利用GRACE数据研究美国干旱产生的原因

利用GRACE和GLDAS数据计算美国2003年1月—2013年12月陆地等效水高的时间序列,两者结果呈强相关,相关系数为0.91.GRACE数据计算陆地水储量最低在2012年7月,这与欧洲干旱研究中心发布的帕尔默干旱指数(scPDSI)结果一致,证明了GRACE时变地球重力场模型具备探测干旱的能力.利用NOAA(Na...

Using GRACE Data to Study American Drought and Its Causes

In this paper,we used GRACE and GLDAS data to calculate the time series of terrestrial equivalent water in the United States from Jan.2003 to Dec.2013.The two calculation results were strongly correlated with a correlation coefficient of 0.91.The lowest land water was calculated by GRACE data reserves in Jul.2012,which is consistent with the results of the Palmer Drought Index(scPDSI)issued by the European Drought Research Center.It proves that the GRACE time-varying earth gravity field model has the ability to detect drought.The data released by NOAA(National Oceanic&Atmospheric Administration)was used to calculate the rainfall and evaporation during the drought and compared with the average rainfall and evaporation in the past 30 years.Finally,the reason for the drought in the US in the summer of 2012 is that the rainfall in some regions of the central region is less than the average of 40—50 mm.The temperature in the central and western regions is higher than the average,which resulting in evaporation in some states above the average of 10—20 mm.