气候变化领域集成服务门户(CCPortal): Interdecadal changes in Southern Hemisphere winter explosive storms and Southern Australian rainfall

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DOI	10.1007/s00382-021-05633-y
	Interdecadal changes in Southern Hemisphere winter explosive storms and Southern Australian rainfall
	Osbrough S.L.; Frederiksen J.S.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-09-10
英文摘要	Interdecadal changes, over the last seventy years, in winter synoptic weather systems that grow and decay in the extratropical storm tracks of the Southern Hemisphere are investigated. The statistics of the intensity of growing and decaying eddies, and their preferred structures and growth rates, are determined from 6-hourly lower-tropospheric reanalysis data for high-pass filtered (period less than 4 days) and band-pass filtered (period between 4 and 8 days) disturbances. A new data-driven methodology is used in which the perturbations are spectrally analysed in both space and time, their growth rates are calculated and statistics are accumulated for growing and decaying instabilities. Rainfall variability in Southern Australia is found to be closely related to the changing statistics of weather system intensity and to interannual and decadal variability in indices or predictors that characterize local, hemispheric or global aspects of the atmospheric circulation. In investigations into the mid-1970s drying of southwestern Western Australia, the Australian Millennium Drought and Southern Australian rainfall anomalies of the early twenty-first century it is found that decadal changes in rainfall are most related to the intensity of the fast growing weather systems. Two new indices, the Subtropical Atmospheric Jet (SAJ) index and the Southern Ocean Regional Dipole (SORD) index, are introduced and shown to have some skill in characterizing aspects of Southern Australian winter rainfall variability particularly on decadal timescales. © 2021, Crown.
英文关键词	Climate change; Decadal variability; Droughts; Rainfall; Storms
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183298
作者单位	CSIRO Oceans and Atmosphere, Aspendale, VIC 3195, Australia; Monash University, Clayton, VIC, Australia
推荐引用方式 GB/T 7714	Osbrough S.L.,Frederiksen J.S.. Interdecadal changes in Southern Hemisphere winter explosive storms and Southern Australian rainfall[J],2021,56(2021-09-10).
APA	Osbrough S.L.,&Frederiksen J.S..(2021).Interdecadal changes in Southern Hemisphere winter explosive storms and Southern Australian rainfall.Climate Dynamics,56(2021-09-10).
MLA	Osbrough S.L.,et al."Interdecadal changes in Southern Hemisphere winter explosive storms and Southern Australian rainfall".Climate Dynamics 56.2021-09-10(2021).