Ocean Access to Zachariæ Isstrøm Glacier, Northeast Greenland, Revealed by OMG Airborne Gravity
2020
Yang, Junjun | Luo, Zhicai | Tu, Liangcheng
Seafloor topography shapes the pathways of ocean currents transporting ocean heat and, thus, is a fundamental boundary condition for modeling ocean‐ice interactions. However, few ship bathymetric data are available on the inner continental shelf of northeast Greenland due to the year‐round presence of sea ice. We infer seafloor topography of this region from airborne gravity anomaly measured by National Aeronautics and Space Administration's Oceans Melting Greenland (OMG) mission through a nonlinear inversion method called simulated annealing and results in a model with 1.95–3.9 km resolution and 52 m accuracy. The model provides a view of the seafloor near Zachariæ Isstrøm and reveals previously unknown topographic features such as a 370–560 m deep trough that enables warm subsurface water to reach Jøkelbugten fjord into which Zachariæ Isstrøm drains. Present bathymetric models do not show deep enough troughs near Jøkelbugten fjord allowing the inflow of warm water.
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