Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusm.g31b..05d&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #G31B-05
Physics
1223 Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), 1239 Earth Rotation Variations, 3339 Ocean/Atmosphere Interactions (0312, 4504), 4560 Surface Waves And Tides (1222)
Scientific paper
Ten years ago, I developed a theoretical approach for determining the dynamic response of the oceans to atmospheric pressure variations, allowing its effects on Earth rotation to be inferred. This approach required the construction of Green's functions representing the oceans' response to unit-amplitude pressure variations over different spatial and temporal scales (i.e. different spherical harmonic degrees and orders, and different frequencies of forcing). When combined with the observed atmospheric pressure field, previously decomposed into spherical harmonic coefficients at each time interval, these Green's functions would then yield the effects of the `dynamic barometer' (DB) oceanic response on Earth's rotation. The Green's functions were computed by modifying a spherical harmonic ocean tide model I had previously developed; this model, unlike traditional numerical models of ocean tides, was not limited to degree 2 harmonic forcing or to luni-solar tidal frequencies. Long-period predictions from the spherical harmonic model were found to be consistent with tide observations, e.g. for the lunar fortnightly tide; but short-period tidal predictions were not, probably due to the coarse spatial resolution (to harmonic degree and order 36) of the coastlines and ocean bathymetry. As a consequence, the Green's functions I calculated, and the DB results I published (J. Geophys. Res., 1998), were restricted to time scales of at least a few days. In an attempt to extend the results to shorter periods, I have expanded the harmonic description of the ocean basins to degree and order 180. In this talk I will evaluate the luni-solar tidal predictions of my tide model with low-resolution versus high-resolution oceans. However, at this point the most severe obstacle to achieving an expanded, high-frequency description of the DB and its effects on rotation appears to be computer processing time.
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