Feedback of tropical instability-wave-induced atmospheric variability onto the ocean.
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Abstract The effects of atmospheric feedbacks on tropical instability waves (TIWs) in the equatorial Atlantic Ocean are examined using a regional high-resolution coupled climate model. The analysis from a 6-yr hindcast from 1999 to 2004 reveals a negative correlation between TIW-induced wind perturbations and TIW-induced ocean currents, which implies damping of the TIWs. On the other hand, the feedback effect from the modification of Ekman pumping velocity by TIWs is small compared to the contribution to TIW growth by baroclinic instability. Overall, the atmosphere reduces the growth of TIWs by adjusting its wind response to the evolving TIWs. The analysis also shows that including ocean current (mean + TIWs) in the wind stress parameterization reduces the surface stress estimate by 15%–20% over the region of the South Equatorial Current. Moreover, TIW-induced perturbation ocean currents can significantly alter surface stress estimations from scatterometers, especially at TIW frequencies. Finally, the rectification effect from the atmospheric response to TIWs on latent heat flux is small compared to the mean latent heat flux.
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There is evidence that mesoscale ocean dynamics significantly affect the tropical Atlantic Ocean and overlying atmospheric variability across a large range of time scales from daily to interannual and interdecadal.
“Moreover, there is evidence that mesoscale ocean dynamics significantly affect the tropical Atlantic Ocean and overlying atmospheric variability across a large range of time scales from daily to interannual and interdecadal (Seo et al., 2007;Chelton and Xie, 2010).”
From The tropical atlantic observing system (2019) · cites this paper as Seo et al., 2007
The Abstract and §4 (Summary and discussion; page numbers unavailable) support an effect of tropical Atlantic instability waves on ocean currents, wind stress and atmospheric variability at short time scales. Section 4 describes longer-term effects as possible and says they require much longer simulations; it does not establish significant effects across interannual and interdecadal time scales. (LLM, conf=0.88)
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Research works printed but not linked: 7
- Brandt, P., F. A. Schott, C. Provost, A. Kartavtesff, V. Hormann, B. Bourlès, and J. Fischer, 2006: Circulations in the cen- tral equatorial Atlantic: Mean and intraseasonal to sea- sonal variability. Geophys. Res. Lett., 33, L07609, doi:10.1029/ 2005GL025498. · DOI
- Dawe, J. T., and L. Thompson, 2006: Effect of ocean surface current on wind stress, heat flux, and wind power input to the ocean. Geophys. Res. Lett., 33, L09604, doi:10.1029/ 2006GL025784. · DOI
- --, M. F. Cronin, W. S. Kessler, and D. Shea, 2007: Observed horizontal temperature advection by tropical instability waves. Geophys. Res. Lett., 34, L09604, doi:10.1029/ 2007GL029416. · DOI
- Pezzi, L. P., J. Vialard, K. J. Richard, C. Menkes, and D. Ander- son, 2004: Influence of ocean-atmosphere coupling on the properties of tropical instability waves. Geophys. Res. Lett., 31, L16306, doi:10.1029/2004GL019995. · DOI
- Schott, F. A., and Coauthors, 2003: The zonal currents and trans- ports at 35°W in the tropical Atlantic. Geophys. Res. Lett., 30, 1349, doi:10.1029/2002GL016849. · DOI
- Seo, H., M. Jochum, R. Murtugudde, and A. J. Miller, 2006: Effect of ocean mesoscale variability on the mean state of tropical Atlantic climate. Geophys. Res. Lett., 33, L09606, doi:10.1029/ 2005GL025651. · DOI
- Yu, J.-Y., and W. T. Liu, 2003: A linear relationship between ENSO intensity and tropical instability wave activity in the eastern Pacific Ocean. Geophys. Res. Lett., 30, 1735, doi:10.1029/2003GL017176. · DOI
Cited by
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The tropical atlantic observing system
Foltz, G. R., Brandt, P., Richter, I., Rodríguez-Fonseca, B., Hernandez, F., Dengler, M., Rodrigues, R. R., Schmidt, J. O., Yu, L., Lefevre, N., et al. (2019) · Frontiers in Marine Science · doi:10.3389/fmars.2019.00206 · Cited by 150 · see citing works
Generation of tropical instability waves in the Atlantic Ocean
von Schuckmann, K., Brandt, P., & Eden, C. (2008) · Journal of Geophysical Research: Oceans · doi:10.1029/2007jc004712 · Cited by 83 · see citing works
- Authors
- Seo, H., Jochum, M., Murtugudde, R., Miller, A. J., & Roads, J. O.
- Affiliations
- Scripps Institution of Oceanography (US)
- NSF National Center for Atmospheric Research (US)
- Earth System Science Interdisciplinary Center (US)
- Venue
- Journal of Climate
- Publisher
- American Meteorological Society
- Published
- 2007-12-01
- Volume
- 20
- Issue
- 23
- Pages
- 5842-5855
- ISSN
- 0894-8755 (ISSN-L)
- 1520-0442
- OpenAlex
- W2134871588
- Cited by
- 68
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 5 · 2023: 3 · 2022: 4 · 2021: 1 · 2020: 3 · 2019: 4 · 2018: 3 · 2017: 3 · 2016: 1 · 2015: 5 · 2014: 5 · 2013: 8 · 2012: 4
- FWCI
- 3.15
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Climate (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
- Funders
- U.S. Department of Energy (DE‐FG02‐, FG02-04ER63857)
- National Oceanic and Atmospheric Administration (NA17RJ1231)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Oceanographic and Atmospheric Processes
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Meteorological Phenomena and Simulations
- Keywords
- tropical instability waves, equatorial Atlantic, South Equatorial Current, Ekman pumping, baroclinic instability, wave damping, latent heat flux, coupled climate model
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