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作 者:郑婧[1,2,3] 谢正辉[1] 戴永久[4] 袁星[1,2] 毕训强
机构地区:[1]中国科学院大气物理研究所,北京100029 [2]中国科学院研究生院,北京100049 [3]国家卫星气象中心,北京100081 [4]北京师范大学地理学与遥感科学学院,北京100875 [5]The Ahdus Salam International Centre for Theoretical Physics, Trieste 34100, Italy
出 处:《大气科学》2009年第4期737-750,共14页Chinese Journal of Atmospheric Sciences
基 金:中国科学院知识创新工程重要方向项目KZCX2-YW-126-2、KZCX2-YW-217;国家重点基础研究发展规划项目2009CB421407
摘 要:陆面过程通过影响陆面和大气之间物质(如,水分)和能量的交换影响气候,其参数化方案对数值天气预报、全球及区域气候模拟有重要影响。本研究利用对生物物理、生物化学过程考虑更全面的陆面模式Common Land Model(CoLM)替代区域气候模式RegCM3原有的陆面模式BATS,发展了耦合区域气候模式C-RegCM3;将其应用于东亚地区典型洪涝年份夏季气候模拟以进行评估,结果表明新耦合的模式C-RegCM3能合理模拟大尺度环流场、近地表气温和降水的分布特征,对西北半干旱地区降水模拟比RegCM3有所改进。通过利用区域气候模式C-RegCM3及RegCM3对地表能量和水文过程模拟结果的比较,发现在半干旱、半湿润过渡区C-RegCM3模拟的潜热增大、感热减小;模拟的地表吸收太阳辐射差异较明显的地区位于模式模拟的主要雨区;C-RegCM3在上述过渡区模拟的夏季地表土壤湿度比RegCM3偏干,这与它在过渡区降水模拟偏少、蒸散发模拟偏大相对应,体现了该模式在半干旱、半湿润过渡带模拟出比RegCM3更明显的局地土壤湿度-降水-蒸散发之间的正反馈作用。Land surface processes affect the climate through exchanges of materials (e. g. , water) and energy across the land- atmosphere interface, and their parameterizations play an important role in numerical weather forecasting and global and regional climate studies. In this work, the Common Land Model (CoLM), with biophysical and bio- chemical process parameterizations, is coupled to the regional climate model RegCM3 by replacing its original land surface schem6 BATS. The newly coupled model is called C-RegCM3 hereafter. Simulations by C-RegCM3 for sum- mer climate of a flooded year over East Asia are undertaken to validate the newly developed model. C-RegCM3 shows reasonable results of general atmospheric circulation, near-surface air temperature and precipitation, and it improves the simulation of precipitation in the semi-arid region of Northwest China. Comparisons of simulated sur- face energy and hydrological processes by C-RegCM3 and those by RegCM3 indicate that C-RegCM3 tends to get more latent heat fluxes but less sensible heat fluxes in the semi-arid and semi-humid areas, while the region, where obvious difference between the absorbed solar radiation from C-RegCM3 and that from RegCM3 exists, is located in the simulated rainy areas. The simulated soil moisture at the surface by C-RegCM3 tends to be drier, which is con- sistent to less precipitation and more evapotranspiration in this region than that by RegCM3 in the transition zone of semi-arid and semi-humid areas during summer. It means that the simulated positive feedback of soil moisture - precipitation- evapotranspiration by C-RegCM3 is stronger than that by RegCM3 over the transition zone.
分 类 号:P461[天文地球—大气科学及气象学]
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