North-south asymmetry of warm water volume transport related with El Niño variability

Details North-south asymmetry of warm water volume transport related with El Niño variability North-south asymmetry of warm water volume transport related with El Niño variability

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3518612i&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 18, CiteID L18612

Physics

3

Oceanography: General: Equatorial Oceanography, Oceanography: General: Climate And Interannual Variability (1616, 1635, 3305, 3309, 4513), Oceanography: Physical: Enso (4922), Oceanography: General: Numerical Modeling (0545, 0560), Oceanography: Physical: Western Boundary Currents

Scientific paper

A better understanding of variability in the volume of warm water in the equatorial Pacific pycnocline (warm water volume, or WWV) is critical to understanding El Niño-Southern Oscillation (ENSO) variability. We have investigated the meridional WWV transport in the Northern (NH) and Southern Hemispheres (SH) using a high-resolution general circulation model. The transport in the western boundary region compensates the interior transport in the SH, where Sverdrup balance holds approximately. In contrast, such compensation does not hold in the NH, because the boundary transport lags interior transport by about 7 months. Hence, the WWV exchange in the NH has more impact on the recharge-discharge of the equatorial WWV. The north-south asymmetry of the WWV transport, which is interpreted based on the linear Rossby theory, is related with the southward migration of westerly wind and the negative wind curl over the northwestern off-equatorial region after the mature stage of ENSO.

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