Global Satellite Retrievals of the Near-Surface Atmospheric Vapor Pressure Deficit from AMSR-E and AMSR2

被引：18

作者：

Du, Jinyang ^{[1
]}

Kimball, John S. ^{[1
]}

Reichle, Rolf H. ^{[2
]}

Jones, Lucas A. ^{[1
]}

Watts, Jennifer D. ^{[1
,3
]}

Kim, Youngwook ^{[1
]}

机构：

[1] Univ Montana, WA Franke Coll Forestry & Conservat, Numer Terradynam Simulat Grp, Missoula, MT 59812 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Woods Hole Res Ctr, Falmouth, MA 02540 USA

来源：

REMOTE SENSING | 2018年 / 10卷 / 08期

基金：

美国国家航空航天局;

关键词：

vapor pressure deficit; humidity; AMSR-E; 2; MERRA-2; passive microwave remote sensing; PRECIPITABLE WATER; AIR-TEMPERATURE; LAND; REANALYSIS; DROUGHT; PHOTOSYNTHESIS; SENSITIVITY; MOISTURE; SOIL;

D O I：

10.3390/rs10081175

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Near-surface atmospheric Vapor Pressure Deficit (VPD) is a key environmental variable affecting vegetation water stress, evapotranspiration, and atmospheric moisture demand. Although VPD is readily derived from in situ standard weather station measurements, more spatially continuous global observations for regional monitoring of VPD are lacking. Here, we document a new method to estimate daily (both a.m. and p.m.) global land surface VPD at a 25-km resolution using a satellite passive microwave remotely sensed Land Parameter Data Record (LPDR) derived from the Advanced Microwave Scanning Radiometer (AMSR) sensors. The AMSR-derived VPD record shows strong correspondence (correlation coefficient 0.80, p-value < 0.001) and overall good performance (0.48 kPa Root Mean Square Error 0.69 kPa) against independent VPD observations from the Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) data. The estimated AMSR VPD retrieval uncertainties vary with land cover type, satellite observation time, and underlying LPDR data quality. These results provide new satellite capabilities for global mapping and monitoring of land surface VPD dynamics from ongoing AMSR2 operations. Overall good accuracy and similar observations from both AMSR2 and AMSR-E allow for the development of climate data records documenting recent (from 2002) VPD trends and potential impacts on vegetation, land surface evaporation, and energy budgets.

引用

页数：20

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