Improving ocean angular momentum estimates using a model constrained by data

Details Improving ocean angular momentum estimates using a model constrained by data Improving ocean angular momentum estimates using a model constrained by data

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1775p&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 9, p. 1775-1778

Physics

20

Geodesy And Gravity: Rotational Variations, Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions, Oceanography: General: Numerical Modeling, Oceanography: Physical: General Circulation

Scientific paper

Ocean angular momentum (OAM) calculations using forward model runs without any data constraints have recently revealed the effects of OAM variability on the Earth's rotation. Here we use an ocean model and its adjoint to estimate OAM values by constraining the model to available oceanic data. The optimization procedure yields substantial changes in OAM, related to adjustments in both motion and mass fields, as well as in the wind stress torques acting on the ocean. Constrained and unconstrained OAM values are discussed in the context of closing the planet's angular momentum budget. The estimation procedure yields noticeable improvements in the agreement with the observed Earth rotation parameters, particularly at the seasonal timescale. The comparison with Earth rotation measurements provides an independent consistency check on the estimated ocean state and underlines the importance of ocean state estimation for quantitative studies of the variable large-scale oceanic mass and circulation fields, including studies of OAM.

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