段升妮,姜智娜. 2021. 冬季北半球大气对秋冬季巴伦支海海冰异常的敏感性研究[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.018
冬季北半球大气对秋冬季巴伦支海海冰异常的敏感性研究
Sensitivity of Boreal Winter Atmosphere to Sea Ice Anomalies in Autumn and Winter over Barents Sea
投稿时间:2020-07-03  修订日期:2020-10-06
DOI:10.11676/qxxb2021.018
中文关键词:  巴伦支海,海冰异常,环流,气温
英文关键词:The Barents sea, Sea ice anomalies, Circulation, Temperature
基金项目:国家自然科学基金
作者单位邮编
段升妮 中国气象科学研究院灾害天气国家重点实验室 100081
姜智娜 中国气象科学研究院灾害天气国家重点实验室 100081
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中文摘要:
      [资料]基于ERA-Interim再分析资料,[模式]借助大气模式CAM4,[目的]分析了北半球冬季不同月份的平均大气对巴伦支海不同振幅及不同季节海冰扰动的敏感性,并考察了中高纬度典型大气模态的分布变化情况。[结果]结果表明,冬季巴伦支海海冰的减少,会导致湍流热通量异常向上,局地异常增暖及水汽含量的异常增加,且相关异常的强度和范围随着海冰偏少幅度的减小而减弱。这种局地响应会通过大气环流调整扩散开来,产生远程影响。具体地,冬季大气环流与欧亚地面温度异常对于不同幅度海冰异常的响应是非线性的,且在不同月份也呈现出不同特征。秋季巴伦支海海冰减少虽未引起局地显著的温度异常,但欧亚大陆温度及环流场异常响应的强度更强、范围更广,这表明秋季海冰可以独立地对冬季中纬度大气产生影响。此外,冬季季节内,不同月份西伯利亚高压强度、位置对巴伦支海海冰减少的响应是不一致的,北大西洋涛动(NAO)位相的倾向变化对不同季节、不同振幅海冰减少的响应也不相同。冬季海冰减少时,12月和1月,西伯利亚高压强度更易偏强、位置易偏东,2月则与之相反。与冬季相比,秋季海冰偏少时,西伯利亚高压更易稳定维持在欧亚大陆,晚冬时发生NAO负位相(NAO-)的概率增加,但出现极端NAO-的概率在减少。[结论]这为了解巴伦支海海冰异常对北半球天气、气候的影响提供了参考。
英文摘要:
      Based on the ERA-Interim reanalysis data, sensitivity of boreal winter atmosphere to sea ice anomalies with different amplitudes in Autumn and Winter over the Barents Sea is explored with the Community Atmosphere Model 4.0 (CAM4). Both the winter mean atmospheric responses and the typical modals at mid-high latitudes are studied. The results show that sea ice loss over Barents Sea in winter can generate anomalous upward turbulent heat flux, which warms the local lower atmosphere and increases local atmospheric moisture, whose magnitude and extent are consistent with the sea ice anomalies. Specifically, the responses of atmospheric circulation and surface air temperature over Eurasian continent are nonlinear and change with time. Although the reduction of the Barents Sea ice in autumn does not cause local significant temperature anomalies in winter, it leads to stronger and wider temperature and circulation anomalies over Eurasian continent. The results indicate that autumn sea ice change can affect the mid-latitude atmosphere in winter independently. In addition, the intensity and location of Siberian high and NAO phases in different months during winter have different responses to the reduction of the Barents Sea ice. In December and January, the Siberian high is easily to be stronger and more eastward with respect to winter sea ice loss over Barents Sea, which is reversed in February. However, with the sea ice loss in autumn, the Siberian high is more likely to be stationary. And the negative phase of North Atlantic Oscillation (NAO-) occurs more frequently in late winter, but strong NAO- occurs less frequently. This provides a guideline for understanding the impact of the Barents Sea ice loss on the weather and climate in the northern hemisphere.
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