Sensitivity of the Potential Evapotranspiration to Key Climatic Variables in the Haihe River Basin
Sensitivity of the Potential Evapotranspiration to Key Climatic Variables in the Haihe River Basin
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发表时间：
2009
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通讯作者：
Cao Yingjie
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作者：
Cao Yingjie
蒸散量是水文循环的关键过程。潜在蒸散量（ET0）的敏感性分析有助于了解气候变化对水文循环的影响。本文采用无量纲敏感性系数来确定ET0对海河流域(HRB)气温(Tmean)、太阳辐射(Rs)、水汽压(VP)和风速(U2)变化的敏感性。 ET0 是用FAO Penman-Monteith 方程估算的。结果表明，年尺度参考蒸散量对VP最敏感，其次是Tmean、Rs和U2。就季节而言，春、夏季Tmean为最敏感变量，U2为最不敏感变量；秋冬季节VP为最敏感变量，Rs为最不敏感变量。从空间上看，ET0敏感性系数的温度（STmean）和蒸气压（SVP）呈现出从平原到丘陵地区递减的趋势。 HRB自南向北太阳辐射系数(SRS)减小，风速系数(SU2)自南向北增大。 1957年至2008年期间敏感性系数的长期趋势分析表明， 、SRS和STmean增加，而SVP减少。
Evapotranspiration is a key process in hydrologic cycle. Sensitivity analysis of potential evapotranspiration (ET0) is helpful in understanding the impact of climate change on hydrologic cycle. In this paper, a non-dimensional sensitivity coefficient was employed to identify the sensitivity of ET0 to the variation of air temperature (Tmean), solar radiation (Rs), vapor pressure (VP) and wind speed (U2) in the Haihe River basin (HRB). ET0 was estimated with the FAO Penman-Monteith equation. The results showed that the reference evapotranspiration was most sensitive to VP, which is followed by Tmean, Rs and U2 on an annual scale. In terms of season, Tmean was the most sensitive variable and U2 was the least sensitive variable in spring and summer, while VP was the most sensitive variable and Rs was the least sensitive variable in autumn and winter. Spatially speaking, the temperature (STmean) and vapor pressure (SVP) of ET0 sensitivity coefficients showed a decreasing trend from plain to hilly region. The coefficients of solar radiation (SRS) decreased from south to north of the HRB, while that of wind speed (SU2 ) increased from south to north. The long-term trend analysis of sensitivity coefficients for the period from 1957 to 2008 showed that , SRS and STmean increased, while SVP decreased.