气候变化领域集成服务门户(CCPortal): Seasonal changes of the South American monsoon system during the Mid-Holocene in the CMIP5 simulations

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DOI	10.1007/s00382-020-05137-1
	Seasonal changes of the South American monsoon system during the Mid-Holocene in the CMIP5 simulations
	Shimizu M.H.; Sampaio G.; Venancio I.M.; Maksic J.
发表日期	2020
ISSN	0930-7575
起始页码	2697
结束页码	2712
卷号	54
英文摘要	The South American Monsoon System (SAMS) is a major climatic feature of South America, and its domain extends from Amazon to La Plata basin. The SAMS region is vulnerable to variations of climate and precipitation patterns, which could impact economic activities and lead to potential societal consequences. In the face of a warming future scenario, the importance of the study of the past climate with numerical simulations is to evaluate the climate models and to assure the reliability of future projections. Here we investigate the Mid-Holocene SAMS, evaluating changes in strength, life cycle and associated dynamical mechanisms in ten Earth System Models simulations. Our results show that the SAMS was weaker in the Mid-Holocene than in the pre-industrial climate in December–January–February (DJF), but stronger in September–October–November (SON). This is probably a consequence of insolation variations in the Mid-Holocene, which contributed to changes in the moisture flux from the Atlantic Ocean to the continent, the strength of the upper-level atmospheric circulation, and the amount of precipitation over the SAMS region. Moreover, we suggest that the life cycle of the SAMS was altered during the Mid-Holocene, with an earlier onset and demise. Our results also indicate that Mid-Holocene SAMS changes are connected to precipitation variations near Northeast Brazil, in a dipole configuration of precipitation between western Amazon and Northeast Brazil, due to the influence of the Walker cell. Finally, this study highlights a need for improvement of the numerical models to better simulate the amount of precipitation over South America and the upper-level circulation over western Amazon in SON, which are crucial factors for a more realistic representation of the SAMS. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Climate change; CMIP5; Mid-Holocene; South American monsoon system
语种	英语
scopus关键词	climate change; climate modeling; CMIP; Holocene; monsoon; paleoclimate; precipitation (climatology); reliability analysis; seasonal variation; La Plata Basin; South America
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/145573
作者单位	Center for Weather Forecasting and Climate Studies, National Institute for Space Research, Cachoeira Paulista, São Paulo, Brazil
推荐引用方式 GB/T 7714	Shimizu M.H.,Sampaio G.,Venancio I.M.,et al. Seasonal changes of the South American monsoon system during the Mid-Holocene in the CMIP5 simulations[J],2020,54.
APA	Shimizu M.H.,Sampaio G.,Venancio I.M.,&Maksic J..(2020).Seasonal changes of the South American monsoon system during the Mid-Holocene in the CMIP5 simulations.Climate Dynamics,54.
MLA	Shimizu M.H.,et al."Seasonal changes of the South American monsoon system during the Mid-Holocene in the CMIP5 simulations".Climate Dynamics 54(2020).