气候变化领域集成服务门户(CCPortal): Links between Large-Scale Modes of Climate Variability and Synoptic Weather Patterns in the Southern Indian Ocean

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DOI	10.1175/JCLI-D-20-0297.1
	Links between Large-Scale Modes of Climate Variability and Synoptic Weather Patterns in the Southern Indian Ocean
	Udy D.G.; Vance T.R.; Kiem A.S.; Holbrook N.J.; Curran M.A.J.
发表日期	2021
ISSN	0894-8755
起始页码	883
结束页码	899
卷号	34 期号:3
英文摘要	Weather systems in the southern Indian Ocean (SIO) drive synoptic-scale precipitation variability in East Antarctica and southern Australia. Improved understanding of these dynamical linkages is beneficial to diagnose long-term climate changes from climate proxy records as well as informing regional weather and climate forecasts. Self-organizing maps (SOMs) are used to group daily 500-hPa geopotential height (z500; ERA-Interim) anomalies into nine regional synoptic types based on their dominant patterns over the SIO (308–758S, 408–1808E) from January 1979 to October 2018. The pattern anomalies represented include four meridional, three mixed meridional–zonal, one zonal, and one transitional node. The frequency of the meridional nodes shows limited association with the phase of the southern annular mode (SAM), especially during September–November. The zonal and mixed patterns were nevertheless strongly and significantly correlated with SAM, although the regional synoptic representation of SAM1 conditions was not zonally symmetric and was represented by three separate nodes. We recommend consideration of how different synoptic conditions vary the atmospheric representation of SAM1 in any given season in the SIO. These different types of SAM1 mean a hemispheric index fails to capture the regional variability in surface weather conditions that is primarily driven by the synoptic variability rather than the absolute polarity of the SAM. Ó 2020 American Meteorological Society.
英文关键词	Climate change; Conformal mapping; Precipitation (meteorology); Self organizing maps; American meteorological societies; Geo-potential heights; Regional variability; Self organizing maps(soms); Southern Annular Mode; Southern indian ocean; Surface weather conditions; Synoptic weather patterns; Weather forecasting
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170925
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; ARC Centre of Excellence for Climate Extremes, University of Tasmania, Hobart, TAS, Australia; Australian Antarctic Program Partnership, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; Centre for Water, Climate and Land, Faculty of Science, University of Newcastle, Callaghan, NSW, Australia; Australian Antarctic Division, Kingston, TAS, Australia
推荐引用方式 GB/T 7714	Udy D.G.,Vance T.R.,Kiem A.S.,et al. Links between Large-Scale Modes of Climate Variability and Synoptic Weather Patterns in the Southern Indian Ocean[J],2021,34(3).
APA	Udy D.G.,Vance T.R.,Kiem A.S.,Holbrook N.J.,&Curran M.A.J..(2021).Links between Large-Scale Modes of Climate Variability and Synoptic Weather Patterns in the Southern Indian Ocean.Journal of Climate,34(3).
MLA	Udy D.G.,et al."Links between Large-Scale Modes of Climate Variability and Synoptic Weather Patterns in the Southern Indian Ocean".Journal of Climate 34.3(2021).