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Deep ocean warming assessed from altimeters, GRACE, 3 in-situ measurements, and a non-Boussinesq OGCM

Show simple item record Song, Y. Tony Colberg, Frank 2012-08-08T16:29:35Z 2012-08-08T16:29:35Z 2011-02-15
dc.identifier.citation Journal of Geophysical Research, Vol. 116, C02020, doi:10.1029/2010JC006601, 2011 en_US
dc.identifier.clearanceno 11-0098
dc.description.abstract Observational surveys have shown significant oceanic bottom water warming, but they are too spatially and temporally sporadic to quantify the deep ocean contribution to the present-day sea level rise (SLR). In this study, altimetry sea surface height (SSH), Gravity Recovery and Climate Experiment (GRACE) ocean mass, and in situ upper ocean (0–700 m) steric height have been assessed for their seasonal variability and trend maps. It is shown that neither the global mean nor the regional trends of altimetry SLR can be explained by the upper ocean steric height plus the GRACE ocean mass. A non-Boussinesq ocean general circulation model (OGCM), allowing the sea level to rise as a direct response to the heat added into the ocean, is then used to diagnose the deep ocean steric height. Constrained by sea surface temperature data and the top of atmosphere (TOA) radiation measurements, the model reproduces the observed upper ocean heat content well. Combining the modeled deep ocean steric height with observational upper ocean data gives the full depth steric height. Adding a GRACE-estimated mass trend, the data-model combination explains not only the altimetry global mean SLR but also its regional trends fairly well. The deep ocean warming is mostly prevalent in the Atlantic and Indian oceans, and along the Antarctic Circumpolar Current, suggesting a strong relation to the oceanic circulation and dynamics. Its comparison with available bottom water measurements shows reasonably good agreement, indicating that deep ocean warming below 700 m might have contributed 1.1 mm/yr to the global mean SLR or one-third of the altimeter-observed rate of 3.11 ± 0.6 mm/yr over 1993–2008. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher the American Geophysical Union en_US
dc.subject deep ocean warming en_US
dc.subject sea level en_US
dc.subject satellite observation en_US
dc.subject in situ measurement en_US
dc.subject ocean modeling en_US
dc.title Deep ocean warming assessed from altimeters, GRACE, 3 in-situ measurements, and a non-Boussinesq OGCM en_US
dc.type Article en_US
dc.subject.NASATaxonomy Meteorology and Climatology en_US
dc.subject.NASATaxonomy Oceanography en_US

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