【摘要】 将NCAR CCM3辐射传输方案CRM(Column Radiation Model)引入到P-σRCM9区域气候模式中,并对两组辐射传输方案下P-σRCM9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-σRCM9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-σRCM9区域气候模式对对流层高层(200~100 hPa)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200~300 hPa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-σRCM9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-σRCM9气候模式对中国地区冬、夏季降水的模拟能力。更多还原

【Abstract】 The NCAR CCM3 radiative transfer scheme CRM(Column Radiation Model) has been introduced into P-σ RCM9regional climate model,and the difference of the climate characteristics over east Asia in winter and summer simulated by P-σ RCM9between with KQ and with CRM radiative transfer scheme has been contrastivelystudied 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 theimprovement is much more significant in summer than in winter.The improved simulations of the east Asian subtropic westerlyjet in winter and summer follow the improvement in simulating the mean meridional air temperature grads in 200~300 hPaowing 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 RCM9with CRM is closer to the observation than that in KQ experiment,CRM radiative scheme can significantly improve the P-σ RCM9′s abilityin simulating the precipitation over China in winter and summer.更多还原