Full text
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| Author(s): |
Janini Pereira
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto Oceanográfico (IO/DIDC) |
| Defense date: | 2007-11-07 |
| Examining board members: |
Ilana Elazari Klein Coaracy Wainer;
Edmo Jose Dias Campos;
Adriene Ferreira Pereira;
Heitor Evangelista da Silva;
Ronald Buss de Souza
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| Advisor: | Ilana Elazari Klein Coaracy Wainer; Mauricio Magalhaes Mata |
| Abstract | |
In this work the interaction between Antarctic sea-ice and the South Atlantic ocean (austral and southwestern sectors) is investigated. To accomplish this satellite-observed sea-ice concentration (SIC) and a coupled model from NCAR-CCSM3 (National Center for Atmospheric Research - Community Climate System Model version 3) were employed. Three 150-year simulations, one each with the maximum (MAX), minimum (MIN) and average (control) SIC prescribed climatologies, were used to drive the CCSM3 run. The goal of the research is to evaluate the Weddell Sea and Brazil-Malvinas confluence (BMC) response to observed extremes in Antarctic sea-ice. This study focuses on annual, interannual and decadal timescales. The applied methodology uses correlation and spectrum analyses, as well as Empirical Orthogonal Functions (EOF) and Singular Value Decomposition (SVD). The annual mean behavior of oceanic variables showed sensibility to Antarctic sea-ice changes. The variability of SST and SSS anomalies showed for the sea-ice MIN experiment a spatial pattern that characterizes the cold regime of the Weddell Gyre, associate with low CDW intrusion. The response of the temperature variability, between sea-ice MAX and MIN scenarios, for the BMC region suggests that less Antarctic sea-ice produces a SST anomaly intensification in this region with a interannual cycle of the 2-3year and decadal cycle of the 25-year. The oceanic circulation in both study regions, related to positive SAM events, showed a intensification to less SIC influence. (AU) | |
| FAPESP's process: | 03/03054-2 - Interaction between the Antarctic sea ice and the South Atlantic Ocean using a coupled model of general circulation |
| Grantee: | Janini Pereira |
| Support Opportunities: | Scholarships in Brazil - Doctorate |