不同算法下中国大气水线及其意义.doc

不同算法下中国大气水线及其意义


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　　摘要 基于1961—2009年全球降水同位素网络（GNIP）监测站点同位素资料，运用最小二乘回归（OLSR）、简化主轴回归（RMA）、主轴回归（MA）、加权最小二乘回归（PWLSR）、加权简化主轴回归（PWRMA）和加权主轴回归（PWMA）6种方法计算了全国的大气水线方程，结果发现，大气水线方程的斜率和截距都一致的表现为东部季风区最大、西北干旱区居中、青藏高原区最小;斜率在空间上表现出由北方到南方逐渐增大的趋势，而截距的变化较为复杂;全国共30个站点的未加权算法的斜率和截距表现为OLSR>RMA>MA，同样地，加权算法的斜率和截距也表现出RYYWSR>PWRMA>PWMA;在6种大气水线算法下，东部季风区的斜率和截距在未加权和加权的2种情况下均为最大，西北干旱区在加权的算法下最小，而青藏高原区在未加权的算法下最小;以连续性大降水事件为主的东部季风区各站点可以选择RMA、MA算法;而以小降水事件为代表的西北内陆干旱区可以选择PWMA或者PWRMA算法将更加合理。
　　关键词 大气水线;计算方法;斜率;截距
　　Abstract Based on isotope data of global precipitation isotope network GNIP （Global Meteoric water Line of Craig）monitoring station from 1961 to 2009， OLSR， RMA， MA， PWLSR， PWRMA and PWMA methods were used to study the national atmospheric waterline results showed that the slope and intercept of the atmospheric water line equation were consistent performance for the eastern monsoon > northwest arid > qinghaitibet plateau area;the slope increased gradually from north to south in space， while the change of intercept was complex;the slope and intercept of the unweighted algorithm of 30 sites in China were shown as follows：OLSR >RMA>MA. Similarly， the slope and intercept of the weighted algorithm were shown as follows：RWSR>PWRMA>PWMA;the slope and intercept of the eastern monsoon region were the largest under the two conditions of unweighted and weighted， the northwest arid region was the smallest under the weighted algorithm， and the qinghaitibet plateau was the smallest under the unweighted station in the eastern monsoon region with continuous heavy precipitation events could choose RMA and MA algorithms;PWMA or PWRMA algorithm was more reasonable for the northwest inland arid regions represented by small precipitation events.
　　Key words Atmospheric waterline;Calculation method;Slope;Intercept
　　地球上的水循環经历了蒸发、输送、