Explosive Cyclogenesis: A Global Climatology Comparing Multiple Reanalyses
Explosive Cyclogenesis: A Global Climatology Comparing Multiple Reanalyses
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DOI：
10.1175/2010jcli3437.1
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发表时间：
2010-12
影响因子：
4.9
通讯作者：
J. Allen;A. Pezza;M. Black
中科院分区：
文献类型：
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作者：
J. Allen;A. Pezza;M. Black
根据NCEP第二次再分析（NCEP 2）、日本25年再分析（JRA-25）和ECMWFreanalyses 1979 - 2008年的资料，提出了一个快速气旋增强的全球气候学特征。合并后的定义被发现显着改变了爆炸性气旋的数量，减少了“人工”系统，发现这些系统占早期定义所确定的数量的20%。从季节上看，冬季是南北半球大气环流的主要形成期，南半球的年际变率较低，南北半球自然年际变率之外的系统频率变化不大。在北方半球（NH），爆发性气旋在空间上分布于几个不同的区域，其中北半球有西北太平洋和北大西洋两个区域，而南半球有三个主要区域。还发现高分辨率和现代再分析数据增加了快速增强系统的气候学人口。这表明，随着时间的推移，再分析的一致性明显得到了越来越多的改善，特别是在SH。
A global climatology for rapid cyclone intensification has been produced from the second NCEP reanalysis (NCEP2),the25-yrJapaneseReanalysis(JRA-25),andtheECMWFreanalysesovertheperiod1979‐2008.An improved (combined) criterion for identifying explosive cyclones has been developed based on preexisting definitions, offering a more balanced, normalized climatological distribution. The combined definition was found to significantly alter the population of explosive cyclones, with a reduction in ‘‘artificial’’ systems, which are found to compose 20% of the population determined by earlier definitions. Seasonally, winter was found to be the dominant formative period in both hemispheres, with a lower degree of interseasonal variability in the SouthernHemisphere(SH).Consideredovertheperiod1979‐2008,littlechangeisobservedinthefrequencyof systems outside of natural interannual variability in either hemisphere. Significant statistical differences have been found between reanalyses in the SH, while in contrast the Northern Hemisphere (NH) was characterized bystrongpositivecorrelationsbetweenreanalysesinalmostallexaminedcases.Spatially,explosivecyclonesare distributed into several distinct regions, with two regions in the northwest Pacific and the North Atlantic in the NH and three main regions in the SH. High-resolution and modern reanalysis data were also found to increase the climatology population of rapidly intensifying systems. This indicates that the reanalyses have apparently undergone increasing improvements in consistency over time, particularly in the SH.