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Circulation of the North Atlantic Ocean from altimetry and the Gravity Recovery and Climate Experiment geoid

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dc.contributor.author Jayne, Steven R.
dc.date.accessioned 2010-06-08T19:10:49Z
dc.date.available 2010-06-08T19:10:49Z
dc.date.issued 2006-03-04
dc.identifier.citation Journal of Geophysical Research 111 (2006): C03005 en_US
dc.identifier.uri http://hdl.handle.net/1912/3609
dc.description Author Posting. © American Geophysical Union, 2006. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 111 (2006): C03005, doi:10.1029/2005JC003128. en_US
dc.description.abstract We discuss the ocean circulation derived from the temporally averaged sea surface height, which is referenced to the recently released geoid from the Gravity Recovery and Climate Experiment (GRACE) mission (GRACE Gravity Model 02 (GGM02)). The creation of a precise, independent geoid allows for the calculation of the reference gravitational potential undulation surface, which is associated with the resting ocean surface height. This reference height is then removed from the temporally averaged sea surface height, leaving the dynamic ocean topography. At its most basic level the dynamic ocean topography can be related to the ocean's surface circulation through geostrophy. This has previously been impracticable because of large uncertainties in previous estimates of the Earth's geoid. Prior geoids included the temporally averaged sea surface from altimeters as a proxy for the geoid and therefore were unsuitable for calculations of the ocean's circulation. Geoid undulations are calculated from the GRACE geoid and compared to those from the NASA Goddard Space Flight Center and National Imagery and Mapping Agency Joint Earth Geopotential Model (EGM96) geoid. Error estimates are made to assess the accuracy of the new geoid. The deep ocean pressure field is also estimated by combining the calculated dynamic ocean topography with hydrography. Finally, the derived circulation is compared to independent observations of the circulation from sea surface drifters and subsurface floats. It is shown that the GGM02 geoid is significantly more accurate for use in estimating the ocean's circulation. en_US
dc.description.sponsorship This work was supported by grants NNG04GE95G from the National Aeronautics and Space Administration and OCE 01-37122 from the National Science Foundation and the Young Investigator Program award N00014-03-1-0545 from the Office of Naval Research. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2005JC003128
dc.subject Ocean circulation en_US
dc.subject Geoid en_US
dc.subject Altimetry index en_US
dc.title Circulation of the North Atlantic Ocean from altimetry and the Gravity Recovery and Climate Experiment geoid en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2005JC003128


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