Strengthening Southern Hemisphere Westerlies and Amundsen Sea Low Deepening Over the 20th Century Revealed by Proxy‐Data Assimilation

Strengthening Southern Hemisphere Westerlies and Amundsen Sea Low Deepening Over the 20th Century Revealed by Proxy‐Data Assimilation
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代理数据同化揭示了 20 世纪南半球西风带和阿蒙森海低压加深的加强

DOI:
10.1029/2021gl095999
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发表时间:
2021
影响因子:
5.2
通讯作者:
G. Hakim
G. Hakim
中科院分区:
地球科学1区
文献类型:
--
作者:
G. O’Connor;E. Steig;G. Hakim

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南大洋上的风和压力对气候系统的许多方面都至关重要,但该地区气候数据的短暂性使得解释最近的变化具有挑战性。在这里,我们重建20世纪世纪的海平面压力和纬向表面风异常在南大洋,使用数据同化与全球古气候代理数据库和四个气候模型先验。重建结果与仪器再分析结果吻合较好,特别是在绕极西风区和太平洋区。在整个世纪的四次重建中,我们观察到中纬度太平洋西风带的显著加强,与阿蒙森海低压的加深有关。当先验包括人为强迫时,我们观察到整个世纪向极移动的绕极西风。我们的研究结果强调了自然变率和人为强迫的综合作用,以及南半球高纬度地区大气环流变化的纬向不对称特征,对南极冰盖变化的影响。
Winds and pressure over the Southern Ocean are critical to many aspects of the climate system, but the brevity of climate data in this region makes it challenging to interpret recent changes. Here, we reconstruct 20th century sea level pressure and zonal surface wind anomalies over the Southern Ocean, using data assimilation with a global paleoclimate proxy database and four climate‐model priors. The reconstructions agree well with instrumental reanalysis products, especially in the circumpolar westerly and Pacific regions. We observe significant strengthening in the midlatitude Pacific westerlies, associated with a deepening Amundsen Sea Low, throughout the 20th century in all four reconstructions. When the prior includes anthropogenic forcing, we observe poleward‐shifting circumpolar westerlies throughout the 20th century. Our results highlight the combined roles of natural variability and anthropogenic forcing, and the zonally asymmetric character of atmospheric circulation changes at high southern latitudes, with implications for Antarctic ice sheet change.
气候模型遥相关模式控制 Niño-3.4 对基于珊瑚的数据同化重建中十九世纪早期火山活动的响应
DOI: 10.1175/jcli-d-20-0549.1
发表时间: 2021
期刊: Journal of Climate
影响因子: 4.9
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影响因子: 8
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