首页|Numerical simulation of the dynamic effects of grounding icebergs on summer circulation in Prydz Bay, Antarctica

Numerical simulation of the dynamic effects of grounding icebergs on summer circulation in Prydz Bay, Antarctica

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The Regional Ocean Modeling System (ROMS) is employed to create a three-dimensional numerical model of the summer circulation in the Prydz Bay region, Antarctica. Consistent with the currents measured using an underway acoustic Doppler current profiler during a Chinese cruise, the simulated current field illustrates the major features of the Prydz Bay circulation, including the Antarctic Slope Current (ASC) along the continental shelf break, the cyclonic Prydz Bay Gyre, and the Prydz Bay Eastern Coastal Current (PBECC). The effects of grounding icebergs D15 and B15 on the circulation in Prydz Bay are investigated via numerical simulations. The results indicate that these giant grounding icebergs substantially affect the flows into and within the bay, which may differ with the different grounding locations. As grounding iceberg D15 is located close to the southwestern part of the West Ice Shelf (WIS), it cuts off the coastal current along the outer edge of the WIS, and the ASC can only enter Prydz Bay from the west side of iceberg D15, whereupon it becomes a main source of the PBECC. Iceberg D15 also weakens the circulation in the bay in general. The relatively small iceberg B15 entered Prydz Bay from 2007 to 2009 and grounded on the southwestern section of the Four Ladies Bank. The numerical experiments indicate that iceberg B15 guides the ASC flowing into the bay around its west side and reduces the width of the inflow on the eastern side of the Prydz Bay Channel. The grounding of iceberg B15 has also led to adjustments of the circulation within the bay, among which the most significant is that the outflow along the western flank of Fram Bank has shifted to the west and become more intensive.

circulationgrounding icebergnumerical simulationPrydz BayAntarctica

HAN Yuxin、SHI Jiuxin、HOU Saisai、XIAO Changhao

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Physical Oceanography Laboratory,Ocean University of China,Qingdao 266100,China

Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China

National NaturalScience Foundation of ChinaNational Key Research and Development Program of ChinaNational Polar Special Program

419762172018YFA0605701IRASCC2020-2022-01-01

2022

10.13679/j.advps.2022.0002

极地科学进展(英文版)
中国极地研究中心,国家海洋局极地考察办公室 (Polar Research Institute of China, Chinese Arctic and Antarctic Administration)

极地科学进展(英文版)

CSCD
影响因子：0.145
ISSN：1674-9928
年,卷(期)：2022.33(2)
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