气候变化领域集成服务门户(CCPortal): Sub-monthly evolution of the Caribbean Low-Level Jet and its relationship with regional precipitation and atmospheric circulation

CCPortal

DOI	10.1007/s00382-020-05237-y
	Sub-monthly evolution of the Caribbean Low-Level Jet and its relationship with regional precipitation and atmospheric circulation
	García-Martínez I.M.; Bollasina M.A.
发表日期	2020
ISSN	0930-7575
起始页码	4423
结束页码	4440
卷号	54
英文摘要	The summer spatial structure and sub-monthly temporal evolution of one of the key dynamical features of Central American climate, the Caribbean Low-Level Jet (CLLJ), is investigated by means of extended empirical orthogonal functions (EEOFs). The Caribbean 925-hPa zonal wind from the CFSR reanalysis for the period 1979 – 2010 is used for the analysis. This approach reveals new insights into the dynamical processes and spatio-temporal evolution of the CLLJ summer intensification, and through lead and lag linear regressions, significant climate links in the broader Caribbean region are identified. The results show that the CLLJ generates significant precipitation and temperature responses with a distinct temporal evolution over the Caribbean-Atlantic domain to that over the tropical Pacific, which hints at different underlying controlling mechanisms over these two large-scale regions. These anomalies are linked with the mid and upper tropospheric circulation, where a vertical cell over the Caribbean (ascending at the jet exit and subsiding at its entrance) varies in phase with large-scale divergence over the Pacific Ocean. Extratropical hemispheric-wide waves and the weakening of a thermal low in northeast Mexico-central US are identified as potential triggering factors for the CLLJ summer intensification. Two leading modes of tropical variability, El Niño Southern Oscillation and the Madden-Julian Oscillation, are found to modulate the CLLJ by intensifying it and prolonging its life cycle. Details of the underlying mechanisms are provided. These results help to advance the understanding of the processes that modulate local climate variations, which is an important issue in view of the rapid climate change the region is undergoing. © 2020, The Author(s).
英文关键词	Caribbean Low-Level Jet; Extended empirical orthogonal functions; Mexico and Central America; Precipitation
语种	英语
scopus关键词	atmospheric circulation; atmospheric dynamics; El Nino-Southern Oscillation; jet; precipitation assessment; regional climate; seasonal variation; spatiotemporal analysis; zonal wind; Atlantic Ocean; Atlantic Ocean; Caribbean Sea; Pacific Ocean; Pacific Ocean (Tropical)
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/145475
作者单位	School of Geosciences, University of Edinburgh Grant Institute, The King’s Buildings, Edinburgh, EH9 3FE, United Kingdom; School of Geosciences, University of Edinburgh Crew Building, The King’s Buildings, Edinburgh, EH9 3FE, United Kingdom
推荐引用方式 GB/T 7714	García-Martínez I.M.,Bollasina M.A.. Sub-monthly evolution of the Caribbean Low-Level Jet and its relationship with regional precipitation and atmospheric circulation[J],2020,54.
APA	García-Martínez I.M.,&Bollasina M.A..(2020).Sub-monthly evolution of the Caribbean Low-Level Jet and its relationship with regional precipitation and atmospheric circulation.Climate Dynamics,54.
MLA	García-Martínez I.M.,et al."Sub-monthly evolution of the Caribbean Low-Level Jet and its relationship with regional precipitation and atmospheric circulation".Climate Dynamics 54(2020).