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The use of river runoff to test CSIRO9 land surface scheme in the Amazon and Mississippi River Basins

✍ Scribed by V.K. Arora; F.H.S. Chiew; R.B. Grayson

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 470 KB
Volume: 20
Category: Article
ISSN: 0899-8418
DOI: 10.1002/1097-0088(200008)20:10<1077::aid-joc517>3.0.co;2-t

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✦ Synopsis

Point validation of land surface schemes in general circulation models (GCMs) can only provide limited insight into the performance of the schemes when used over the large GCM grid cells. Streamflow, which integrates information over large areas, is a potentially useful diagnostic for assessing the land surface schemes at large spatial scales. This paper discusses the use of streamflow for assessing the performance of the CSIRO9 land surface scheme over the Amazon and the Mississippi River Basins. The paper shows that although streamflow can be a useful diagnostic tool for testing land surface schemes over large scales its utility is undermined by various problems: the atmospheric control on evapotranspiration, the possibility of compensating errors within large basins, and most importantly the lack of reliable grid-averaged atmospheric data at large spatial scales.

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