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首页> 外文期刊>Climate dynamics >Summertime atmosphere-sea ice coupling in the Arctic simulated by CM IP 5/6 models: Importance of large-scale circulation
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Summertime atmosphere-sea ice coupling in the Arctic simulated by CM IP 5/6 models: Importance of large-scale circulation

机译：夏令时气氛 - 海冰耦合在CM IP 5/6模拟的北极模拟：大规模循环的重要性

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摘要

Summertime barotropic high pressure in the Arctic and its induced warmer and wetter atmosphere over sea ice are suggested to be important contributors to September sea ice loss on interannual and interdecadal time scales in the past decades. Using ERA5 and other reanalysis data, we find that atmospheric warming and moistening in the Arctic, synchronized by high latitude atmospheric circulation variability, work in tandem to melt sea ice through increasing downwelling longwave radiation at the surface. To what extent this atmosphere-longwave radiation-sea ice relationship can be captured in CMIP5 and 6 remains unknown and thus addressing this question is the objective of this study. To achieve this goal, we construct a process-oriented metric emphasizing the statistical relationship between atmospheric temperature and humidity with sea ice, which can effectively rank and differentiate the performance of 30 CMIP5 climate models in reproducing the observed connection. Based on our evaluation, we suggest that most available models in CMIP5 and 6 have a limitation in reproducing the full strength of the observed atmosphere-sea ice connection. This limitation likely stems from a weak impact of downwelling longwave radiation in linking sea ice with circulation associated with the weak sensitivity of the temperature and humidity fields to circulation variability in the Arctic. Thus, further efforts should be devoted to understanding the sources of these models' limitations and improve skill in simulating the effects of atmospheric circulation in coupling temperature, humidity, surface radiation and sea ice together during Arctic summer.
机译：夏令时，北极的波奇波特高压及其诱导的海冰湿润和潮湿的气氛被认为是过去几十年来对9月和跨国时间尺度的九月海冰损失的重要贡献者。使用ERA5和其他再分析数据，我们发现北极大气变暖和湿润，通过高纬度大气循环变异性同步，在串联中工作，通过增加表面的漫长的长波辐射来融化海冰。在多大程度上可以在多大程度上在CMIP5和6中捕获龙波辐射海冰关系，因此仍然未知，因此解决了这个问题是本研究的目的。为了实现这一目标，我们构建了一种以海冰的大气温度和湿度之间的统计关系构建了一个过程导向的度量，这可以有效地等级，分辨在再现观察到的连接时30个CMIP5气候模型的性能。根据我们的评价，我们建议在CMIP5和6中的大多数可用模型在再现观察到的大气海冰连接的全部强度方面具有限制。这种限制可能源于贫困龙波辐射在将海冰与循环与温度和湿度弱相关的循环相关的弱势影响，以至于北极的循环变异性。因此，应致力于了解这些模型的局限性来源的进一步努力，提高北极夏季在北极夏季偶联温度，湿度，表面辐射和海冰中的大气循环的影响。

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  • 来源
    《Climate dynamics》 |2021年第6期|1467-1485|共19页
  • 作者

    Luo Rui; Ding Qinghua; Wu Zhiwei; Baxter Ian; Bushuk Mitchell; Huang Yiyi; Dong Xiquan;

  • 作者单位

    Fudan Univ Inst Atmospher Sci Dept Atmospher & Ocean Sci Shanghai 200438 Peoples R China|Univ Calif Santa Barbara Dept Geog Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Earth Res Inst Santa Barbara CA 93106 USA;

    Univ Calif Santa Barbara Dept Geog Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Earth Res Inst Santa Barbara CA 93106 USA;

    Fudan Univ Inst Atmospher Sci Dept Atmospher & Ocean Sci Shanghai 200438 Peoples R China;

    Univ Calif Santa Barbara Dept Geog Santa Barbara CA 93106 USA|Univ Calif Santa Barbara Earth Res Inst Santa Barbara CA 93106 USA;

    Geophys Fluid Dynam Lab Princeton NJ 08540 USA;

    Univ Arizona Dept Hydrol & Atmospher Sci Tucson AZ 85721 USA;

    Univ Arizona Dept Hydrol & Atmospher Sci Tucson AZ 85721 USA;

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