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    An observing system simulation experiment for the calibration and validation of the surface water ocean topography sea surface height measurement using in situ platforms

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    jtech-d-17-0076.1.pdf (2.307Mb)
    Date
    2018-02-07
    Author
    Wang, Jinbo  Concept link
    Fu, Lee-Lueng  Concept link
    Qiu, Bo  Concept link
    Menemenlis, Dimitris  Concept link
    Farrar, J. Thomas  Concept link
    Chao, Yi  Concept link
    Thompson, Andrew F.  Concept link
    Flexas, M. Mar  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10304
    As published
    https://doi.org/10.1175/JTECH-D-17-0076.1
    DOI
    10.1175/JTECH-D-17-0076.1
    Keyword
     Altimetry; In situ oceanic observations; Profilers, oceanic; Satellite observations; Sensitivity studies; Planning 
    Abstract
    The wavenumber spectrum of sea surface height (SSH) is an important indicator of the dynamics of the ocean interior. While the SSH wavenumber spectrum has been well studied at mesoscale wavelengths and longer, using both in situ oceanographic measurements and satellite altimetry, it remains largely unknown for wavelengths less than ~70 km. The Surface Water Ocean Topography (SWOT) satellite mission aims to resolve the SSH wavenumber spectrum at 15–150-km wavelengths, which is specified as one of the mission requirements. The mission calibration and validation (CalVal) requires the ground truth of a synoptic SSH field to resolve the targeted wavelengths, but no existing observational network is able to fulfill the task. A high-resolution global ocean simulation is used to conduct an observing system simulation experiment (OSSE) to identify the suitable oceanographic in situ measurements for SWOT SSH CalVal. After fixing 20 measuring locations (the minimum number for resolving 15–150-km wavelengths) along the SWOT swath, four instrument platforms were tested: pressure-sensor-equipped inverted echo sounders (PIES), underway conductivity–temperature–depth (UCTD) sensors, instrumented moorings, and underwater gliders. In the context of the OSSE, PIES was found to be an unsuitable tool for the target region and for SSH scales 15–70 km; the slowness of a single UCTD leads to significant aliasing by high-frequency motions at short wavelengths below ~30 km; an array of station-keeping gliders may meet the requirement; and an array of moorings is the most effective system among the four tested instruments for meeting the mission’s requirement. The results shown here warrant a prelaunch field campaign to further test the performance of station-keeping gliders.
    Description
    Author Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 35 (2018): 281-297, doi:10.1175/JTECH-D-17-0076.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Atmospheric and Oceanic Technology 35 (2018): 281-297
     

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