Abstract

The termination of Indian Ocean Dipole (IOD) events is examined in terms of equatorial wave dynamics. In situ and satellite observations combined with an output from a linear wave model are used in this study. Our emphasis is on the 1997 IOD event but our results apply to other positive IOD events as well. We find that the termination of anomalously cold sea surface temperature (SST) in the eastern pole of the dipole is associated with a warming tendency caused by the net surface heat fluxes. However, net surface heat fluxes alone cannot explain the total change in the SST. We show that during the peak phase of an IOD event, the weakening of zonal heat advection caused by eastern boundary-generated Rossby waves combined with the reduction of vertical entrainment and diffusion creates favorable conditions for surface heat fluxes to warm the SST in the eastern basin.

Details

Title
Role of the eastern boundary-generated waves on the termination of 1997 Indian Ocean Dipole event
Author
Iskhaq, Iskandar 1   VIAFID ORCID Logo  ; Nagura Motoki 2 ; McPhaden, Michael J 3 

1  University of Sriwijaya, Department of Physics, Faculty of Mathematics and Natural Sciences, Indralaya, Indonesia (GRID:grid.108126.c) (ISNI:0000 0001 0557 0975) 
2  Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan (GRID:grid.410588.0) (ISNI:0000 0001 2191 0132) 
3  NOAA, Pacific Marine Environmental Laboratory, Seattle, USA (GRID:grid.422706.5) (ISNI:0000 0001 2168 7479) 
Publication year
2021
Publication date
Dec 2021
Publisher
Springer Nature B.V.
e-ISSN
21964092
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1186/s40562-021-00205-8
ProQuest document ID
2602864591
Copyright
© The Author(s) 2021. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.