Arctic Sea Level During the Satellite Altimetry Era

A. Carret*, J. A. Johannessen, Ole Baltazar Andersen, M. Ablain, Pierre Prandi, A Velazquez-Blazquez, A. Cazenave

*Corresponding author for this work

    Research output: Contribution to journalReviewpeer-review

    Abstract

    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
    Publication statusPublished - 2017

    Keywords

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

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