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Conference Paper

Interannual variation of modified Circumpolar Deep Water volume in the Dotson-Getz Trough, West Antarctica

Authors

Kim,  Tae-Wan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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

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

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Citation

Kim, T.-W., Yang, H., Kim, Y., Yoo, J., Park, J. (2023): Interannual variation of modified Circumpolar Deep Water volume in the Dotson-Getz Trough, West Antarctica, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0761


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016716
Abstract
In recent decades, wide-spread thinning of ice shelves in the Amundsen Sea has been recorded driven by basal melting. Relatively warm modified Circumpolar Deep Water (mCDW) flows onto the continental shelf and fills the Dotson-Getz Trough (DGT) and reaches the base of the Dotson Ice Shelf (DIS). Long-term hydrographic data (2007–2018) for the DGT were obtained during seven oceanographic surveys to study the interannual variation in mCDW volume and properties in the DGT and their causes. Although the mCDW volume showed relatively weak interannual variations at the entrance of the DGT, these variations intensified in front of the DIS. There, the mCDW volume was ~8 × 103 km3 in 2007, rapidly decreased to 4.7 × 103 km3 in 2014 before rebounding to 7.3 × 103 km3 in 2018. Such interannual variability appears to result from local Ekman pumping along the DGT, with the dominant south-southeast wind modulating the amplitude of Ekman upwelling along the eastern boundary of the Amundsen Sea polynya during the austral summers of the surveyed years. We note a strong correlation between the wind variability and the longitudinal location of the Amundsen Sea Low.