Arctic Sea Level During the Satellite Altimetry Era

Publication: Research - peer-reviewReview – Annual report year: 2017

DOI

  • Author: Carret, A.

    Laboratoire d’Études en Géophysique et Océanographie Spatiales, France

  • Author: Johannessen, J. A.

    Nansen Environmental and Remote Sensing Center, Norway

  • Author: Andersen, Ole Baltazar

    Geodesy, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Ablain, M.

    CLS Satellite Oceanography Division, France

  • Author: Prandi, Pierre

    CLS Satellite Oceanography Division, France

  • Author: Velazquez-Blazquez, A

    Laboratoire d’Études en Géophysique et Océanographie Spatiales, France

  • Author: Cazenave, A.

    Laboratoire d’Études en Géophysique et Océanographie Spatiales, France

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Results of the sea-level budget in the high latitudes (up to 80°N) and the Arctic Ocean during the satellite altimetry era. We investigate the closure of the sea-level budget since 2002 using two altimetry sea-level datasets based on the Envisat waveform retracking: temperature and salinity data from the ORAP5 reanalysis, and Gravity Recovery And Climate Experiment (GRACE) space gravimetry data to estimate the steric and mass components. Regional sea-level trends seen in the altimetry map, in particular over the Beaufort Gyre and along the eastern coast of Greenland, are of halosteric origin. However, in terms of regional average over the region ranging from 66°N to 80°N, the steric component contributes little to the observed sea-level trend, suggesting a dominant mass contribution in the Arctic region. This is confirmed by GRACE-based ocean mass time series that agree well with the altimetry-based sea-level time series. Direct estimate of the mass component is not possible prior to GRACE. Thus, we estimated the mass contribution from the difference between the altimetry-based sea level and the steric component. We also investigate the coastal sea level with tide gauge records. Twenty coupled climate models from the CMIP5 project are also used. The models lead us to the same conclusions concerning the halosteric origin of the trend patterns.

Original languageEnglish
JournalSurveys in Geophysics
Volume38
Issue number1
Pages (from-to)251-275
ISSN0169-3298
DOIs
StatePublished - 2017
CitationsWeb of Science® Times Cited: 0

    Keywords

  • Arctic Ocean, CMIP5 models, Ocean mass, Satellite altimetry, Sea-level change, Steric sea level
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