ESA's Aeolus Mission Reveals Uncertainties in Tropical Wind and Wave-Driven Circulations

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-04-25 DOI:10.1029/2025GL114832

N. Žagar, R. Pilch Kedzierski, G. De Chiara, S. Healy, M. Rennie, F. Sielmann

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Abstract

The recent European Space Agency Aeolus mission provided global coverage of horizontal line-of-sight (HLOS) wind profiles. Using observing system experiments with HLOS winds in the ECMWF data assimilation system, we quantify the effects of HLOS winds on wave circulation and the mean zonal state in the tropical upper troposphere and lower stratosphere (UTLS) in relation to the background shear. Despite large observation random errors, the assimilation of HLOS winds produced substantial effects on Kelvin and $n = 1$ Rossby wave zonal winds, and, through 4D-Var, on mixed Rossby-gravity waves. The effects are asymmetric in easterlies and westerlies, consistent with the background shear. The largest analysis differences due to HLOS winds occurred during the 2019/2020 disruption of the quasi-biennial oscillation. The results highlight the importance of observing shear zones within the UTLS for reducing tropical analysis uncertainties.

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欧空局的Aeolus任务揭示了热带风和波浪驱动环流的不确定性

最近欧洲空间局的Aeolus任务提供了全球水平视距（HLOS）风廓线的覆盖范围。利用ECMWF资料同化系统中HLOS风的观测系统实验，量化了HLOS风对热带对流层上层和平流层下层（UTLS）波浪环流和平均纬向状态与背景切变的关系。尽管观测随机误差很大，但HLOS风的同化对开尔文和n=1$ n=1$罗斯比波纬向风产生了实质性影响，并通过4D-Var对混合罗斯比重力波产生了实质性影响。东风带和西风带的影响是不对称的，与背景切变一致。HLOS风造成的最大分析差异发生在准两年一次振荡的2019/2020年中断期间。结果强调了在UTLS内观测切变带对于减少热带分析不确定性的重要性。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.