• Adv. Atmos. Sci.  2017, Vol. 34 Issue (12): 1381-1394    DOI: 10.1007/s00376-017-6313-1
    Sensitivity of Potential Evapotranspiration Estimation to the Thornthwaite and Penman-Monteith Methods in the Study of Global Drylands
    Qing YANG1(), Zhuguo MA1, 2, Ziyan ZHENG1, Yawen DUAN1, 2
    1Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
    Abstract
    Abstract  

    Drylands are among those regions most sensitive to climate and environmental changes and human-induced perturbations. The most widely accepted definition of the term dryland is a ratio, called the Surface Wetness Index (SWI), of annual precipitation to potential evapotranspiration (PET) being below 0.65. PET is commonly estimated using the Thornthwaite (PET_Th) and Penman-Monteith equations (PET_PM). The present study compared spatiotemporal characteristics of global drylands based on the SWI with PET_Th and PET_PM. Results showed vast differences between PET_Th and PET_PM; however, the SWI derived from the two kinds of PET showed broadly similar characteristics in the interdecadal variability of global and continental drylands, except in North America, with high correlation coefficients ranging from 0.58 to 0.89. It was found that, during 1901-2014, global hyper-arid and semi-arid regions expanded, arid and dry sub-humid regions contracted, and drylands underwent interdecadal fluctuation. This was because precipitation variations made major contributions, whereas PET changes contributed to a much lesser degree. However, distinct differences in the interdecadal variability of semi-arid and dry sub-humid regions were found. This indicated that the influence of PET changes was comparable to that of precipitation variations in the global dry-wet transition zone. Additionally, the contribution of PET changes to the variations in global and continental drylands gradually enhanced with global warming, and the Thornthwaite method was found to be increasingly less applicable under climate change.

    Keywords potential evapotranspiration      global drylands      Thornthwaite      Penman-Monteith     
    Just Accepted Date: 01 September 2017   Issue Date: 08 November 2017
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    Qing YANG
    Zhuguo MA
    Ziyan ZHENG
    Yawen DUAN
    Cite this article:   
    Qing YANG,Zhuguo MA,Ziyan ZHENG, et al. Sensitivity of Potential Evapotranspiration Estimation to the Thornthwaite and Penman-Monteith Methods in the Study of Global Drylands[J]. Adv. Atmos. Sci., 2017, 34(12): 1381 -1394 .
    URL:  
    http://159.226.119.58/aas/EN/10.1007/s00376-017-6313-1     OR     
    http://159.226.119.58/aas/EN/Y2017/V34/I12/1381
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