Journal
REMOTE SENSING
Volume 10, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/rs10081175
Keywords
vapor pressure deficit; humidity; AMSR-E; 2; MERRA-2; passive microwave remote sensing
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Funding
- National Aeronautics and Space Administration (NASA) [NNX14AB20A, NNX15AB59G]
- NASA Modeling, Analysis and Prediction program
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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.
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