气候变化领域集成服务门户(CCPortal): Investigating monthly geopotential height changes and mid-latitude Northern Hemisphere westerlies

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DOI	10.1007/s00704-024-04879-w
	Investigating monthly geopotential height changes and mid-latitude Northern Hemisphere westerlies
	Asakereh, Hossein; Jahedi, Arman; Faraji, Abdollah
发表日期	2024
ISSN	0177-798X
EISSN	1434-4483
英文摘要	The investigation of the height variations of the westerly in the mid-latitudes of the Northern Hemisphere is crucial for monitoring changes in the intricate atmospheric system. This study examined the hypothesis of changes in the thickness of the westerly domain by analyzing the height of the 500 hPa pressure level. To this end, monthly data from the European Centre for Medium-Range Weather Forecasts (ECMWF) spanning from 1959 to 2021 was utilized to investigate three components: geopotential height (GH), zonal, and meridional wind components. The dataset underwent statistical tests, including trend analysis using Least Squares Error linear regression (LSE-LR) and shift (jump) analysis using the Standard Normal Homogeneity Test (SNHT). The results revealed a significant increasing trend in the height of the troposphere and the westerlies in the mid-latitudes of the Northern Hemisphere, accompanied by significant fluctuations, indicating an increase in the height of the 500 hPa pressure level and a decrease in the thickness of the westerly domain. The extent of these trends was observed to be greater in cold months, particularly in January and February, while the changes were minimal in November. Notably, the spatial distribution of upward jumps, indicative of change, was highest in January, July, and August in the eastern and southeastern regions of Asia. Furthermore, the convergence section of the westerlies trough exhibited a substantial number of jumps, particularly in March, spanning Central America and southern parts of North America. Regarding decadal coincidence onset, the highest number of jumps occurred in February, encompassing the western Pacific Ocean, western Atlantic Ocean, Eastern Europe, and western Asia. The end of these jumps coincided in February, and the spatial proximity of the end times was closer compared to the onset times in February, March, April, July, and August.
英文关键词	Westerlies; Mid-latitudes; Northern Hemisphere; Geopotential height; Trend; Jump
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001163791000002
来源期刊	THEORETICAL AND APPLIED CLIMATOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303443
作者单位	University Zanjan
推荐引用方式 GB/T 7714	Asakereh, Hossein,Jahedi, Arman,Faraji, Abdollah. Investigating monthly geopotential height changes and mid-latitude Northern Hemisphere westerlies[J],2024.
APA	Asakereh, Hossein,Jahedi, Arman,&Faraji, Abdollah.(2024).Investigating monthly geopotential height changes and mid-latitude Northern Hemisphere westerlies.THEORETICAL AND APPLIED CLIMATOLOGY.
MLA	Asakereh, Hossein,et al."Investigating monthly geopotential height changes and mid-latitude Northern Hemisphere westerlies".THEORETICAL AND APPLIED CLIMATOLOGY (2024).