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    Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns

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    2004JC002772.pdf (923.3Kb)
    Date
    2005-09-02
    Author
    Kanzow, Torsten  Concept link
    Flechtner, Frank  Concept link
    Chave, Alan D.  Concept link
    Schmidt, Roland  Concept link
    Schwintzer, Peter  Concept link
    Send, Uwe  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3608
    As published
    https://doi.org/10.1029/2004JC002772
    DOI
    10.1029/2004JC002772
    Keyword
     Gravity; Geoid; Ocean bottom pressure; Deep ocean currents; Ocean tides; In situ measurements 
    Abstract
    The Gravity Recovery and Climate Experiment (GRACE) processing centers at the GeoForschungsZentrum Potsdam (GFZ) and the University of Texas Center for Space Research (UTCSR) provide time series of monthly gravity field solutions covering the period since mission launch in March 2002. Although the achieved accuracy still remains an order of magnitude below the mission's baseline goal, these time series have successfully been used to study terrestrial phenomena such as water storage variations. Over the oceans, the monthly gravity field solutions can be converted into estimates of the fluctuating ocean bottom pressure (OBP), which is the sum of atmospheric and oceanic mass variations. The GRACE products may be validated against in situ OBP observations which are available from a ground truth site in the tropical northwest Atlantic Ocean. Large differences are observed between the in situ and GRACE-derived OBP which are investigated by comparing the tidal and nontidal ocean models used at GFZ and UTCSR for dealiasing short-term (<2 months) mass variations from satellite measurements. Results show that the barotropic nontidal and tide models need improvement at periods shorter than 1 day and longer than 2 weeks. On a global scale the monthly OBP fields from GRACE generally overestimate the variability compared to ocean general circulation models, especially in tropical regions. This may be attributed to continuing deficiencies in GRACE data processing. Nevertheless, there is some initial evidence that GRACE possesses the potential to observe large-scale averages of bottom pressure fluctuations.
    Description
    Author Posting. © American Geophysical Union, 2005. 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 110 (2005): C09001, doi:10.1029/2004JC002772.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Journal of Geophysical Research 110 (2005): C09001
     

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