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http://hdl.handle.net/11422/12773| Type: | Dissertação |
| Title: | Transporte de volume e calor pelos vórtices da corrente norte do Brasil |
| Author(s)/Inventor(s): | Bueno, Luana Ferraz |
| Advisor: | Paiva, Afonso de Moraes |
| Abstract: | Um método que combina uma base de dados global com 24 anos de duração (janeiro de 1993 a dezembro de 2016) de trajetórias de vórtices (CHELTON et al., 2011), obtidas a partir de altimetria, com a base EN4.2.0 de perfis verticais de temperatura (T) e salinidade (S), provenientes de XBTs/MBTs, CTDs e perfiladores Argo (GOOD et al., 2013), foi utilizado para reconstruir a estrutura vertical média dos vórtices da Corrente Norte do Brasil (CNB) e calcular algumas de suas propriedades. A formação anual média de vórtices foi estimada em 6,4 ± 1,8, apresentando grande variabilidade inter-anual, com o desprendimento de 2 a 10 vórtices por ano. Um total 1466 (698) perfis de T (S) foram utilizados na reconstrução do vórtice médio, cujo transporte meridional de volume foi calculado em 1,3 Sv (1Sv = 106 m3 s −1 ), levando a um transporte anual total de 8,3 ± 2,3 Sv. Segundo esta estimativa, os vórtices da CNB seriam responsáveis por 64% do transporte líquido do ramo quente da Célula de Revolvimento Meridional do Atlântico (AMOC), chegando a 80% nos anos de máxima formação. O vórtice médio apresentou máxima anomalia de T (S) de 5,7◦C (0,6) em torno de 150 (180) m de profundidade. O transporte anual de calor pelos vórtices da CNB foi estimado em 0,4 ± 0,13 PW, representando aproximadamente 40% do transporte meridional total de calor na latitude de 11◦N. |
| Abstract: | A methodology that combines a 24-year long (January 1993 to December 2016) global dataset of eddy trajectories (CHELTON et al., 2011), derived from altimetry, with vertical temperature (T) and salinity (S) profiles from EN4.2.0 dataset (GOOD et al., 2013), derived from XBTs/MBTs, CTDs and Argo floats, was used to reconstruct the mean vertical structure of North Brazil Current (NBC) rings, and to calculate some of their properties. The annual-mean formation of NBC rings was estimated in 6.4 ± 1.8. High inter-annual variability was observed, with 2 to 10 rings being shed at different years. A total of 1466 (698) T (S) profiles were used in order to reconstruct the mean-ring vertical structure. The meridional volume transport of the mean-ring was estimated in 1.3 Sv (1Sv = 106 m3 s −1 ), leading to a annualized transport of 8.3 ± 2.3 Sv. According to these estimates, the NBC rings are responsible for 64% of the northward transport by the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), reaching 80% in years of maximum ring formation. The mean NBC ring showed a maximum T (S) anomaly of 5.7◦C (0.6), at depths of ∼150 (180) m. The contribution of NBC rings was estimated in approximately 40% of the total meridional heat transport across 11◦N. |
| Keywords: | AMOC Atlântico Equatorial |
| Subject CNPq: | CNPQ::ENGENHARIAS |
| Program: | Programa de Pós-Graduação em Engenharia Oceânica |
| Production unit: | Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia |
| Publisher: | Universidade Federal do Rio de Janeiro |
| Issue Date: | Apr-2018 |
| Publisher country: | Brasil |
| Language: | por |
| Right access: | Acesso Aberto |
| Appears in Collections: | Engenharia Oceânica |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| LuanaFerrazBueno-min (1).pdf | 1.28 MB | Adobe PDF | View/Open |
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