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The Arctic Ocean surface and bottom circulation estimated from altimetry and hydrography

Urheber*innen

Kallmyr,  Jan-Adrian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nilsson,  Johan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Isachsen,  Pål Erik
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sjur,  Anna Lina Petruseviciute
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chafik,  Léon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Kallmyr, J.-A., Nilsson, J., Isachsen, P. E., Sjur, A. L. P., Chafik, L. (2023): The Arctic Ocean surface and bottom circulation estimated from altimetry and hydrography, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4104


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021543
Zusammenfassung
The number of direct observations of ocean currents in the central Arctic are still limited. Here, the Arctic Ocean Circulation is studied using available altimetric, bathymetric and hydrographic data sets. Based on earlier theoretical frameworks of the Arctic Ocean Circulation, such as Nøst and Isachsen (2003), key concepts such as topographic steering of the flow field, and the degree to which it is eqvivalently barotropic are evaluated. It is found that the surface flow, which is derived from altimetry, is generally aligned along large-scale depth contours. A closer study of central regions in the Arctic Mediterranean also show high alignment along local depth contours in both the Nordic Seas and the Arctic Ocean. While the bottom flow is estimated through thermal wind balance, and as such have a lower horizontal resolution, many of the same features are seen, suggesting that the circulation is generally eqvivalent barotropic. Local regions of cross-slope flow are identified as areas of inflow (outflow) to (from) the Arctic Ocean, suggesting that the local relative vorticity is enough to break topographic steering in these regions. Addtionally, different hydrographic data sets yield slightly different thermal wind velocities, but which can affect the direction and magnitude of the bottom flow.