Feedback of tropical instability wave induced atmospheric variability onto the ocean

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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Copyright 2007 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.
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Author Seo, Hyodae
Jochum, Markus
Murtugudde, Maghu
Miller, Arthur
Roads, John
Publisher UCAR/NCAR - Library
Publication Date 2007-12-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:26:57.511851
Metadata Record Identifier edu.ucar.opensky::articles:6951
Metadata Language eng; USA
Suggested Citation Seo, Hyodae, Jochum, Markus, Murtugudde, Maghu, Miller, Arthur, Roads, John. (2007). Feedback of tropical instability wave induced atmospheric variability onto the ocean. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d78g8kz2. Accessed 15 March 2025.

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