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Role of non-linear oceanic processes in the response to Westerly Wind Events: new implications for the 1997 El Niño onset

Role of non-linear oceanic processes in the response to Westerly Wind Events: new implications for the 1997 El Niño onset
Role of non-linear oceanic processes in the response to Westerly Wind Events: new implications for the 1997 El Niño onset
In March 1997, a strong westerly wind event (WWE) occurred in the western equatorial Pacific prior to the 1997-1998 El Niño event. It produced downwelling Kelvin waves that interacted non linearly with the surface temperature, salinity and zonal current fronts located at the eastern edge of the warm-fresh pool (EEWP). This non-linear interaction locally increased zonal currents by a factor of three compared to a theoretical linear response, and advected the EEWP at an unexpected rate (? 1m/s) to which the ocean-atmosphere coupled system may have been responding rapidly to trigger El Nino conditions.
0094-8276
1603-1606
Boulanger, J-P.
da140c38-f083-45a1-942b-a9489c12942e
Durand, E.
0d03f819-7185-421a-a62e-34613891766a
Duvel, J-P.
302d03b2-34ca-4574-9d73-76674bdc9ded
Menkes, C.
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Delecluse, P.
028a6421-1545-4e7d-b0d9-b34987c31486
Imbard, M.
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Lengaigne, M.
64572929-e2cd-4234-83a5-0a6281c3ff97
Madec, G.
7e2ec04b-896a-4861-b2d0-b74f39d748c2
Masson, S.
facf31ca-bea1-4286-9fd2-61ff721f2165
Boulanger, J-P.
da140c38-f083-45a1-942b-a9489c12942e
Durand, E.
0d03f819-7185-421a-a62e-34613891766a
Duvel, J-P.
302d03b2-34ca-4574-9d73-76674bdc9ded
Menkes, C.
7a30ebbe-4117-4039-a912-c94e6a40cb3e
Delecluse, P.
028a6421-1545-4e7d-b0d9-b34987c31486
Imbard, M.
5e82b2b4-c370-4335-bfe7-ab321573cdd4
Lengaigne, M.
64572929-e2cd-4234-83a5-0a6281c3ff97
Madec, G.
7e2ec04b-896a-4861-b2d0-b74f39d748c2
Masson, S.
facf31ca-bea1-4286-9fd2-61ff721f2165

Boulanger, J-P., Durand, E., Duvel, J-P., Menkes, C., Delecluse, P., Imbard, M., Lengaigne, M., Madec, G. and Masson, S. (2001) Role of non-linear oceanic processes in the response to Westerly Wind Events: new implications for the 1997 El Niño onset. Geophysical Research Letters, 28 (8), 1603-1606.

Record type: Article

Abstract

In March 1997, a strong westerly wind event (WWE) occurred in the western equatorial Pacific prior to the 1997-1998 El Niño event. It produced downwelling Kelvin waves that interacted non linearly with the surface temperature, salinity and zonal current fronts located at the eastern edge of the warm-fresh pool (EEWP). This non-linear interaction locally increased zonal currents by a factor of three compared to a theoretical linear response, and advected the EEWP at an unexpected rate (? 1m/s) to which the ocean-atmosphere coupled system may have been responding rapidly to trigger El Nino conditions.

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Published date: 2001
Organisations: National Oceanography Centre,Southampton

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Local EPrints ID: 64820
URI: https://eprints.soton.ac.uk/id/eprint/64820
ISSN: 0094-8276
PURE UUID: 7f191e6f-b111-4a13-8bfe-7b78f37b1f61

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Date deposited: 15 Jan 2009
Last modified: 13 Mar 2019 20:20

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Contributors

Author: J-P. Boulanger
Author: E. Durand
Author: J-P. Duvel
Author: C. Menkes
Author: P. Delecluse
Author: M. Imbard
Author: M. Lengaigne
Author: G. Madec
Author: S. Masson

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