Historical analogues of the 2008 extreme snow event over Central and Southern China

Historical analogues of the 2008 extreme snow event over Central and Southern China
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2008年中南地区特大雪灾的历史类比

DOI:
10.3354/cr01052
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发表时间:
2011-01-01
期刊:
影响因子:
1.1
通讯作者:
Wang, Wei-Chyung
Wang, Wei-Chyung
中科院分区:
地球科学4区
文献类型:
--
作者:
Hao, Zhixin;Zheng, Jingyun;Wang, Wei-Chyung

文献摘要

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我们使用的天气记录包含在中国历史文献中,从过去的500年来搜索极端降雪事件(ESEs)的严重程度相媲美的事件在2008年初,当中国中部和南部经历了持续的大雪,异常低温。根据降雪的地理覆盖范围,可以将ESE分为3组,使用以下标准来定义ESE:>15个降雪日,20个积雪/结冰日,以及单个冬季的累积积雪总深度为30 cm。第一组覆盖整个华东地区(东经105°以东),ESE发生在1654年,1660年,1665年,1670年,1676年,1683年,1689年,1690年,1700年,1714年,1719年,1830−32年,1840年,1877年和1892年;第二组主要分布在淮河以南(~33° N),分别发生在1694、1887、1929和1930年;第三类局限于黄河与南岭之间的中部地区(大约26°到35° N),而ESE发生在1578年,1620年,1796年和1841年。我们还研究了ESE发生和温度制度之间的关系,在500年的时间。根据1871年以来的世纪全球大气环流再分析资料,我们发现ESE与500 hPa位势高度异常有密切的联系。这项研究提供了极端冬季降雪的情况下,由于全球大气环流的自然变化,可用于古气候模拟,并提供线索,了解未来的极端在中国。
We used weather records contained in Chinese historical documents from the past 500 yr to search for extreme snow events (ESEs) that were comparable in severity to an event in early 2008, when Central and Southern China experienced persistent heavy snowfall with unusually low temperatures. ESEs can be divided into 3 groups according to the geographical coverage of snowfall, using the following criteria to define an ESE: >15 snowfall days, 20 snow-cover/icing days, and 30 cm total cumulated snow depth for an individual winter. The first group covers the whole of Eastern China (East of 105° E), and ESEs occurred in 1654, 1660, 1665, 1670, 1676, 1683, 1689, 1690, 1700, 1714, 1719, 1830−32, 1840, 1877 and 1892; the second group is located mainly in the area south of Huaihe River (~33° N), and ESEs occured in 1694, 1887, 1929, and 1930; and the third group is confined within the central region between Yellow River and Nanling Mountain (roughly 26° to 35° N), and ESEs occurred in 1578, 1620, 1796, and 1841. We also examined the relationship between ESE occurrence and the temperature regimes within the 500 yr period. From the 20th century reanalysis data set of global atmospheric circulation available since 1871, we found a close association between the ESEs and the anomalous 500 hPa geopotential heights. This study presents cases of extreme winter snowfall occurring because of natural variability in global atmospheric circulation that can be used for paleo-climatology simulations and provide clues to understanding future extremes over China.