The Getz Ice Shelf (GIS) produces major amounts of basal meltwater due to intrusions of warm modified Circumpolar Deep Water (mCDW) beneath the ice shelf. However, multiple cavity openings and complex geography mean that knowledge of bathymetry beneath the GIS is required to understand ice/ocean interactions. We invert NASA airborne gravity data to obtain bathymetry beneath the ice shelf. Our gravity/geology‐constrained bathymetry is a significant advance on Bedmap2 bathymetry. The sub‐ice shelf bathymetry consists of three cavities separated by topographic ridges extending from the ice shelf front to the grounding line. Passages allowing limited circulation of shallow (≲400 meters below sea level [mbsl]) water between cavities are present, but deeper water is confined to individual cavities. Within each cavity, bathymetric troughs (>900 mbsl) extend from the ice shelf front to subglacial valleys beneath the ice sheet. Our analysis of the gravity data also allows us to infer the presence of thick (>500 m) sediments near the grounding line through much of the GIS, as well as variations in the density and/or thickness of the crust underlying the ice shelf.

中文翻译：

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南极西部格兹冰架下面大陆架的详细测深

盖茨冰架（GIS）由于冰架下面温暖的改良的极地深水（mCDW）的侵入而产生大量的基础熔体水。但是，由于有多个洞口和复杂的地理环境，因此需要了解GIS下的测深知识，才能了解冰海相互作用。我们将NASA的空中重力数据求反，以获取冰架下方的测深图。我们的重力/地质约束测深仪是Bedmap2测深仪的一项重大进步。副冰架测深法由三个空腔组成，这些空腔由从冰架前部延伸到接地线的地形脊隔开。在空腔之间存在允许浅水（低于海平面[mbsl]约400米）的有限循环的通道，但较深的水仅限于各个空腔。在每个腔内，测深槽（> 900 mbsl）从冰架前部延伸至冰盖下方的冰河谷。通过对重力数据的分析，我们还可以通过许多GIS推断出接地线附近是否存在厚厚的沉积物（> 500 m），以及冰架下面的地壳的密度和/或厚度的变化。