Journal
CRYOSPHERE
Volume 15, Issue 10, Pages 4999-5006Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/tc-15-4999-2021
Keywords
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Funding
- Marsden Fund [MFP-UOO1825]
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In 2019, the sea ice conditions in McMurdo Sound were unusual, with a late formation of stable fast-ice cover correlated strongly with several unusually large southerly wind events.
McMurdo Sound sea ice can generally be partitioned into two regimes: (1) a stable fast-ice cover, forming south of approximately 77.6 degrees S around March-April and then breaking out the following January-February, and (2) a more dynamic region north of 77.6 degrees S that the McMurdo Sound and Ross Sea polynyas regularly impact. In 2019, a stable fast-ice cover formed unusually late due to repeated break-out events. We analyse the 2019 sea-ice conditions and relate them to a modified storm index (MSI), a proxy for southerly wind events. We find there is a strong correlation between the timing of break-out events and several unusually large MSI events.
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