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Revisiting the ocean’s non-isostatic response to 5-day atmospheric loading: New results based on global bottom pressure records and numerical modeling

Revisiting the ocean’s non-isostatic response to 5-day atmospheric loading: New results based on... <jats:title>Abstract</jats:title><jats:p>We use bottom pressure records from 59 sites of the global tsunami warning system to examine the non-isostatic response of the World Ocean to surface air pressure forcing within the 4 to 6-day band. It is within this narrow “5-day” band that sea level fluctuations strongly depart from the isostatic inverted barometer response. Numerical simulations of the observed bottom pressures were conducted using a two-dimensional Princeton Ocean Model forced at the upper boundary by two versions of the air pressure loading: (a) an analytical version having the form of the westward propagating, 5-day Rossby-Haurwitz air pressure mode; and (b) an observational version based on a 16-year record of global-scale atmospheric reanalysis data with a spatial resolution of 2.5°. Simulations from the two models – consisting of barotropic standing waves of millibar amplitudes and near uniform phases in the Pacific, Atlantic and Indian oceans – are in close agreement and closely reproduce the observed bottom pressures. The marked similarity of the outputs from the two models and the ability of both models to accurately reproduce the seafloor pressure records indicates a pronounced dynamic response of the World Ocean to non-stationary air pressure fields resembling the theoretical Rossby-Haurwitz air pressure mode.</jats:p> http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography CrossRef

Revisiting the ocean’s non-isostatic response to 5-day atmospheric loading: New results based on global bottom pressure records and numerical modeling

Journal of Physical OceanographyJun 28, 2021

Revisiting the ocean’s non-isostatic response to 5-day atmospheric loading: New results based on global bottom pressure records and numerical modeling


Abstract

<jats:title>Abstract</jats:title><jats:p>We use bottom pressure records from 59 sites of the global tsunami warning system to examine the non-isostatic response of the World Ocean to surface air pressure forcing within the 4 to 6-day band. It is within this narrow “5-day” band that sea level fluctuations strongly depart from the isostatic inverted barometer response. Numerical simulations of the observed bottom pressures were conducted using a two-dimensional Princeton Ocean Model forced at the upper boundary by two versions of the air pressure loading: (a) an analytical version having the form of the westward propagating, 5-day Rossby-Haurwitz air pressure mode; and (b) an observational version based on a 16-year record of global-scale atmospheric reanalysis data with a spatial resolution of 2.5°. Simulations from the two models – consisting of barotropic standing waves of millibar amplitudes and near uniform phases in the Pacific, Atlantic and Indian oceans – are in close agreement and closely reproduce the observed bottom pressures. The marked similarity of the outputs from the two models and the ability of both models to accurately reproduce the seafloor pressure records indicates a pronounced dynamic response of the World Ocean to non-stationary air pressure fields resembling the theoretical Rossby-Haurwitz air pressure mode.</jats:p>

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Publisher
CrossRef
ISSN
0022-3670
DOI
10.1175/jpo-d-21-0025.1
Publisher site
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Abstract

<jats:title>Abstract</jats:title><jats:p>We use bottom pressure records from 59 sites of the global tsunami warning system to examine the non-isostatic response of the World Ocean to surface air pressure forcing within the 4 to 6-day band. It is within this narrow “5-day” band that sea level fluctuations strongly depart from the isostatic inverted barometer response. Numerical simulations of the observed bottom pressures were conducted using a two-dimensional Princeton Ocean Model forced at the upper boundary by two versions of the air pressure loading: (a) an analytical version having the form of the westward propagating, 5-day Rossby-Haurwitz air pressure mode; and (b) an observational version based on a 16-year record of global-scale atmospheric reanalysis data with a spatial resolution of 2.5°. Simulations from the two models – consisting of barotropic standing waves of millibar amplitudes and near uniform phases in the Pacific, Atlantic and Indian oceans – are in close agreement and closely reproduce the observed bottom pressures. The marked similarity of the outputs from the two models and the ability of both models to accurately reproduce the seafloor pressure records indicates a pronounced dynamic response of the World Ocean to non-stationary air pressure fields resembling the theoretical Rossby-Haurwitz air pressure mode.</jats:p>

Journal

Journal of Physical OceanographyCrossRef

Published: Jun 28, 2021

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