A momentum budget study of the semi‐annual oscillation in the Whole Atmosphere Community Climate Model

IF 3 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Quarterly Journal of the Royal Meteorological Society Pub Date : 2024-07-22 DOI:10.1002/qj.4782

Aleena M. Jaison, Lesley J. Gray, Scott Osprey, Anne K. Smith, Rolando R. Garcia

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Abstract

The representation of the semi‐annual oscillation (SAO) in climate models shows a common easterly bias of several tens of metres per second compared to observations. These biases could be due to deficiencies in eastward tropical wave forcing, the position or strength of the climatological summertime jet or the strength/timing of the Brewer–Dobson circulation. This motivates further analysis of the momentum budget of the upper stratosphere within models and a more detailed comparison with reanalyses to determine the origin of the bias. In this study, the transformed Eulerian mean momentum equation is used to evaluate the different forcing terms that contribute to the SAO in the MERRA2 reanalysis dataset. This is then compared with the equivalent analysis using data from a climate simulation of the Whole Atmosphere Community Climate Model (WACCM). The comparison shows that WACCM underestimates eastward forcing by both resolved and parameterised waves at equatorial latitudes when compared with MERRA2 and also has a weaker tropical upwelling above 1 hPa.

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全大气社区气候模型中的半年涛动动量预算研究

与观测结果相比，气候模式对半年涛动（SAO）的表示普遍存在每秒几十米的偏东现象。这些偏差可能是由于东向热带波强迫、气候学夏季喷流的位置或强度或布鲁尔-多布森环流的强度/时间不足造成的。这就需要进一步分析模式内平流层上部的动量预算，并与再分析进行更详细的比较，以确定偏差的起源。在这项研究中，使用转换的欧拉平均动量方程来评估 MERRA2 再分析数据集中导致 SAO 的不同强迫项。然后将其与使用全大气群落气候模式（WACCM）气候模拟数据进行的等效分析进行比较。比较结果表明，与 MERRA2 相比，WACCM 低估了赤道纬度的解析波和参数化波的东向强迫，而且 1 hPa 以上的热带上升流也较弱。

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来源期刊

Quarterly Journal of the Royal Meteorological Society 地学-气象与大气科学

CiteScore

16.80

自引率

4.50%

发文量

163

审稿时长

3-8 weeks

期刊介绍： The Quarterly Journal of the Royal Meteorological Society is a journal published by the Royal Meteorological Society. It aims to communicate and document new research in the atmospheric sciences and related fields. The journal is considered one of the leading publications in meteorology worldwide. It accepts articles, comprehensive review articles, and comments on published papers. It is published eight times a year, with additional special issues. The Quarterly Journal has a wide readership of scientists in the atmospheric and related fields. It is indexed and abstracted in various databases, including Advanced Polymers Abstracts, Agricultural Engineering Abstracts, CAB Abstracts, CABDirect, COMPENDEX, CSA Civil Engineering Abstracts, Earthquake Engineering Abstracts, Engineered Materials Abstracts, Science Citation Index, SCOPUS, Web of Science, and more.