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Wed 04 Nov 15:00: TBD The talk will be online. Contact the host to get Zoom details.

Wed, 26/08/2020 - 13:48
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Wed 21 Oct 14:00: Seasonal prediction and predictability of regional Antarctic sea ice The talk will be online. Contact the host to get Zoom details.

Wed, 26/08/2020 - 13:47
Seasonal prediction and predictability of regional Antarctic sea ice

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Wed 07 Oct 14:00: TBD The talk will be online. Contact the host to get Zoom details.

Wed, 26/08/2020 - 13:47
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Wed 23 Sep 16:00: TBD The talk will be online. Contact the host to get Zoom details.

Wed, 26/08/2020 - 13:46
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Wed 09 Sep 15:00: TBD The talk will be online. Contact the host to get Zoom details.

Wed, 26/08/2020 - 13:46
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Wed 02 Dec 10:00: TBD

Wed, 26/08/2020 - 13:42
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Wed 18 Nov 16:00: TBD

Wed, 26/08/2020 - 13:41
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Wed 04 Nov 15:00: TBD

Wed, 26/08/2020 - 13:39
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Wed 08 Jul 10:00: Influences of Melt Water from Sea Ice/Ice Shelf in Polar Oceans The talk will be online. Contact the host to get Zoom details.

Wed, 08/07/2020 - 08:28
Influences of Melt Water from Sea Ice/Ice Shelf in Polar Oceans

Fresh melt water from sea ice and ice shelf is not only essential to the ocean hydrography but the mesoscale dynamics due to the induced baroclinicity. Warm intrusions from the Bering Strait transport heat and nutrients via baroclinic eddies vertically beneath the sea ice and laterally across structural fronts near the ice edge in the eastern Chukchi Sea. Numerical models using the Regional Ocean Model System (ROMS) are integrated to systematically investigate the importance of the baroclinic eddy field and the factors that affect its dynamics, specifically on the stratifications determined by the fresh water volume. Model results show a noticeable effect of strong wind events on ice edge displacement. The advection of ice away from or toward the inflow changes the ice melt rate and the salinity of the melt water plume, both are the factors that important to the heat transported by baroclinic instability and further feedback to the ice melt rate. Similar mechanisms can be found elsewhere around the ice fronts of sea ice and ice shelves,it is worth studying with more systematically models of the other regional oceans to explore the coincidences and dissimilarities.

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Wed 15 Jul 16:00: Ikaaġvik Sikukun: Bridging the Scientific and Indigenous Communities to Study Sea Ice Change in Arctic Alaska The talk will be online. Contact the host to get Zoom details.

Wed, 08/07/2020 - 08:28
Ikaaġvik Sikukun: Bridging the Scientific and Indigenous Communities to Study Sea Ice Change in Arctic Alaska

Taking its name from the Iñupiaq phrase for “ice bridge” the Ikaaġvik Sikukun project has successfully built bridges between a diverse team of scientists and Indigenous Knowledge-holders to study the changing sea-ice environment of Kotzebue Sound, Alaska. We have broken new ground by co-producing our hypotheses in partnership with an Indigenous Elder advisory council to develop research questions that cut across disciplinary boundaries and address the needs of both the local and scientific communities. To share our story broadly and in a way that respects the oral traditions of Indigenous Knowledge, our team also includes an ethnographic film-maker who has been documenting each step of our unique research journey. Over the past three years, with continued guidance from our advisory council, we have designed and carried out a research plan to observe the sea ice and marine mammals in Kotzebue Sound and how these come together as habitat and hunting grounds. Using satellite data, unmanned aerial systems (UAS), oceanographic moorings and on-ice measurements we have witnessed two exceptional years (2018 and 2019) with unprecedentedly low sea ice extent and the earliest start of bearded seal (Erignathus barbatus) hunting in recent memory – contributing to a broader trend towards shorter spring hunting seasons, which have been recorded in Kotzebue since 2003. We also observed widespread flooding of the landfast ice, possibly caused by relatively high snowfall on top of thin ice, as well as the detachment and fragmentation of landfast ice recently occupied by ringed seal (Phoca hispida) pups, adults, and their lairs. Having integrated Indigenous Knowledge throughout our approach, we are now in a unique position to turn these interrelated observations into answers to our research questions. Join the diverse Ikaaġvik Sikukun team as I share an overview of our research approach and preliminary results including observations of the sea ice heat budget that undergoes a rapid change during Spring melt and breakup, as well as the profound impact of sea ice change on the traditional use of these regions by local indigenous Iñupiaq populations.

Team: Andrew R. Mahoney, Sarah Betcher, Donna Hauser, Ajit Subramaniam, Alex Whiting, John Goodwin, Cyrus Harris, Robert Schaeffer, Ross Schaeffer, Nathan Laxague, Jessica Lindsay, Carson Witte

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Thu 23 Jul 11:00: Ice melt driven by the ocean - Two process studies on the physics of ice-ocean interactions based on observations from NE Greenland and the central Arctic Ocean The talk will be online. Contact the host to get Zoom details.

Wed, 08/07/2020 - 08:27
Ice melt driven by the ocean - Two process studies on the physics of ice-ocean interactions based on observations from NE Greenland and the central Arctic Ocean

Part I: Rapid supply of warm Atlantic waters below Greenland’s largest glacier tongue

Mass loss from the Greenland ice sheet has increased over the past two decades, currently accounting for 25% of global sea level rise. This is due to increased surface melt driven by atmospheric warming and the retreat and acceleration of marine terminating glaciers forced by oceanic heat transport. We use ship-based profiles, bathymetric data and moored time series from 2016 to 2017 of temperature, salinity and water velocity collected in front of the floating tongue of the 79 North Glacier in Northeast Greenland. These observations indicate that a year-round bottom-intensified inflow of warm Atlantic Water through a narrow channel is constrained by a sill. The associated heat transport leads to a mean melt rate of 10.4 ± 3.1 m yr–1 on the bottom of the floating glacier tongue. We conclude that near-glacier, sill-controlled ocean heat transport plays a crucial role for glacier stability.

Part II: Trapped in the Arctic ice – First results from the MOS AiC expedition (leg 3)

MOS AiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) aims at a breakthrough in understanding the Arctic climate system and in its representation in global climate models. The backbone of MOS AiC is the year-round operation of RV Polarstern, drifting since October 2019 with the sea ice across the central Arctic. A distributed regional network of observational sites has been set up on the sea ice in an area of up to ~40 km distance from RV Polarstern. Team OCEAN aims at a better understanding of ocean boundary-layer mixing processes and heat fluxes from the warm Atlantic water across the halocline. On leg 3, all teams carried out measurements during the transition from 24-hours darkness to 24-hours light. Furthermore, we sampled in newly formed leads and ridges, during the passage of storms, and captured the onset of the melting season – under challenging work conditions.

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