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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.39 [2010] >
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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