气候变化领域集成服务门户(CCPortal): Atmospheric characteristics favorable for the development of mesoscale convective complexes in southern Brazil

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DOI	10.3354/CR01595
	Atmospheric characteristics favorable for the development of mesoscale convective complexes in southern Brazil
	Moraes F.D.S.; Aquino F.E.; Mote T.L.; Durkee J.D.; Mattingly K.S.
发表日期	2020
ISSN	0936-577X
起始页码	43
结束页码	58
卷号	80 期号:1
英文摘要	Mesoscale convective complexes (MCCs) are meteorological events that result in severe storms, hail, flood, and tornadoes, but they are difficult to forecast. In South America (SA), MCCs are usually larger and last longer than those in the USA. Southern Brazil (SB) is one of their preferred regions of occurrence. This study’s objective was to contribute to the identification of the main physical characteristics and atmospheric environment that favors the occurrence of MCCs in SB and determine how these events are unique relative to other subtropical SA (OSSA) regions. Results indicate that SB MCCs last longer (+ 3 h) and their average maximum extent is at least 50 000 km2 larger than OSSA MCCs. The atmospheric environment of SB MCCs meets the criteria already indicated in previous studies, with the northerly low-level jet (LLJ), which brings humidity from the Amazon Basin to the SB MCCs genesis area, coupling with the upper-level jet (ULJ). Moreover, SB MCCs have the South Atlantic as their second source of moisture, which is advected by anticyclonic circulation in the southwestern South Atlantic. This indicates that SB MCCs have unique characteristics compared to OSSA MCCs, including 2 main atmospheric circulation systems responsible for moisture advection to the SB genesis region. For comparison, OSSA MCCs are more dependent on the South Atlantic Convergence Zone (SACZ) and the advection of moisture by the LLJ from the Amazon Basin to north-central Argentina and west-central and southeast Brazil. © Inter-Research 2020
英文关键词	Climate South America; Extreme climate events; Mesoscale convective systems; Southern Brazil
语种	英语
scopus关键词	air-sea interaction; anticyclone; atmosphere-ocean coupling; atmospheric circulation; atmospheric convection; mesoscale eddy; Amazon Basin; Argentina; Atlantic Ocean; Atlantic Ocean (South); Brazil; United States
来源期刊	Climate Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146891
作者单位	Department of Geography, University of Georgia, Athens, GA 30602, United States; Department of Geography, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91509-900, Brazil; Department of Geography and Geology, Western Kentucky University, Bowling Green, KY 42101, United States; Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers, the State University of New Jersey, New Brunswick, NJ 08901, United States
推荐引用方式 GB/T 7714	Moraes F.D.S.,Aquino F.E.,Mote T.L.,et al. Atmospheric characteristics favorable for the development of mesoscale convective complexes in southern Brazil[J],2020,80(1).
APA	Moraes F.D.S.,Aquino F.E.,Mote T.L.,Durkee J.D.,&Mattingly K.S..(2020).Atmospheric characteristics favorable for the development of mesoscale convective complexes in southern Brazil.Climate Research,80(1).
MLA	Moraes F.D.S.,et al."Atmospheric characteristics favorable for the development of mesoscale convective complexes in southern Brazil".Climate Research 80.1(2020).