Cited by 50Climate variability and modelsAtmospheric aerosols and cloudsMeteorological Phenomena and Simulations

The influence of cloud feedbacks on equatorial Atlantic variability.

Open access
Bellomo, Katinka, Clement, Amy C., Mauritsen, Thorsten, Rädel, Gaby, Stevens, Bjorn·2015·Journal of Climate

Abstract

Observations show that cloud feedback over the Namibian stratocumulus region is positive because cloud cover is anticorrelated with local sea surface temperature (SST) anomalies. Moreover, regressions of observed atmospheric fields on equatorial Atlantic SST anomalies indicate that cloud feedbacks over the Namibian stratocumulus region covary with Atlantic Niño. However, from observations alone, it is not possible to quantify the influence of regional cloud feedbacks on equatorial climate variability. To address this question, a set of sensitivity experiments are conducted using an atmospheric general circulation model (ECHAM6) coupled to a slab ocean in which the strength of positive cloud feedback is enhanced over several regions in the South Atlantic basin. Enhanced positive cloud feedback over the Namibian stratocumulus region increases local as well as equatorial SST variability, whereas enhanced cloud feedback over other regions in the South Atlantic increases local SST variability but exhibits negligible responses at the equator. The authors’ results indicate that the Namibian region plays a central role in enhancing equatorial SST variability because it is located where the SST anomalies associated with the simulated Atlantic Niño in the slab-ocean model develop. These results highlight the important role of the regional coupling of cloud cover over the Namibian region with local SSTs and its effects on equatorial Atlantic climate variability.

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Crossref · 10.1175/jcli-d-14-00495.1

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  • Positive dust and cloud feedbacks on SST and climate have been established at interannual and decadal timescales in both hemispheres and are capable of amplifying the AMV.

    “Positive dust and cloud feedbacks on SST and climate have been established at interannual and decadal timescales in both hemispheres (Evan et al., 2011;Bellomo et al., 2015;Myers et al., 2018) and are capable of amplifying the AMV (Bellomo et al., 2016;Yuan et al., 2016).”

    From The tropical atlantic observing system (2019) · cites this paper as Bellomo et al., 2015

    The Summary (page unavailable) reports that positive low-level cloud feedback over the Namibian region enhances simulated Atlantic Niño variability, supporting the cloud-feedback part of the first clause. It does not establish positive dust feedbacks or cloud feedbacks at both interannual and decadal timescales in both hemispheres; the Introduction says the relationship between North and South Atlantic variability remains unclear. The sentence cites other papers, not Bellomo et al. (2015), for the separate AMV-amplification clause. (LLM, conf=0.88)

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9 of the 69 references couldn’t be matched to a known paper.

Research works printed but not linked: 5

  1. Penland, C., and L. Matrosova, 1998: Prediction of tropical Atlantic sea surface temperatures using linear inverse modeling. J. Cli- mate, 11, 483-496, doi:10.1175/1520-0442(1998)011,0483: POTASS.2.0.CO;2. · DOI
  2. Robertson, A. W., J. D. Farrara, and C. R. Mechoso, 2003: Simu- lations of the atmospheric response to South Atlantic sea surface temperature anomalies. J. Climate, 16, 2540-2551, doi:10.1175/1520-0442(2003)016,2540:SOTART.2.0.CO;2. · DOI
  3. Ruiz-Barradas, A., J. A. Carton, and S. Nigam, 2000: Structure of interannual-to-decadal climate variability in the tropical Atlantic sector. J. Climate, 13, 3285-3297, doi:10.1175/ 1520-0442(2000)013,3285:SOITDC.2.0.CO;2. · DOI
  4. Sutton, R. T., S. P. Jewson, and D. P. Rowell, 2000: The elements of climate variability in the tropical Atlantic. J. Climate, 13, 3261- 3284, doi:10.1175/1520-0442(2000)013,3261:TEOCVI.2.0.CO;2. · DOI
  5. Zebiak, S. E., 1993: Air-sea interaction in the equatorial Atlantic region. J. Climate, 6, 1567-1586, doi:10.1175/ 1520-0442(1993)006,1567:AIITEA.2.0.CO;2. · DOI · Paper page

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Authors
Bellomo, K., Clement, A. C., Mauritsen, T., Rädel, G., & Stevens, B.
Affiliations
  • University of Miami (US)
  • Max Planck Society (DE)
  • Max Planck Institute for Meteorology, Hamburg, Germany
Venue
Journal of Climate
Published
2015-03-27
Volume
28
Issue
7
Pages
2725-2744
ISSN
  • 0894-8755 (ISSN-L)
  • 1520-0442
OpenAlex
W2033185109
Cited by
50
References
69
Citations by year
2026: 1 · 2025: 2 · 2023: 4 · 2022: 3 · 2021: 3 · 2020: 14 · 2019: 5 · 2018: 1 · 2017: 9 · 2016: 5 · 2015: 3
FWCI
4.92
Type
journal article
Language
en
Open access
Locations
  • Journal of Climate (publishedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion, other-oa)
  • Padua Research Archive (University of Padova) (submittedVersion)
Funders
  • National Science Foundation (0946225)
  • U.S. Department of Energy (DESC0004897)
  • Bundesministerium für Bildung und Forschung
  • National Oceanic and Atmospheric Administration
  • Office of Science
  • Climate Program Office
Topics
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
  • Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
Keywords
cloud feedback, sea surface temperature anomalies, Atlantic Niño, cloud cover, sea surface temperature variability, sensitivity experiments, ECHAM6, slab model

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