Evaluation of Global Daily Reference ET Using Oklahoma’s Environmental Monitoring Network—MESONET

Wenjuan Liu, Yang Hong (), Sadiq Khan, Mingbin Huang, Trevor Grout and Pradeep Adhikari

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2011, vol. 25, issue 6, 1613 pages

Abstract: The objective of this study is to evaluate the potential utility of the USGS Global Data Assimilation System (GDAS) 1-degree, daily reference Evapotranspiration (ET 0 ) products by comparing them with observed Oklahoma mesonet daily ET 0 over a 2 year period (2005–2006). The comparison showed a close match between the two independent ET 0 products, with bias within a range of 10% for most of the sites and the overall bias of − 2.80%. The temporal patterns are strongly correlated, with a correlation coefficient above 0.9 for all groups. In summary, we conclude that (1) the consistent low bias shows the original GDAS ET 0 products have high potentials to be used in land surface modeling; (2) the high temporal correlations demonstrate the capability of GDAS ET 0 to represent the major atmospheric processes that control the daily variation of surface hydrology; (3) The temporal and spatial correspondences in trend between independent datasets (GDAS and MESONET) were good. The finding in Oklahoma, a different hydro-climate region from a similar regional study conducted in California by Senay et al. (J Am Water Res Assoc 44(4):969–979, 2008 ), reconfirms the reliability and potential of using GDAS reference ET for regional energy balance and water resources management in many parts of the world. Copyright Springer Science+Business Media B.V. 2011

Keywords: Evapotranspiration (ET); Reference ET; GDAS; Oklahoma MESONET (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1007/s11269-010-9763-0

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