Near 5-day nonisostatic response of the Atlantic Ocean to atmospheric surface pressure deduced from sub-surface and bottom pressure measurements

Details Near 5-day nonisostatic response of the Atlantic Ocean to atmospheric surface pressure deduced from sub-surface and bottom pressure measurements Near 5-day nonisostatic response of the Atlantic Ocean to atmospheric surface pressure deduced from sub-surface and bottom pressure measurements

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312610p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 12, CiteID L12610

Physics

1

Oceanography: Physical: Air/Sea Interactions (0312, 3339), Oceanography: Physical: Sea Level: Variations And Mean (1222, 1225, 1641), Oceanography: General: Time Series Experiments (1872, 3270, 4475)

Scientific paper

Nonisostatic ocean responses to atmospheric pressure have been observed in tropical regions of the Pacific and Atlantic Oceans at periods near 5 days. Barotropic ocean model simulations coupled to atmospheric forcing predicted that this nonisostatic ocean response is driven not regionally but globally by the Rossby-Haurwitz wave. To date little observational evidence has been provided to support the model simulations, especially at extratropical latitudes. Here we present the basin-scale nature of the nonisostatic response in the Atlantic Ocean near 5-day periods using four historical long-term (>=1.5 year) sub-surface and bottom pressure measurements spanning from 16°S to 37°N. Joint analysis of them together with global-gridded atmospheric pressure reveals a basin-scale nonisostatic sea level fluctuation in the North and tropical Atlantic Oceans near 5-day periods with almost uniform phase. It also confirms that the driving force for this near 5-day fluctuation is the westward propagating Rossby-Haurwitz wave.

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