Arctic Sea Level Budget Assessment during the GRACE/Argo Time Period

Roshin P. Raj*, Ole B. Andersen, Johnny A. Johannessen, Benjamin D. Gutknecht, Sourav Chatterjee, Stine Rose, Antonio Bonaduce, Martin Horwath, Heidi Ranndal, Kristin Richter, Hindumathi Palanisamy, Carsten A. Ludwigsen, Laurent Bertino, J. Even Ø. Nilsen, Per Knudsen, Anna Hogg, Anny Cazenave, Jérôme Benveniste

*Corresponding author for this work

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    Abstract

    Sea level change is an important indicator of climate change. Our study focuses on the sea level budget assessment of the Arctic Ocean using: (1) the newly reprocessed satellite altimeter data with major changes in the processing techniques; (2) ocean mass change data derived from GRACE satellite gravimetry; (3) and steric height estimated from gridded hydrographic data for the GRACE/Argo time period (2003–2016). The Beaufort Gyre (BG) and the Nordic Seas (NS) regions exhibit the largest positive trend in sea level during the study period. Halosteric sea level change is found to dominate the area averaged sea level trend of BG, while the trend in NS is found to be influenced by halosteric and ocean mass change effects. Temporal variability of sea level in these two regions reveals a significant shift in the trend pattern centered around 2009–2011. Analysis suggests that this shift can be explained by a change in large-scale atmospheric circulation patterns over the Arctic. The sea level budget assessment of the Arctic found a residual trend of more than 1.0 mm/yr. This nonclosure of the sea level budget is further attributed to the limitations of the three above mentioned datasets in the Arctic region.
    Original languageEnglish
    Article number2837
    JournalRemote Sensing
    Volume12
    Issue number17
    Number of pages21
    ISSN2072-4292
    DOIs
    Publication statusPublished - 2020

    Bibliographical note

    This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

    Keywords

    • Sea level
    • Satellite altimetry
    • GRACE
    • Ocean mass change
    • Steric height
    • Arctic Oscillation
    • Arctic dipole
    • Cryosat-2
    • Nordic Seas
    • Beaufort Gyre

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