区域海气耦合模式模拟中国夏季降水能力分析  

Simulation Capability of China Summer Precipitation with a Regional Air–Sea Coupled Model

作　　者：李涛[1,2] 周广庆[3] 王芳栋 

机构地区：[1]国家海洋环境预报中心,北京100081 [2]国家海洋局海洋灾害预报技术研究重点实验室,北京100081 [3]中国科学院大气物理研究所,北京100029 [4]北京飞行控制中心,北京100094

出　　处：《气候与环境研究》2013年第6期701-709,共9页Climatic and Environmental Research

基　　金：国家重点基础研究发展计划项目2010CB951901;国家高技术研究发展计划项目2010AA012401;国家海洋公益性行业科研专项201105019

摘　　要：基于OASIS3(Ocean Atmosphere Sea Ice Soil version 3)耦合器,耦合区域气候模式RegCM3(Regional Climate Model version 3)和海洋模式HYCOM(Hybrid Coordinate Ocean Model),建立一个区域海气耦合模式,并通过嵌套方法处理海洋模式的侧边界问题。运用该耦合模式对1982～2001年包括中国在内的东亚地区气候进行连续模拟,重点分析其对中国夏季(6～8月)降水的模拟性能。结果表明:耦合模式基本可以模拟出中国夏季降水的空间分布特征,模拟的降水量值和年际变化在靠近海洋的沿海区域比参照试验有一定程度的改善;能够再现观测夏季降水经验正交函数第一模态(EOF1)的空间分布特征,与观测EOF1的时间相关性也比参照试验有较大提高;前6个模态的组合分析也表明耦合模式对长江中下游、山东半岛、海南岛等区域夏季降水的较大时间尺度气候分量的模拟改善更显著。Based on an OASIS3 （Ocean Atmosphere Sea Ice Soil version 3） coupler, a regional air-sea coupled model is developed by coupling the regional climate model RegCM3 （Regional Climate Model version 3） and the ocean model HYCOM （Hybrid Coordinate Ocean Model）. The nesting method is used to properly handle the issue of the ocean lateral boundary conditions. A continuous integration of East Asia, including China, is conducted （1982-2001）. The focus point is to verify the simulation capability of the summer precipitation （June-August） over China. The simulation results show that the coupled model can reproduce the spatial distribution of the summer precipitation over China. When compared with the uncoupled experiment, the coupled model shows a better performance in simulating the rainfall amount and the interannual variation over the near-sea regions. The coupled model can also capture the distribution of the first mode ofobservation with the empirical orthogonal function （EOF） and the corresponding time correlation with the observational EOF 1 （the first EOF mode） is enhanced when compared to the uncoupled model. Moreover, combined analysis of the first six modes indicates that there is further improvement for the large temporal scale climate component of the summer precipitation over the mid-low valley of the Yangtze River, Shandong Peninsula, and the Hainan Island after coupling.

关 键 词：区域 耦合模式 夏季降水 OASIS3耦合器 

分 类 号：P467[天文地球—大气科学及气象学]