BCC_CSM北极海冰模拟性能的改进对东亚冬季气候模拟的影响
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1.成都信息工程大学;2.国家气候中心;3.中国气象科学研究院

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Impact of BCC_CSM Arctic Sea Ice Simulation Improvement on East Asian Winter Climate Simulation
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1.Chengdu University of Information Technology;2.National Climate Center;3.Chinese Academy of Meteorological Sciences

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    摘要:

    国家气候中心气候系统模式(BCC_CSM)将美国Los Alamos国家实验室发展的海冰模式CICE5.0替代原有的海冰模式SIS,形成一个新版本耦合模式,很好地提高了模式对北极海冰和北极气候的模拟能力。在此基础上,本文评估新耦合模式对1985-2014年东亚冬季气候的模拟性能,检验北极海冰模拟性能的改进对东亚冬季气候模拟性能的影响。结果表明,引入CICE5.0后,新耦合模式能较好地模拟出东亚冬季海平面气压、850hPa风场以及辐射通量,进而改善东亚气温以及降水的气候态空间分布模拟效果。进一步分析发现,与原有耦合模式相比,新耦合模式更好地抓住了东亚冬季海平面气压、总降水量和气温异常对同期巴伦支海-喀拉海海冰密集度异常的响应,进而提高了模式对东亚冬季中高纬度地区气温以及降水变率的模拟能力。

    Abstract:

    The Los Alamos Sea Ice Model 5.0 (CICE5.0) was introduced to the Beijing Climate Center Climate System Model (BCC_CSM) as a new alternative to the Sea Ice Simulator (SIS). The new coupled model performance on the Arctic sea ice and polar climate simulations has been satisfactorily improved. In the study, we evaluate the East Asian winter climate modeling capability during 1985-2014 of the new coupled model through a comparison to both the original version and observations, analyzing the impacts of the improved Arctic sea ice simulation on the simulations of East Asian winter climate. The results show that the new coupled model can effectively improve the spatial patterns of the East Asian winter Sea level pressure, 850hPa Wind field and radiant flux simulations, which can reasonably improve the East Asian winter temperature and precipitation simulations at mid-high latitudes. Further analysis indicates that, compared with the original version, the new one significantly captures the spatial pattern of the correlations between winter Barents-Kara Sea ice and the climate elements in East Asia of observations, including Sea level pressure, temperature and precipitation, which further improves the winter temperature and precipitation variability simulations at the mid-high latitudes of East Asia.

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  • 收稿日期:2020-11-03
  • 最后修改日期:2020-11-28
  • 录用日期:2021-03-25
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