The South Atlantic sub-tropical dipole mode since the last deglaciation and changes in rainfall

Wainer, Ilana; Prado, Luciana Figueiredo; Khodri, Myriam; Otto‐Bliesner, Bette L.

doi:10.1007/s00382-020-05468-z

Cited by 15 publications

(30 citation statements)

References 49 publications

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“…The SST distribution in the South Atlantic is well documented to influence the precipitation distribution over (sub)tropical South America (Bombardi et al., 2014; Wainer et al., 2014, 2021). The SST pattern is manifested as the South Atlantic Dipole that is in a positive mode when the tropical South Atlantic surface warms anomalously relative to the extratropical South Atlantic (and vice versa for a negative South Atlantic Dipole; see Figure ) (Venegas et al., 1997).…”

Section: Discussionmentioning

confidence: 99%

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

Bahr

Kaboth‐Bahr

Jaeschke

et al. 2021

Paleoceanog and Paleoclimatol

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 Marine record documents decadal-to millennial-scale fluctuations of monsoonal rainfall in eastern South America during the past 5000 years  Precipitation variability was caused by antiphased shifts of the South Atlantic Convergence Zone and South American Low-Level Jet  Changes in oceanic overturning strength mediate transfer of high-northern-latitude climate disturbances into Southern Hemisphere tropics Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Section: Discussionmentioning

confidence: 99%

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

Bahr

Kaboth‐Bahr

Jaeschke

et al. 2021

Paleoceanog and Paleoclimatol

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“…A specific example is the Tropical Atlantic sea surface temperature dipole, a cross-equatorial sea surface temperature pattern that appears dominant on decadal timescales and is one of the key features in the Tropical Atlantic Ocean. Its variability has a direct impact on climate (through the displacement of the Intertropical Convergence Zone northwards or southwards) and on continental regions, such as northeastern Brazil and the neighboring Western Africa (Sahel) region, as well as on the formation of cyclones in the North Atlantic (Wainer et al, 2020).…”

Section: Context -The South Atlantic Region Environmental Settingsmentioning

confidence: 99%

Pollutants in the South Atlantic Ocean: Sources, Knowledge Gaps and Perspectives for the Decade of Ocean Science

et al. 2021

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The current manuscript presents the main issues related to the “Clean Ocean” outcome that arose from the Regional South Atlantic (SA) Planning Workshop for the UN Decade of Ocean Science and five Brazilian Regional Planning Workshops. An interdisciplinary and trans-sectoral group constituted by the academia, non-governmental agencies, the private sector, decision-makers, the navy, and local communities discussed the main anthropogenic drivers compromising the current environmental status of the SA and its ecological services, and debated the main research gaps, priorities and needs for improving technical and structural capacities in order to roadmap the Brazilian actions for the Decade of Ocean Science. The aim of this review is to contribute to a social solution-driven understanding of the ocean ecosystems, to create conditions to promote sustainable development and to secure a clean, healthy ocean. We are proposing a list of actions to be implemented by the Decade of Ocean Science that will have the pivotal role to promote technical and scientific capacity development, increase research infrastructure and institutional frameworks, develop national public policies aimed at reducing the input of pollutants and management of impacts, and warranting food security and ecosystem health. The earlier the actions in controlling pollutants are implemented, along with the identification of key sources and prevention of crossing of thresholds will help to avert worst-case scenarios, reducing the socio-economic disparities of impacts across nations and social groups and supporting the sustainable development of a pollutant-free ocean.

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“…Moreover, the interannual variability of the two modes has been linked to the El Niño-Southern Oscillation (ENSO) (Boschat et al, 2013). The two subtropical modes exert a great influence on precipitation in Africa and South America (Reason, 2001(Reason, , 2002Vigaud et al, 2009;Nnamchi and Li, 2011;Morioka et al, 2012;Wainer et al, 2020) and, therefore, understanding the relationship between the two modes has practical implications for precipitation forecasts in Africa and South America on a seasonal scale and beyond.…”

Section: Introductionmentioning

confidence: 99%

A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades

Zhong

Vihma

et al. 2023

Atmos. Chem. Phys.

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Abstract. We utilized the global atmospheric reanalysis ERA5 and reconstructed sea surface temperature (SST) data from 1979 through 2020 to examine the stability of the relationship between the SST oscillations in the southern Indian Ocean and the Atlantic Ocean, as described by the Subtropical Indian Ocean Dipole (SIOD) and South Atlantic Ocean Dipole (SAOD) indices, respectively. We note a significant positive correlation between the two indices prior to the year 2000 but practically no correlation afterwards. We show that in the two decades prior to 2000, a positive phase of the SAOD is associated with more convective activities over the subtropical southern Atlantic Ocean and eastern Brazil, which trigger a stronger upper-atmosphere wavetrain. This produces stronger southern subtropical highs and surface anti-cyclonic circulations and therefore a stronger correlation between the two indices. The situation is reversed after 2000. Our results are potentially applicable to predictions of precipitation in southern Africa and South America.

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The South Atlantic sub-tropical dipole mode since the last deglaciation and changes in rainfall

Cited by 15 publications

References 49 publications

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

Late Holocene Precipitation Fluctuations in South America Triggered by Variability of the North Atlantic Overturning Circulation

Pollutants in the South Atlantic Ocean: Sources, Knowledge Gaps and Perspectives for the Decade of Ocean Science

A change in the relation between the Subtropical Indian Ocean Dipole and the South Atlantic Ocean Dipole indices in the past four decades

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