The Summer North Atlantic Oscillation, Arctic sea ice, and Arctic jet Rossby wave forcing

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2024-11-13 DOI:10.1126/sciadv.adk6693

Chris K. Folland, Tinghai Ou, Hans W. Linderholm, Adam A. Scaife, Jeff Knight, Deliang Chen

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引用次数: 0

Abstract

We use Coupled Model Intercomparison Project Phase 6 (CMIP6) coupled and Atmospheric Model Intercomparison Project (AMIP) climate models, dynamical analyses, and observations to investigate interactions between summer Arctic sea ice concentration (SIC) variations and the Summer North Atlantic Oscillation (SNAO). Observations suggest that SIC-SNAO relationships mainly come from the East Siberian to Arctic Canada (ESAC) region where a weak atmospheric jet stream exists in summer. Twelve CMIP6 models with the most realistic atmospheric climatologies over the North Atlantic and Europe agree well with reanalyses on relationships between SIC and Northern Hemisphere atmospheric circulation. CMIP6 model data indicate that ESAC SIC influences the SNAO with a lead time of several weeks. However, AMIP simulations do not reproduce the observed atmospheric circulation when observed sea ice is prescribed. Rossby wave analyses do though support observed ESAC SIC influences on the SNAO. We conclude that ESAC Arctic SIC modestly influences the SNAO, and such investigations require the use of coupled models.

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夏季北大西洋涛动、北极海冰和北极喷流罗斯比波强迫作用

我们利用耦合模式相互比较项目第 6 阶段（CMIP6）耦合气候模式和大气模式相互比较项目（AMIP）气候模式、动力学分析和观测资料，研究夏季北极海冰浓度（SIC）变化与夏季北大西洋涛动（SNAO）之间的相互作用。观测结果表明，SIC-SNAO 关系主要来自东西伯利亚至加拿大北极地区（ESAC），该地区夏季存在微弱的大气喷流。在北大西洋和欧洲上空，12 个 CMIP6 模式具有最真实的大气气候学特征，在 SIC 与北半球大气环流关系方面与再分析结果非常一致。CMIP6 模式数据表明，ESAC SIC 对 SNAO 的影响提前了几周。然而，当观测到海冰时，AMIP 模拟并不能再现观测到的大气环流。尽管罗斯比波分析支持观测到的 ESAC SIC 对 SNAO 的影响。我们的结论是，ESAC 北极 SIC 对 SNAO 的影响不大，此类研究需要使用耦合模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.