Monitoring Drought over the Conterminous United States Using MODIS and   NCEP Reanalysis-2 Data

doi:10.1175/2010JAMC2328.1

CORC > 北京大学 > 地球与空间科学学院

	Monitoring Drought over the Conterminous United States Using MODIS and NCEP Reanalysis-2 Data
	Yao, Yunjun ; Liang, Shunlin ; Qin, Qiming ; Wang, Kaicun
刊名	journal of applied meteorology and climatology
	2010
关键词	SURFACE MOISTURE STATUS ENERGY-BALANCE APPROACH VEGETATION INDEX REFERENCE EVAPOTRANSPIRATION MAPPING EVAPOTRANSPIRATION AIR-TEMPERATURE SOIL-MOISTURE NET-RADIATION HEAT-FLUX SPACE
DOI	10.1175/2010JAMC2328.1
英文摘要	Monitoring land surface drought using remote sensing data is a challenge, although a few methods are available. Evapotranspiration (ET) is a valuable indicator linked to land drought status and plays an important role in surface drought detection at continental and global scales. In this study, the evaporative drought index (EDI), based on the estimated actual ET and potential ET (PET), is described to characterize the surface drought conditions. Daily actual ET at 4-km resolution for April-September 2003-05 across the continental United States is estimated using a simple improved ET model with input solar radiation acquired by Moderate-Resolution Imaging Spectroradiometer (MODIS) at a spatial resolution of 4 km and input meteorological parameters from NCEP Reanalysis-2 data at a spatial resolution of 32 km. The PET is also calculated using some of these data. The estimated actual ET has been rigorously validated with ground-measured ET at six Enhanced Facility sites in the Southern Great Plains (SGP) of the Atmosphere Radiation Measurement Program (ARM) and four AmeriFlux sites. The validation results show that the bias varies from -11.35 to 27.62 W m(-2) and the correlation coefficient varies from 0.65 to 0.86. The monthly composites of EDI at 4-km resolution during April-September 2003-05 are found to be in good agreement with the Palmer Z index anomalies, but the advantage of EDI is its finer spatial resolution. The EDI described in this paper incorporates information about energy fluxes in response to soil moisture stress without requiring too many meteorological input parameters, and performs well in assessing drought at continental scales.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000281514800006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Meteorology & Atmospheric Sciences; SCI(E); EI; 18; ARTICLE; 8; 1665-1680; 49
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311246]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Yao, Yunjun,Liang, Shunlin,Qin, Qiming,et al. Monitoring Drought over the Conterminous United States Using MODIS and NCEP Reanalysis-2 Data[J]. journal of applied meteorology and climatology,2010.
APA	Yao, Yunjun,Liang, Shunlin,Qin, Qiming,&Wang, Kaicun.(2010).Monitoring Drought over the Conterminous United States Using MODIS and NCEP Reanalysis-2 Data.journal of applied meteorology and climatology.
MLA	Yao, Yunjun,et al."Monitoring Drought over the Conterminous United States Using MODIS and NCEP Reanalysis-2 Data".journal of applied meteorology and climatology (2010).