Interactions between sea surface temperature over the South Atlantic Ocean and the South Atlantic convergence zone.
Open accessAbstract
Interactions between the sea surface temperature (SST) over the South Atlantic Ocean (40°S‐Equador) and the South Atlantic Convergence Zone (SACZ) were studied through numerical experiments with an atmospheric general circulation model (AGCM) and an ocean general circulation model (OGCM). The AGCM experiments showed that warm SST anomalies over the South Atlantic tend to intensify the SACZ and shift it northward, while cool SST anomalies over the South Atlantic tend to weaken the SACZ. The OGCM experiments, on the other hand, showed that the intensification of the SACZ contributes to cool the underlying ocean through the reduction of incident shortwave solar radiation, causing the appearance of cold SST anomalies or the weakening of pre‐existing warm SST anomalies. The most important finding in this work was the predominance of the cloud/shortwave ‐ SST negative thermodynamic feedback between the atmosphere and the ocean over the southwest tropical Atlantic, this is one order of magnitude larger than the dynamic feedback associated with Ekman pumping. The latter was verified only during strong SACZ events. The results suggest that negative SST anomalies often observed underlying the SACZ represent an ocean response to atmospheric forcing.
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Direct measurements of the surface heat flux have proven valuable for diagnosing air-sea coupling in the southwestern tropical Atlantic near the Brazilian coast.
“Direct measurements of the surface heat flux have also proven valuable for diagnosing air-sea coupling in the southwestern tropical Atlantic near the Brazilian coast (Chaves and Nobre, 2004;De Almeida et al., 2007).”
From The tropical atlantic observing system (2019) · cites this paper as Chaves and Nobre, 2004
The Methodology (§2, ¶9) says the study used model-generated and parameterized surface heat fluxes; the AGCM Experiments (§3.1, ¶11) use those heat budgets to examine ocean–atmosphere interaction in the western South Atlantic. This supports the value of heat-flux analysis, but not the claim that direct measurements proved valuable near the Brazilian coast. (LLM, conf=0.88)
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References 13 · Cited by 169
Research works printed but not linked: 1
- Hastenrath, S., Ed. (1995), Climate and Circulation of the Tropics, in Cli- mate and Circulation of the Tropics, pp. 455, D. Reidel Publishing Company, Madison.
- Authors
- Chaves, R. R., & Nobre, P.
- Affiliations
- Instituto Nacional de Pesquisas Espaciais (BR)
- ORCID
- Nobre, Paulo
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2004-02
- Volume
- 31
- Issue
- 3
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W2043822581
- Cited by
- 169
- References
- 13
- Citations by year
- 2026: 3 · 2025: 2 · 2024: 13 · 2023: 8 · 2022: 19 · 2021: 11 · 2020: 7 · 2019: 23 · 2018: 7 · 2017: 9 · 2016: 6 · 2015: 7 · 2014: 5 · 2013: 8 · 2012: 2
- FWCI
- 3.76
- Type
- journal article
- Language
- en
- Open access
- green
- urlib.net
- Locations
- Geophysical Research Letters (publishedVersion)
- Biblioteca Digital da Memória Científica do INPE (National Institute for Space Research) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Keywords
- South Atlantic Convergence Zone, sea surface temperature anomalies, ocean-atmosphere interaction, shortwave radiation, Ekman pumping
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