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针对2010年春季我国西南地区出现的严重干旱,采用MODIS数据和TVDI方法对云南省春季旱情进行了监测,揭示了云南省入春以来的旱情动态变化及旱情分布特点。以TVDI作为旱情评价的指标,并结合气象观测的探空资料、天气图以及ncep月平均气温资料和MODIS数据反演大气含水量,分析了导致云南省春旱的地面温湿特征、大气环流特征及大气能量结构特征,提出了此次干旱特殊的形成机理:大气环流、大气能量结构以及地热蒸发等因素的综合作用导致了严重干旱的发生,这对干旱的监测预警提供了有益探索。
According to the severe drought in the southwest of China in spring of 2010, MODIS data and TVDI method were used to monitor the spring drought in Yunnan Province. The dynamic changes of drought conditions and drought distribution in Yunnan Province since spring were revealed. Taking TVDI as an indicator of drought assessment and combining the meteorological data of meteorological observation, weather map, ncep monthly mean temperature data and MODIS data to retrieve the atmospheric water content, the characteristics of the surface temperature and humidity, atmospheric circulation characteristics And the characteristics of atmospheric energy structure. The formation mechanism of this drought is proposed. The combined effects of atmospheric circulation, atmospheric energy structure and geothermal evaporation lead to the occurrence of severe drought, which provides a useful exploration of drought monitoring and early warning.