雨季期间亚马逊东部降雨的时空变化

Spatial and temporal variability of rainfall in eastern Amazon during the rainy season.

作者信息

Ferreira Douglas Batista da Silva, de Souza Everaldo Barreiros, de Moraes Bergson Cavalcanti, Meira Filho Luiz Gylvan

机构信息

Vale Institute of Technology, Boaventura da Silva Street 955, 66055-090 Belém, PA, Brazil ; Post-Graduate Program in Environmental Sciences, Federal University of Pará, Augusto Corrêa Street 1, 66075-110 Belém, PA, Brazil.

Vale Institute of Technology, Boaventura da Silva Street 955, 66055-090 Belém, PA, Brazil.

出版信息

ScientificWorldJournal. 2015;2015:209783. doi: 10.1155/2015/209783. Epub 2015 Feb 22.

DOI:10.1155/2015/209783

PMID:25793218

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4352512/

Abstract

Empirical orthogonal functions (EOF) and composites analysis were employed on pentad data in order to investigate the tropical atmospheric-ocean patterns over the Atlantic Ocean and the spatial-temporal characteristics of the rainfall in eastern Amazon during the peak of the rainy season (February to April). The EOF results evidenced that the Intertropical Convergence Zone (ITCZ) is the main rainfall-producing system in eastern Amazon during the rainy season. Conditions associated with the southward SST gradient in the intertropical Atlantic formed the dynamic patterns that favored the position of the ITCZ to south of the equator, thus explaining the predominance of positive precipitation anomalies in eastern Amazon, especially in the state of Maranhão and northeastern Pará during the February and April months.

摘要

为了研究大西洋上的热带大气海洋模式以及雨季高峰期（2月至4月）亚马逊东部降雨的时空特征，对五日数据采用了经验正交函数（EOF）和合成分析。EOF结果表明，热带辐合带（ITCZ）是雨季期间亚马逊东部主要的降雨产生系统。与热带大西洋海温向南梯度相关的条件形成了有利于ITCZ位于赤道以南的动态模式，从而解释了亚马逊东部，特别是2月和4月期间马拉尼昂州和帕拉州东北部正降水异常的主导地位。