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Estimation of annual potential evapotranspiration at regional scale based on the effect of moisture on soil respiration

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  • Liang, Liyin
  • Peng, Shaolin
  • Sun, Junmei
  • Chen, Leiyi
  • Cao, Yuexiu

Abstract

Potential evapotranspiration (PET) is an important component of water cycle. For traditional models derived from the principle of aerodynamics and the surface energy balance, its calculation always includes many parameters, such as net radiation, water vapor pressure, air temperature and wind speed. We found that it can be acquired in an easier way in specific regions. In this study, a new PET model (PETP model) derived from two empirical models of soil respiration was evaluated using the Penman–Monteith equation as a standard method. The results indicate that the PETP model estimation concur with the Penman–Monteith equation in sites where annual precipitation ranges from 717.71mm to 1727.37mm (R2=0.68, p=0.0002), but show large discrepancies in all sites (R2=0.07, p=0.1280). Then we applied our PETP model at the global scale to the regions with precipitation higher than 700mm using 2.5° CMAP data to obtain the annual PET for 2006. As expected, the spatial pattern is satisfactory overall, with the highest PET values distributed in the lower latitudes or coastal regions, and with an average of 1292.60±540.15mmyear−1. This PETP model provides a convenient approach to estimate PET at regional scales.

Suggested Citation

  • Liang, Liyin & Peng, Shaolin & Sun, Junmei & Chen, Leiyi & Cao, Yuexiu, 2010. "Estimation of annual potential evapotranspiration at regional scale based on the effect of moisture on soil respiration," Ecological Modelling, Elsevier, vol. 221(22), pages 2668-2674.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:22:p:2668-2674
    DOI: 10.1016/j.ecolmodel.2010.08.010
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    References listed on IDEAS

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    3. C.-Y. Xu & V. Singh, 2002. "Cross Comparison of Empirical Equations for Calculating Potential Evapotranspiration with Data from Switzerland," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 16(3), pages 197-219, June.
    4. Goyal, R. K., 2004. "Sensitivity of evapotranspiration to global warming: a case study of arid zone of Rajasthan (India)," Agricultural Water Management, Elsevier, vol. 69(1), pages 1-11, September.
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