Journal of Arid Meteorology ›› 2019, Vol. 37 ›› Issue (2): 198-208.DOI: 10.11755/j.issn.1006-7639(2019)-02-0198

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Reanalysis on the Causes of Continuous Drought from Autumn 2010 to Spring 2011 in the Middle and Lower Reaches of the Yangtze River

Lü Xingyue, RONG Yanshu, SHI Dandan   

  1. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
  • Online:2019-04-30 Published:2019-04-30

长江中下游地区2010/2011年秋冬春连旱成因再分析

吕星玥,荣艳淑,石丹丹   

  1. 河海大学水文水资源学院,江苏 南京 210098
  • 通讯作者: 荣艳淑(1961— ),女,教授,博士,主要从事水文气象和气候变化方面研究. E-mail:ysron@hhu.edu.cn。
  • 作者简介:吕星玥(1994— ),女,硕士生,主要从事水文气象研究. E-mail:562087530@qq.com。
  • 基金资助:
    “十三五”国家重点研发计划项目(2016YFA0601504)和国家自然科学基金重点国际(地区)合作研究项目(51420105014)共同资助

Abstract: Abstract:Based on the monthly precipitation at 70 meteorological stations in the middle and lower reaches of the Yangtze River (MLRYR), monthly precipitation grid data from Climate Research Unit in University of East Anglia of UK, monthly sea surface temperature (SST) from NOAA and monthly reanalysis data from NCEP/NCAR, the spatial and temporal characteristics of continuous drought event from the autumn of 2010 to the spring of 2011 in MLRYR were analyzed. And the possible causes of the continuous drought event were further discussed. The results are as follows: (1) The continuous regional drought event in MLRYR began in October 2010, and lasted to the beginning of June 2011. The drought was most serious in spring 2011, especially in April, and the drought degrees in most regions of  MLRYR appeared severe drought and extreme drought. (2) The continuous drought event was affected by La Nia event. The SST was abnormally warm in the equatorial western Pacific and abnormally cold in Indian Ocean and Kuroshio area in winter and spring, which led to significant enhancement of Walker circulation and local Hadley circulation and the obvious weakening of the western Pacific subtropical high. The sinking airflow controlled MLRYR, and the water vapor transport to MLRYR was weak. (3) Ural blocking high, Baikal blocking high and Okhotsk blocking high controlled alternatively over middle and high latitudes since the fall of 2010, which caused the continuous strengthening of the Siberian high and the Aleutian low, and the enhanced winter monsoon affected the eastern part of China until the spring of 2011. The dry and cold northerly airflow controlled MLRYR, which further hindered the warm and humid airflow transportation from low latitudes to the region, and it wasn’t conducive to the formation of precipitation.

Key words: continuous drought from autumn to next spring, SST anomaly, atmospheric circulation anomaly, the middle and lower reaches of the Yangtze River

摘要: 基于长江中下游70个气象站点逐月降水和CRU逐月降水格点数据、NOAA逐月海温数据以及NCEP/NCAR逐月再分析数据,分析长江中下游地区2010/2011年秋冬春连旱的时空特征,进一步探讨此次连旱的可能成因。结果表明:(1)2010/2011年长江中下游区域性秋冬春连旱事件始于2010年10月,止于2011年6月,其中2011年春季(特别是4月)干旱程度最重,大部分地区为重旱和特旱;(2)此次连旱事件受拉尼娜事件影响,赤道西太平洋海温异常偏暖、冬春季印度洋和黑潮区海温异常偏冷,使得Walker环流上升支和局地Hadley环流显著增强、西太平洋副热带高压显著偏弱,长江中下游地区始终处于下沉气流控制下,且水汽输送减少;(3)自2010年秋季,乌拉尔山阻塞高压、贝加尔湖阻塞高压和鄂霍次克海阻塞高压轮番控制中高纬度地区,使得西伯利亚高压和阿留申低压持续增强,冬季风自秋季便开始影响中国东部地区,并一直持续到2011年春季,长江中下游地区受干冷的偏北气流控制,进一步阻碍了来自低纬的暖湿气流向本地输送,不利于降水的形成。

关键词: 秋冬春连旱, 海温异常, 环流异常, 长江中下游

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