气候变化领域集成服务门户(CCPortal): The influence of south pacific convergence zone heating on the south pacific subtropical anticyclone

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DOI	10.1175/JCLI-D-20-0509.1
	The influence of south pacific convergence zone heating on the south pacific subtropical anticyclone
	Fahad A.A.; Burls N.J.; Swenson E.T.; Straus D.M.
发表日期	2021
ISSN	08948755
起始页码	3787
结束页码	3798
卷号	34 期号:10
英文摘要	Subtropical anticyclones and midlatitude storm tracks are key components of the large-scale atmospheric circulation. Focusing on the Southern Hemisphere, the seasonality of the three dominant subtropical anticyclones, situated over the South Pacific, South Atlantic, and south Indian Ocean basins, has a large influence on local weather and climate within South America, southern Africa, and Australia, respectively. Generally speaking, sea level pressure within the Southern Hemisphere subtropics reaches its seasonal maximum during the winter season when the Southern Hemisphere Hadley cell is at its strongest. One exception to this is the seasonal evolution of the South Pacific subtropical anticyclone. While winter maxima are seen in the South Atlantic and south Indian subtropical anticyclones, the South Pacific subtropical anticyclone reaches its seasonal maximum during local spring with elevated values extending into summer. In this study, we investigate the hypothesis that the strength of the austral summer South Pacific subtropical anticyclone is largely due to heating over the South Pacific convergence zone. Using added-cooling and added-heating atmospheric general circulation model experiments to artificially change the strength of austral summer diabatic heating over the South Pacific convergence zone, our results show that increased heating, through increased upper-level divergence, triggers a Rossby wave train that extends into the Southern Hemisphere midlatitudes. This propagating Rossby wave train creates a high and low sea level pressure pattern that projects onto the center of the South Pacific subtropical anticyclone to intensify its area and strength. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Anticyclones; Atmosphere-ocean interaction; Atmospheric circulation; Baroclinic flows; Cyclogenesis/ cyclolysis; Rossby waves
语种	英语
scopus关键词	Atmospheric pressure; Clouds; Heating; Mechanical waves; Meteorology; Salinity measurement; Sea level; American meteorological societies; Atmospheric circulation; Atmospheric general circulation models; Copyright informations; Mid-latitude storms; South pacific convergence zones; Southern Hemisphere; Subtropical anticyclone; Tropics
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/178559
作者单位	Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA, United States; Center for Ocean–Land–Atmosphere Studies, George Mason University, Fairfax, VA, United States
推荐引用方式 GB/T 7714	Fahad A.A.,Burls N.J.,Swenson E.T.,et al. The influence of south pacific convergence zone heating on the south pacific subtropical anticyclone[J],2021,34(10).
APA	Fahad A.A.,Burls N.J.,Swenson E.T.,&Straus D.M..(2021).The influence of south pacific convergence zone heating on the south pacific subtropical anticyclone.Journal of Climate,34(10).
MLA	Fahad A.A.,et al."The influence of south pacific convergence zone heating on the south pacific subtropical anticyclone".Journal of Climate 34.10(2021).