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DOI	10.1038/s41561-021-00811-3
	Zonal wave 3 pattern in the Southern Hemisphere generated by tropical convection
	Goyal R.; Jucker M.; Sen Gupta A.; Hendon H.H.; England M.H.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:10
英文摘要	A distinctive feature of the Southern Hemisphere extratropical atmospheric circulation is the quasi-stationary zonal wave 3 pattern. This pattern is present in both the mean atmospheric circulation and its variability on daily, seasonal and interannual timescales. While the zonal wave 3 pattern has substantial impacts on meridional heat transport and Antarctic sea ice extent, the reason for its existence remains uncertain, although it has long been assumed to be linked to the presence of three major landmasses in the Southern Hemisphere extratropics. Here we use an atmospheric general circulation model to show that the stationary zonal wave 3 pattern is instead driven by zonally asymmetric deep convection in the tropics, with little influence from extratropical orography or landmasses. Localized regions of deep convection in the tropics form a local Hadley cell, which in turn creates a wave source in the subtropics that excites a poleward- and eastward-propagating wave train, forming quasi-stationary waves in the Southern Hemisphere high latitudes. Our findings suggest that changes in tropical deep convection, either due to natural variability or climate change, fundamentally control the zonal wave 3 pattern, with implications for southern high-latitude climate, ocean circulation and sea ice. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	atmospheric circulation; climate change; convection; sea ice; Southern Hemisphere
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250864
作者单位	Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW, Australia; Australian Centre for Excellence in Antarctic Science (ACEAS), University of New South Wales, Sydney, NSW, Australia; Bureau of Meteorology, Melbourne, VIC, Australia
推荐引用方式 GB/T 7714	Goyal R.,Jucker M.,Sen Gupta A.,et al. Zonal wave 3 pattern in the Southern Hemisphere generated by tropical convection[J],2021,14(10).
APA	Goyal R.,Jucker M.,Sen Gupta A.,Hendon H.H.,&England M.H..(2021).Zonal wave 3 pattern in the Southern Hemisphere generated by tropical convection.Nature Geoscience,14(10).
MLA	Goyal R.,et al."Zonal wave 3 pattern in the Southern Hemisphere generated by tropical convection".Nature Geoscience 14.10(2021).