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IJRSP Vol.39(1) [February 2010] >


Title: Estimation of surface vapour pressure deficits using satellite derived land surface temperature data
Authors: Singh, Devendra
Keywords: Vapour pressure deficit (VPD)
Land surface temperature (LST)
Saturation vapour pressure (SVP)
Issue Date: Feb-2010
Publisher: CSIR
PACS No.: 92.60.hv
Abstract: Vapour pressure deficit (VPD), the difference between saturated vapour pressure at air temperature and actual vapour pressure, is one of the most important climatic variables used in ecosystem models to simulate fluxes and states of water and carbon. VPD at different spatial and temporal resolution over regional and local scale has been estimated. The methodology of estimating VPD is based on simple linear relationship between saturation vapour pressure and land surface temperature measurements captured by polar-orbiting satellites. The VPD is evaluated at regional and local scales after comparison with observed weather station data. The estimated VPD is found to be in good agreement with in-situ observations with rms error and bias as 0.79 kPa and 0.23 kPa, respectively. Further, this study has brought out the impact of VPD on vegetation over a period of six years (2003-2008). The higher value of VPD for the year 2004 highlights drought condition while comparing amongst the six-years period (2003-2008).
Page(s): 25-31
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.39(1) [February 2010]

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