HR: 1330h
AN: OS23A-08    [Abstracts]
TI: Hydro-Meteorological Conditions over the Southeastern South America during ENSO years and its Impact on the Adjacent Continental Shelf
AU: * Lentini, C A
EM: lentini@io.usp.br
AF: Instituto Oceanografico da Universidade de Sao Paulo, Praca do Oceanografico, 191, Sao Paulo, SP 05508-120 Brazil
AU: Arruda, W Z
EM: wilton@im.ufrj.br
AF: Instituto de Matematica da Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowsky s/n, Centro de Tecnologia, Bloco C, Rio de Janeiro, RJ 68530 Brazil
AU: De Almeida, R A
EM: roberto@dealmeida.net
AF: Instituto Oceanografico da Universidade de Sao Paulo, Praca do Oceanografico, 191, Sao Paulo, SP 05508-120 Brazil
AU: Campos, E J
EM: edmo@io.usp.br
AF: Instituto Oceanografico da Universidade de Sao Paulo, Praca do Oceanografico, 191, Sao Paulo, SP 05508-120 Brazil
AB: An investigation of the hydro-meteorological conditions during ENSO years and its impact over the adjacent continental shelf has been carried out using monthly mean time series of the la Plata river discharge, the latitude of separation of the Brazil and Malvinas current, and NCEP winds. From the ENSO composites two major results can be highlighted. First, a considerable difference in the amplitude response from one event to another for the same ENSO phase is clearly observed. Second, there is a tendency for larger amplitude anomalies during El Niño (EN) years than during La Niña (LN) years. Although the river's response to ENSO events shows the same tendency for positive (negative) anomalies along the EN (LN) composites, the largest peak of the la Plata river associated with EN occurs in January(+1) instead of December(0). The Brazil and Malvinas latitude of separation composites show positive (negative) monthly anomalies during EN (LN) events from July(0) at least until January(+1). Analysis of the NCEP alongshelf anomaly wind suggests a relationship between river runoff and the latitude of separation of the Brazil Current.
DE: 1833 Hydroclimatology
DE: 1860 Runoff and streamflow
DE: 4275 Remote sensing and electromagnetic processes (0689)
DE: 4522 El Ni¤o
DE: 4546 Nearshore processes
SC: Ocean Sciences [OS]
MN: 2005 Joint Assembly