HR: 14:00h
AN: OS23C-04    [Abstracts]
TI: Intraseasonal Variability Of Tropical And South Atlantic - Observation And Modeling
AU: * De Camargo, R
EM: ricamarg@model.iag.usp.br
AF: Department Of Atmospheric Sciences, Rua Do Matao 1226, Sao Paulo, SP 05508-090, Brazil
AB: Intraseasonal variability on the Tropical and South Atlantic has been analyzed through the use of SST and surface wind data respectively from TMI and QuikScat satellite missions and also through numerical modeling on basin scale with Princeton Ocean Model. The intrinsic intraseasonal ocean variability and the correspondent co- variability with atmosphere were evaluated in terms of SST and surface wind anomaly fields and their cross wavelet transforms, both for observations and modeled results. Observations related to the tropical area revealed that: (i) the presence of intrinsic ocean intraseasonal variability (30-40 days) mainly from July to October associated to TIW activity with strong influence over surface winds, i.e., dominance of ocean over atmosphere in longer intraseasonal periods and (ii) atmospheric driven intraseasonal ocean variability from February to May with smaller intraseasonal periods. Besides, the extra-tropical areas with permanent strong temperature gradients (Brazil-Malvinas Confluence as well as Agulhas Current) presented a similar behavior, but not necessarily during the same months. In a general way, the numerical experiments with POM with 0.5 degree resolution could capture the intrinsic ocean behavior in both tropical and extra-tropical regions, which means that the physical mechanism has been well represented by the model.
DE: 4227 Diurnal, seasonal, and annual cycles (0438)
DE: 4255 Numerical modeling (0545, 0560)
DE: 4504 Air/sea interactions (0312, 3339)
SC: Ocean Sciences [OS]
MN: 2007 Joint Assembly