Articles | Volume 15, issue 10
Brief communication
29 Oct 2021
Brief communication |  | 29 Oct 2021

Brief communication: The anomalous winter 2019 sea-ice conditions in McMurdo Sound, Antarctica

Greg H. Leonard, Kate E. Turner, Maren E. Richter, Maddy S. Whittaker, and Inga J. Smith

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Manuscript not accepted for further review
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Cited articles

Arrigo, K. R. and van Dijken, G. L.: Impact of iceberg C-19 on Ross Sea primary production, Geophys. Res. Lett., 30, 1836,, 2003. a
Banwell, A. F., Willis, I. C., Macdonald, G. J., Goodsell, B., Mayer, D. P., Powell, A., and Macayeal, D. R.: Calving and rifting on the McMurdo Ice Shelf, Antarctica, Ann. Glaciol., 58, 78–87,, 2017. a
Brett, G. M., Irvin, A., Rack, W., Haas, C., Langhorne, P. J., and Leonard, G. H.: Variability in the Distribution of Fast Ice and the Sub-ice Platelet Layer Near McMurdo Ice Shelf, J. Geophys. Res.-Oceans, 125, e2019JC015678,, 2020. a, b
Brunt, K. M., Sergienko, O., and MacAyeal, D. R.: Observations of unusual fast-ice conditions in the southwest Ross Sea, Antarctica: preliminary analysis of iceberg and storminess effects, Ann. Glaciol., 44, 183–187,, 2006. a, b, c, d, e, f, g
Cassano, J. J., Nigro, M. A., and Lazzara, M. A.: Characteristics of the near-surface atmosphere over the Ross Ice Shelf, Antarctica, J. Geophys. Res.-Atmos., 121, 3339–3362,, 2016. a
Short summary
McMurdo Sound sea ice can generally be partitioned into two regimes: a stable fast-ice cover forming south of approximately 77.6° S and a more dynamic region north of 77.6° S that is regularly impacted by polynyas. In 2019, a stable fast-ice cover formed unusually late due to repeated break-out events. This subsequently affected sea-ice operations in the 2019/20 field season. We analysed the 2019 sea-ice conditions and found a strong correlation with unusually large southerly wind events.