Heavy Rainfall Episodes in the Eastern Northeast Brazil Linked to Large-Scale Ocean-Atmosphere Conditions in the Tropical Atlantic
Joint Authors
Kouadio, Yves K.
Servain, Jacques
Lentini, Carlos A. D.
Machado, Luiz A. T.
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-07-09
Country of Publication
Egypt
No. of Pages
16
Main Subjects
Abstract EN
Relationships between simultaneous occurrences of distinctive atmospheric easterly wave (EW) signatures that cross the south-equatorial Atlantic, intense mesoscale convective systems (lifespan > 2 hour) that propagate westward over the western south-equatorial Atlantic, and subsequent strong rainfall episodes (anomaly > 10 mm·day−1) that occur in eastern Northeast Brazil (ENEB) are investigated.
Using a simple diagnostic analysis, twelve cases with EW lifespan ranging between 3 and 8 days and a mean velocity of 8 m·s−1 were selected and documented during each rainy season of 2004, 2005, and 2006.
These cases, which represent 50% of the total number of strong rainfall episodes and 60% of the rainfall amount over the ENEB, were concomitant with an acceleration of the trade winds over the south-equatorial Atlantic, an excess of moisture transported westward from Africa to America, and a strengthening of the convective activity in the oceanic region close to Brazil.
Most of these episodes occurred during positive sea surface temperature anomaly patterns over the entire south-equatorial Atlantic and low-frequency warm conditions within the oceanic mixing layer.
A real-time monitoring and the simulation of this ocean-atmosphere relationship could help in forecasting such dramatic rainfall events.
American Psychological Association (APA)
Kouadio, Yves K.& Servain, Jacques& Machado, Luiz A. T.& Lentini, Carlos A. D.. 2012. Heavy Rainfall Episodes in the Eastern Northeast Brazil Linked to Large-Scale Ocean-Atmosphere Conditions in the Tropical Atlantic. Advances in Meteorology،Vol. 2012, no. 2012, pp.1-16.
https://search.emarefa.net/detail/BIM-466577
Modern Language Association (MLA)
Kouadio, Yves K.…[et al.]. Heavy Rainfall Episodes in the Eastern Northeast Brazil Linked to Large-Scale Ocean-Atmosphere Conditions in the Tropical Atlantic. Advances in Meteorology No. 2012 (2012), pp.1-16.
https://search.emarefa.net/detail/BIM-466577
American Medical Association (AMA)
Kouadio, Yves K.& Servain, Jacques& Machado, Luiz A. T.& Lentini, Carlos A. D.. Heavy Rainfall Episodes in the Eastern Northeast Brazil Linked to Large-Scale Ocean-Atmosphere Conditions in the Tropical Atlantic. Advances in Meteorology. 2012. Vol. 2012, no. 2012, pp.1-16.
https://search.emarefa.net/detail/BIM-466577
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-466577