气候变化领域集成服务门户(CCPortal): Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses

CCPortal

DOI	10.1029/2020GL090139
	Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses
	Hsiao W.-T.; Maloney E.D.; Barnes E.A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Recent work using CMIP5 models under RCP8.5 suggests that individual multimodel mean changes in precipitation and wind variability associated with the Madden-Julian oscillation (MJO) are not detectable until the end of the 21st century. However, a decrease in the ratio of MJO circulation to precipitation anomaly amplitude is detectable as early as 2021–2040, consistent with an increase in dry static stability as predicted by weak temperature gradient balance. Here, we examine MJO activity in multiple reanalyses (ERA5, MERRA-2, and ERA-20C) and find that MJO wind and precipitation anomaly amplitudes have a complicated time evolution over the record. However, a decrease in the ratio of MJO circulation to precipitation anomaly amplitude is detected over the observational period, consistent with the change in dry static stability. These results suggest that weak temperature gradient theory may be able to help explain changes in MJO activity in recent decades. ©2020. The Authors.
英文关键词	Thermal gradients; Madden-Julian oscillation; Multi-model; Precipitation anomalies; Static stability; Time evolutions; Wind variabilities; Climatology; air-sea interaction; amplitude; anomaly; atmospheric circulation; CMIP; Madden-Julian oscillation; precipitation assessment; temperature gradient; wind profile
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169472
作者单位	Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Hsiao W.-T.,Maloney E.D.,Barnes E.A.. Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses[J],2020,47(22).
APA	Hsiao W.-T.,Maloney E.D.,&Barnes E.A..(2020).Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses.Geophysical Research Letters,47(22).
MLA	Hsiao W.-T.,et al."Investigating Recent Changes in MJO Precipitation and Circulation in Multiple Reanalyses".Geophysical Research Letters 47.22(2020).