不同辐射传输方案对P-σ RCM9区域气候模式性能的影响  

Impacts of Different Radiative Transfer Schemes on the Performance of P-σ RCM9 Regional Climate Model

作　　者：黄安宁[1] 张耀存[1] 

机构地区：[1]南京大学大气科学系,江苏南京210093

出　　处：《高原气象》2009年第1期1-11,共11页Plateau Meteorology

基　　金：国家自然科学基金重点项目(40333026);公益性行业(气象)科研专项"中国气候系统协同观测与预测研究"(GYHY(QX)2007-6-5)共同资助

摘　　要：将NCARCCM3辐射传输方案CRM（Column Radiation Model）引入到P-σ RCM9区域气候模式中，并对两组辐射传输方案下P-σ RCM9区域气候模式模拟的东亚冬、夏季气候特征差异进行对比分析，发现采用CRM辐射传输方案能够改善P-σ RCM9区域气候模式对中国区域冬、夏季地面温度的模拟，且在夏季的改善比冬季更明显，还改善了P-σ RCM9区域气候模式对对流层高层（200-100hPa）短波辐射加热率和长波辐射加热率的计算，然后改进了模式对200-300hPa垂直平均经向温度梯度的模拟，进而使得模拟的冬、夏季东亚高空西风急流比采用KQ辐射传输方案的模拟结果更加接近NCEP/NCAR再分析资料。同时还发现，采用CRM辐射传输方案后，P-σ RCM9气候模式模拟的中国地区冬、夏季的降水率在强度和分布形势上均比采用KQ辐射传输方案的模拟结果更接近观测，CRM辐射传输方案能够较明显地提高P-σ RCM9气候模式对中国地区冬、夏季降水的模拟能力。The NCAR CCM3 radiative transfer scheme CRM （Column Radiation Model） has been introduced into P-σ RCM9 regional climate model, and the difference of the climate characteristics over east Asia in winter and summer simulated by P-σ RCM9 between with KQ and with CRM radiative transfer scheme has been contrastively studied in this paper. It is found that adopting CRM can improve the P-σ RCM9＇s performance in simulating the surface temperature over China in winter and summer, and the improvement is much more significant in summer than in winter. The improved simulations of the east Asian subtropic westerly jet in winter and summer follow the improvement in simulating the mean meridional air temperature grads in 200-300 hPa owing to the improved caculations of the long and short wave radiative heating rates in mid-higher tropospheres. Meanwhile, it is noted that the precipitation over China in winter and summer simulated by P-σ RCM9 with CRM is closer to the observation than that in KQ experiment, CRM radiative scheme can significantly improve the P-σ RCM9＇s ability in simulating the precipitation over China in winter and summer.

关 键 词：区域气候模式 辐射传输方案 温度模拟 西风急流 降水模拟 

分 类 号：P422.9[天文地球—大气科学及气象学]