Observing ocean heat content using satellite gravity and altimetry

Details Observing ocean heat content using satellite gravity and altimetry Observing ocean heat content using satellite gravity and altimetry

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgrc..108.3031j&link_type=abstract

Journal of Geophysical Research (Oceans), Volume 108, Issue C2, pp. 13-1, CiteID 3031, DOI 10.1029/2002JC001619

Statistics

Methodology

10

Geodesy And Gravity: Planetary Geodesy And Gravity (5420, 5714, 6019), Oceanography: Physical: Sea Level Variations, Geodesy And Gravity: Ocean/Earth/Atmosphere Interactions (3339), Geodesy And Gravity: Space Geodetic Surveys, Oceanography: General: Remote Sensing And Electromagnetic Processes (0689)

Scientific paper

A method for combining satellite altimetry observations with satellite measurements of the Earth's time-varying gravity to give improved estimates of the ocean's heat storage is presented. Over the ocean the time-variable component of the geoid can be related to the time-varying bottom pressure. The methodology of estimating the ocean's time-varying heat storage using altimetric observations alone is modified to include observations of bottom pressure. A detailed error analysis of the methodology is undertaken. It is found that the inclusion of bottom pressure improves the ocean heat storage estimates. The improvement comes from a better estimation of the steric sea surface height by the inclusion of bottom pressure in the calculation, over using the altimeter-observed sea surface height alone. On timescales of the annual cycle and shorter the method works particularly well. However, long-timescale changes in the heat storage are poorly reproduced because of deficiencies in the methodology and the presence of contaminating signals in the bottom pressure observations.

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