全球降水中氢氧稳定同位素GCM模拟空间分布的比较

Comparison on Spatial Distribution of Hydrogen and Oxygen Stable Isotope GCM Simulation in Global Precipitation

利用大气环流模式模拟降水中氢氧稳定同位素可以深入了解水循环过程中水稳定同位素的迁移变化规律并弥补实测数据在空间和时间方面的不连续性。利用10个引入水稳定同位素循环的GCM(General Circulation Models)模拟数据,分析了全球降水中稳定同位素效应的空间分布特征,对不同模式的模拟结果之间以及模拟结果与全球降水同位素监测网络(GNIP)的实际监测结果之间进行了比较,旨在对稳定同位素大气环流模式模拟结果的有效性进行评价,改善对水循环中水稳定同位素效应的理解和认识。结果显示,在δ^(18)O的全球空间分布模拟方面,iso GSM,ECHAM4,LMDZ4和Had AM3模拟效果较佳;在δ^(18)O的季节差的空间分布模拟方面各模式模拟效果总体较好,仅Had AM3模拟效果稍差;在δ^(18)O与气温相关关系的空间分布模拟方面,iso GSM,GISS E-F,ECHAM4,GISS E-N和LMDZ4模拟结果与实测较匹配;在δ^(18)O与降水量相关关系的空间分布模拟方面LMDZ4,iso GSM,GISS E-F,ECHAM4和MUGCM模拟能力较强;在全球大气降水线模拟方面GISS E-F,iso GSM和GISS E-N优势明显。

The general circulation models are used to simulate hydrogen and oxygen stable isotope in precipitation,which can enhance our understanding of the migratory processes of water stable isotope in water cycle and remedy disadvantages of measured data in spatial and temporal discontinuity. We used ten GCM( General Circulation Models) simulated data including stable isotope water cycle,and analyzed the spatial distribution characteristics of oxygen stable isotope effect in global precipitation. Meanwhile,we compared different simulated results as well as simulated results and the GNIP( Global Network of Isotopes in Precipitation) actual monitoring results. Our main purposes were to evaluate the simulative validity of stable isotope atmospheric circulation and improve our understanding and cognition for stable isotopic effect in water cycle. The results indicated that iso GSM,ECHAM4,LMDZ4 and Had AM3 showed good performances in simulating δ^(18)O. Expect Had AM3,other simulated conclusion of models had good performances in the aspect of simulate seasonal difference of δ^(18)O in spatial distribution. The simulated results of iso GSM,GISS E-F,ECHAM4,GISS E-N and LMDZ4 matched monitoring results more in the aspect of simulating relationship between δ^(18)O and air temperature in spatial distribution. LMDZ4,iso GSM,GISS E-F,ECHAM4 and MUGCM had stronger capacity in the aspect of simulating relationship between δ^(18)O and precipitation in spatial distribution. GISS E-F,iso GSM and GISS E-N had more advantage of simulate global meteoric water line.