辽河三角洲不同干湿气候区参考蒸散发敏感因子时空变化

根据辽河三角洲19个气象台站1961~2010年气象观测资料,采用Penman-Monteith参考蒸散发计算方法,分析辽河三角洲半湿润区、半干旱区以及滨海干湿过渡区3个气候亚区参考蒸散发对平均气温、风速、相对湿度和太阳辐射的敏感性及其时空分异。结果表明：在半干旱区,敏感系数由大到小依次是相对湿度、风速、太阳辐射和平均气温;在半湿润区和滨海干湿过渡区,敏感系数由大到小依次是相对湿度、太阳辐射、平均气温和风速。不同气候亚区参考蒸散发对气象因子的敏感系数具有较大的差异和变化趋势。

Spatial and Temporal Change of Reference Evapotranspiration Sensitivity in Different Dry and Wet Climate Zones in Liaohe Delta

Based on the long-term meteoro1ogical data at 19 meteorological stations over Liaohe Delta during the period of 1961-2010, the sensitivities of Penman-Monteith ET₀ to the mean temperature(S_tm), wind speed(S_u), relative humidity(S_rh) and solar radiation(S_rs) were calculated and analyzed in three climate sub-regions over Liaohe Delta. The results show that relative humidity is the most sensitive variable to ET₀ in semi-arid sub-region, followed by wind speed, solar radiation and air temperature. While, relative humidity is the most sensitive variable to ET₀ in semi-humidity sub-region and coast zone, followed by solar radiation, air temperature and wind speed. Trend analysis and Mann-Kendall significant test in both of seasonal and interannual scale demonstrate that sensitivity coefficients of ET₀ to air temperature, wind speed, relative humidity and solar radiation present variation and change trend among semi-arid sub-region, semi-humidity sub-region and coastal zone.