BATS1e陆面模式对p-σ九层区域气候模式性能的影响  

Impacts of the BATS1e Land Surface Model on the Performance of the p-σ 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,南京210093

出　　处：《大气科学》2007年第1期155-166,共12页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金资助项目40275032;40333026

摘　　要：将BATS1e(Biosphere-Atmosphere Transfer Scheme version 1e)陆面模式与p-σ九层区域气候模式(PσRCM9)进行耦合,发展了一个包含有更复杂陆-气相互作用的区域气候模式(BATS1e-PσRCM9)。通过对东亚地区1月和7月气候平均场和1991年江淮流域梅雨期间三次强降水过程的数值模拟,考察了BATS1e陆面模式对PσRCM9模式模拟性能的影响。数值试验结果表明,BATS1e-PσRCM9模式对东亚区域冬、夏季气候平均场的模拟能力有明显提高,且对近地层和对流层低层各气象要素场模拟效果的改善比对流层中高层更加明显。与PσRCM9模式的模拟结果相比,BATS1e-PσRCM9模式对中国东南部地区降水的模拟与观测更为一致,并且对江淮流域梅雨期间的强降水过程也有较好的模拟能力。由于BATS1e-PσRCM9模式改进了地气之间动量、热量和水汽通量交换的计算,更好地描述了陆地下垫面与大气之间的相互作用,从而改善了模式对近地层各气象要素场的模拟。因此,通过耦合BATS1e陆面模式能较明显地提高PσRCM9模式模拟东亚区域短期气候变化的能力,这为区域气候模式的进一步发展奠定了基础。The p-σ regional climate model （PσRCMg） was developed for climate forecast over East Asia in the 1990s, and it has good performance in simulating the climate change over East Asia, but it still has some deficiencies and need to be improved, for instance, its land surface process treatment is so simple that it can not elaborately describe the exchanges of the momentum fluxes, heat fluxes and moisture fluxes between land and air. The calculations of these flux exchanges are very important to improve the performance of PσRCMg, so it is necessary to improve these flux calculations in PσRCMg. For this purpose, the authors choose Biosphere- Atmosphere Transfer Scheme version le （BATS1e） to replace the old soil model in PσRCM9 regional climate model. BATS1e has been developed for suiting various NCAR General Circulation Models （GCMs）, and its special emphasis has been given to describe properly the role of the vegetation in modifying the surface moisture and energy budgets. It has been coupled with many GCMs and RCMs, and it has good performance in simulating the flux exchanges between land and air. A coupling model （BATS1e-PRσCM9） with much more complex land-air interactions has been developed by incorporating BATS1e into PσRCM9 in this paper, and the impacts of the BATS1e on the PσRCM9 are examined by simulating the mean fields over East Asia in January and July and the three heavy rain processes occurred over the Yangtze River and Huaihe River basins during the Meiyu period in 1991. The model results show that the capability of the BATS1e-PσRCM9 in simulating the climate mean fields over East Asia in winter and summer has been improved obviously, and the improvement of the simulated meteorological elements in the near-surface layer and the lower troposphere is more remarkable than in the middle-upper troposphere. The BATS1e-PσRCM9 can simulate the precipitation over southeastern China much better compared with the PσRCM9 results, and it has a good performance in simulating the three heavy

关 键 词：陆面模式 区域气候模式 数值模拟 模式性能 

分 类 号：P435[天文地球—大气科学及气象学]