NDLI: Some evidence on the relationship between the South American monsoon and the Atlantic ITCZ

Content Provider	Springer Nature Link
Author	Garcia, Sâmia R. Kaya, Mary T.
Copyright Year	2009
Abstract	The seasonal variations of convection associated with the South American monsoon system (SAMS) are analyzed using pentad means of outgoing longwave radiation (OLR) data during the 1979–2006 period. The data is filtered for the 0.4–1.2 year scale and an empirical orthogonal function (EOF) analysis is applied. The results provide three dominant modes with distinct convective features, which are referred to as: equatorially antisymmetric, intertropical convergence zone (ITCZ) and symmetric modes. The first two modes vary in an annual scale, and the latter one in a semiannual scale. The evolving aspects of these modes are studied by correlating (lagged and simultaneously) the principal component of each mode and the filtered OLR time series. The antisymmetric and the ITCZ modes evolve smoothly into each other reflecting the northwestward and northeastward propagation of convective activity. The propagation rates vary depending on development stage and region considered. On the other hand, the symmetric mode with the largest convective activity in the western Amazon evolves independently, and depicts the transition from dry to wet seasons and vice-versa.
Starting Page	29
Ending Page	38
Page Count	10
File Format	PDF
ISSN	0177798X
Journal	Theoretical and Applied Climatology
Volume Number	99
Issue Number	1-2
e-ISSN	14344483
Language	English
Publisher	Springer Vienna
Publisher Date	2009-02-12
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Climate Change Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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