. Hewson;M. Inatsu;K. Keay;S. Kew;I. Kindem;G. Leckebusch;M. Liberato;P. Lionello;I. Mokhov;J. Pinto;C. Raible;M. Reale;I. Rudeva;M. Schuster;I. Simmonds;M. Sinclair;M. Sprenger;N. Tilinina;I. Trigo;S. Ulbrich;U. Ulbrich;Xiaolan L. Wang;H. Wernli