水资源保护2018，Vol.34Issue(3)：22-29,8.DOI:10.3880/j.issn.1004-6933.2018.03.04
云南2009-2014年持续性气象水文干旱特征及成因分析
Analysis on characteristics and causes of persistent meteorological and hydrological drought in Yunnan from 2009 to 2014
摘要
Abstract
Spatio-temporal change characteristics of the persistent meteorological and hydrological drought in Yunnan from 2009 to 2014 were analyzed based on Dai Palmer drought severity index (Dai-PDSI) and streamflow drought index (SDI).The causes of persistent drought were investigated based on the NCAR/NCEP reanalysis data from various perspectives including:the West Pacific subtropical high,Tibetan high,Southern Branch Trough,tropospheric vertical motion,and vertical distribution of water vapor.The results showed that the persistent drought from 2009 to 2014 was the longest drought in Yunnan since 1961.The driest period was from October,2009 to September,2010,and summer and winter were two driest seasons.The drought in the east of Yunnan was the heaviest and the drought in the southeastern part was slightly light.Hydrologic drought was accompanied by meteorological drought.The heaviest hydrological drought was in Jinsha River and Nanpan River.Secondary hydrological drought occurred in the Lancang River.In terms of strength,hydrologic drought is weaker than meteorological drought.In summer,the atmosphere over Yunnan was controlled continuously by downward flow due to that the West Pacific subtropical high was stronger and westward and the Tibetan high center was westward.In winter,the Southern Branch Trough was weak and could not help to guide the water vapor from Bengal Bay to Yunnan.In other seasons,downward flow prevailed and water vapor was seriously shortage in troposphere.关键词
气象干旱/水文干旱/持续性干旱/干旱成因/云南省Key words
meteorological drought/hydrological drought/persistent drought/drought causes/Yunnan Province分类
天文与地球科学引用本文复制引用
荣艳淑,巩琳,卢寿德..云南2009-2014年持续性气象水文干旱特征及成因分析[J].水资源保护,2018,34(3):22-29,8.基金项目
国家自然科学基金(51420105014) （51420105014）
“十三五”国家重点研发计划项目(2016YFA0601504) （2016YFA0601504）
