基于GRACE重力卫星数据监测分析贵州干旱特征

基于GRACE重力卫星数据，采用改进的组合高斯滤波法和尺度因子法提高数据精度，利用陆地水储量变化原理反演贵州2003-08~2013-07的水储量变化量，并将计算的相对水储量指数作为干旱指标，提出运用游程理论基于相对水储量指数识别干旱历时和干旱烈度，监测分析贵州干旱特征。结果表明，基于GRACE卫星数据获得的相对水储量指数与SPI3变化趋势基本一致；GRACE卫星监测到2003-08~2013-07贵州每年都有干旱事件发生，历时最短为1个月，其中历时≥3个月的干旱事件共9次；干旱强度较大的事件发生在2003~2006年和2009~2011年，其中2006年和2011年水储量亏损较严重，与贵州实际的干旱情况相吻合。

Monitor and Analyze the Drought Characteristics of Guizhou Based on GRACE Gravity Satellite Data

Based on GRACE gravity satellite data,in this paper we adopt the improved combination Gaussian filtering method and scale factor method to improve data accuracy.The water storage changes of Guizhou from August 2003 to July 2013 are retrieved using the theory of terrestrial storage changes;the relative water storage index is calculated as the drought index.Meanwhile,drought duration and intensity are identified by Run theory,so as to monitor and analyze the drought characteristics of Guizhou.We found that the relative water storage index obtained from GRACE satellite data is basically consistent with the trend of SPI3.Besides,GRACE shows that drought events occurred in Guizhou every year from August 2003 to July 2013,with the shortest lasting for a month,and nine drought events lasting more than or equal to 3 months.Years with high drought intensity occurred in 2003-2006,2009-2011.The loss of water storage in 2006 and 2011 were especially more serious,which is consistent with the actual drought situation in Guizhou for many years.