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NCC/IAP T63海气耦合模式对云滴有效半径的敏感性分析 预览

Sensitivity of NCC/IAP T63 Atmosphere-ocean Coupled Model to Cloud Droplet Effective Radius
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摘要 利用NCC/IAP T63海气耦合模式研究了模拟对云滴有效半径的敏感性。结果表明,可变水云粒子有效半径的引入(REL和REL_CAM3方案)导致对流层中下部云消光光学厚度的明显变化,但REL和REL_CAM3之间的变化位置不同、符号相反;而引入可变的冰云粒子有效半径后(REI方案),对流层中上部的云消光光学厚度明显减小。云辐射强迫的变化主要受REI方案的影响,长波和短波云辐射强迫均以减小为主;从全球平均来看,大气顶云辐射强迫的变化对冰云有效半径的变化更加敏感,尽管量级还有明显差距,各种方案均正确模拟出了大气顶净云辐射强迫的符号。大气顶净辐射的变化与净云辐射强迫的变化基本一致,总体以减少为主。对于地表气温的变化,REL和REI方案总体上有着较为一致的分布,夏季以降温为主,冬季的欧亚大陆中部和北美北部增温明显。此外,大陆地表气温的变化主要受地表热量输送的影响,而热带海洋上空却表现出明显的不一致性。同时引入可变的水云和冰云粒子(RIW和RIW_CAM3方案),云的消光光学厚度和辐射强迫相对单独引入主要呈线性响应,但地表气温表现出明显的非线性特征,非线性最明显的地区主要位于大陆地区。 Using NCC/IAP T63 atmosphere-ocean coupled model,its sensitivity to cloud droplet effective radius is analysed.Results show that the cloud extinction optical depth changes obviously in the lower part of troposphere when interactive liquid cloud droplet radius is introduced(REL and REL_CAM3 scheme),however,optical depth shows a distinct change with different position and sign between the two schemes,and it decreases remarkably in the upper troposphere when the interactive ice cloud droplet radius(REI scheme) is used.As a result,cloud radiative forcing changes remarkably,which is mainly affected by REI scheme,and shows a decrease trend for both short and long wave radiative forcing.The global-averaged net cloud radiative forcing at top of atmosphere is more sensitive to change of ice cloud droplet radius,but they both simulate the correct sign compared to ERA-40 data although large disparities exist in magnitude.The change of net radiation at top of atmosphere is basically consistent with that of net cloud radiative forcing,generally characterized by decrease.The change of surface air temperature(TAS) shows consistent distribution basically between REL and REI scheme,that is,TAS mainly decreases in summer,and it increases obviously in the middle of Eurasian continent and north of North America.In the continent the TAS change is mainly affected by the transportation of surface heat to atmosphere,but that is inconsistent in the ocean area.When interactive liquid and ice cloud droplet radius are introduced together(RIW and RIW_CAM3 scheme),TAS shows remarkable nonlinear response(mostly locating in continental area),contrast to the quasi-linear response of optical depth and cloud radiative forcing.
作者 汪方 丁一汇 徐影 WANG Fang1,2,DING Yi-Hui2,and XU Ying2 1 Laboratory for Climate Studies,National Cimate Center, China Meteorological Administration,Beijing 100081 2 National Climate Center,Beijing 100081
出处 《气候与环境研究》 CSCD 北大核心 2007年第6期 761-772,共12页 Climatic and Environmental Research
基金 2006年度中国气象局气候变化专项CCSF2006-7
关键词 海气耦合模式 云滴有效半径 敏感性 非线性响应 atmosphere-ocean model,cloud droplet effective radius,sensitivity,nonlinear response
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