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contributor authorNagura, Motoki
contributor authorMasumoto, Yukio
contributor authorHorii, Takanori
date accessioned2017-06-09T17:20:06Z
date available2017-06-09T17:20:06Z
date copyright2014/01/01
date issued2013
identifier issn0022-3670
identifier otherams-83368.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226585
description abstracthis study examines heat advection due to mixed Rossby gravity waves in the equatorial Indian Ocean using moored buoy observations at (0°, 80.5°E) and (0°, 90°E) and an ocean general circulation model (OGCM) output. Variability associated with mixed Rossby gravity waves is defined as that at periods of 10?30 days, where both observations and the OGCM results show high energy in meridional velocity and meridional gradient of temperature. The 10?30-day variability in meridional velocity causes convergence of heat flux onto the equator, the net effect of which amounts to 2.5°C month?1 warming at the depth of the thermocline. Detailed analysis shows that the wave structure manifested in temperature and velocity is tilted in the x?z plane, which causes the phase lag between meridional velocity and meridional temperature gradient to be a half cycle on the equator and results in sizable thermocline warming. An experiment with a linear continuously stratified model shows that the contributions of many baroclinic modes, and the right zonal wavelength of wind forcing, are essential in generating the correct wave structure. It is also shown that contributions of mixed Rossby gravity waves to cross-equatorial heat transport are negligible, as temperature variability associated with this wave mode has a node on the equator.
publisherAmerican Meteorological Society
titleMeridional Heat Advection due to Mixed Rossby Gravity Waves in the Equatorial Indian Ocean
typeJournal Paper
journal volume44
journal issue1
journal titleJournal of Physical Oceanography
identifier doi10.1175/JPO-D-13-0141.1
journal fristpage343
journal lastpage358
treeJournal of Physical Oceanography:;2013:;Volume( 044 ):;issue: 001
contenttypeFulltext


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