Impact of ENSO on seasonal variations of Kelvin Waves and mixed Rossby-Gravity Waves.

Rakhman, Saeful, Lubis, Sandro Wellyanto and Setiawan, Sonni (2017) Impact of ENSO on seasonal variations of Kelvin Waves and mixed Rossby-Gravity Waves. Open Access IOP Conference Series: Earth and Environmental Science, 54 . 012035. DOI 10.1088/1755-1315/54/1/012035.

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Abstract

Characteristics of atmospheric equatorial Kelvin waves and mixed Rossby-Gravity (MRG) waves as well as their relationship with tropical convective activity associated with El Niño-Southern Oscillation (ENSO) were analyzed. Kelvin waves and MRG waves were identified by using a Space-Time Spectral Analysis (STSA) technique, where the differences in the strength of both waves were quantified by taking the wave spectrum differences for each ENSO phase. Our result showed that Kelvin wave activity is stronger during an El Nino years, whereas the MRG wave activity is stronger during the La Nina years. Seasonal variations of Kelvin wave activity occurs predominantly in MAM over the central to the east Pacific in the El Nino years, while the strongest seasonal variation of MRG wave activity occus in MAM and SON over the northern and southern Pacific during La Nina years. The local variation of Kelvin wave and MRG wave activities are found to be controlled by variation in lower level atmospheric convection induced by sea surface temperature in the tropical Pacific Ocean.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: No
Open Access Journal?: Yes
DOI etc.: 10.1088/1755-1315/54/1/012035
ISSN: 1755-1307
Date Deposited: 16 Feb 2017 11:48
Last Modified: 16 Feb 2017 11:48
URI: http://oceanrep.geomar.de/id/eprint/36603

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