Comparison study of MODIS evapotranspiration in Australia during 2000-2006

Mu, Q., Callow, N., Smettem, K., Waring, R. and Running, S. W. (2008). Comparison study of MODIS evapotranspiration in Australia during 2000-2006. In: , EOS Transactions AGU. American Geophysical Union Fall Meeting 2008, San Francisco, USA, (). 15-19 December 2008.


Author Mu, Q.
Callow, N.
Smettem, K.
Waring, R.
Running, S. W.
Title of paper Comparison study of MODIS evapotranspiration in Australia during 2000-2006
Conference name American Geophysical Union Fall Meeting 2008
Conference location San Francisco, USA
Conference dates 15-19 December 2008
Proceedings title EOS Transactions AGU   Check publisher's open access policy
Place of Publication Washington, D. C., USA
Publisher American Geophysical Union
Publication Year 2008
ISSN 0096-3941
Volume 89
Issue 53 (Fall Meeting Supplement)
Language eng
Abstract/Summary The global MOD16 evapotranspiration (ET) algorithm has been developed based on 20 AmeriFlux eddy covariance towers in 2001 (Mu et al., 2007). We tried to validate this global MOD16 ET algorithm in Australia with observed data during 2000-2006. First, the MOD16 ET algorithm was used to estimate the actual ET at 627 sites in Australia with MODIS data and the observed meteorological data as input. We compared ET with the site observed Pan-evaporation (ETo). In the driest condition where ETo is very high and ET is very low, the gap between ETo and ET is the largest. However, as the environment gets wetter, the gap narrows and ET increases. Over these 627 sites during 2000-2006, the range of annual precipitation is 525-1130370 mm/yr, and annual ET ranges between 40-720 mm/yr. The ratio of annual (rain-ET)/rain ranges between 1- 92%, and for most sites, 20-80% of the precipitation goes to runoff which is much higher than the observed ratio of streamflow to rainfall (ranging between 0-21%). (ET/storage). To compare with the real runoff values, we calculated the ET in the entire Australia, and calculated the annual difference between precipitation and ET (PE) at fivesix forested basins and one basin with part forest and part cleared. The comparison of ET with (precipitation-runoff) in sixa well gauged forest watersheds south inland from of Perth found that MOD16 ET is not sensitive to interannual variation in precipitation (R=0.34). The observed annual streamflow and discharge (runoff) at the seven basins in Australia were compared with PE. There are big biases Variability between modeled PE and observed runoff are evident , and which requires more work to improve the MOD16 ET algorithm in the future is required, but the potential for remote prediction of inter-annual plant ET parametersestimates and ungauged runoff estimation emmerge from this research.
Subjects 0401 Atmospheric Sciences
Keyword Evapotranspiration (ET)
MOD16
MODIS
Precipitation
Runoff
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Fri, 26 Feb 2010, 13:31:43 EST by Michael Affleck on behalf of Faculty of Science