09:30-10:00 Keynote Talk 1: Physical Drivers in the Changing Arctic Ocean – the Larger Perspective Igor V. Polyakov (University of Alaska, Fairbanks, USA)
10:00-10:30 Keynote Talk 2: Primary Production and the Shifting Foundations of a Changing Arctic Ocean Karley Campbell (University of Tromsø The Arctic University of Norway, Norway)
11:00-11:15 Plenary Talk 1: Strong Seasonality and Advection Shape the Zooplankton Community in the European Arctic Janne Søreide (University Centre of Svalbard, Norway)
11:30-11:45 Plenary Talk 3: Biogeochemistry of the Holocene Sediments in the Barents Sea, and What it Might Mean for Paleoceanography Christian März (University of Bonn, Germany)
11:45-12:00 Plenary Talk 4 Science for use talk Seasonal and Climate Change Effects on Pollution Accumulation and Effects in the Arctic Marine Food Web Katrine Borgå (University in Oslo, Norway)
All Nansen Legacy researchers still actively involved in the project should purchase their travel as they have done previously (follow guidelines at their own institution) and apply for travel reimbursements by their respective partner institutions. The institutions will then send a compiled claim to the project office.
For symposium registration, the project administration will soon send you a booking code by email that will allow you to register for the symposium and book the hotel room through the registration system. Accommodation costs and the participant fee will directly be covered by the Nansen Legacy.
Plenary Talk 4
Tuesday, 7 November 2023 11:45-12:00
- Science for use talk -
Seasonal and climate change effects on pollution accumulation and effects in the Arctic marine food web
Katrine Borgå (University of Oslo, Norway)
(Abstract to be announced soon)
Plenary Talk 3
Tuesday, 7 November 2023 11:30-11:45
Biogeochemistry of the Holocene sediments in the Barents Sea, and what it might mean for paleoceanography
Christian März (University of Bonn, Germany)
Marine sediments are excellent recorders of past environmental conditions – but they are also biogeochemical reactors. This “duality” presents a challenge for paleo-environmental reconstructions: On the one hand, certain sediments are more prone to diagenetic overprint than others – on the other hand, certain depositional conditions give rise to more intense diagenetic reactions. Within the NERC-funded project ChAOS (The Changing Arctic Ocean Seafloor), and in collaboration with the Nansen Legacy project, an interdisciplinary team of scientists studied the shallow seafloor of the Barents Sea to unravel the diagenetic processes occurring in these deposits, and to inform paleo-environmental reconstructions on sediment cores from this Arctic shelf region. In this talk, I will present an overview of our findings, focusing on factors that control the degradation/dissolution versus preservation of various sediment components, including organic matter, biogenic carbonate, biogenic opal and metals like iron and manganese.
Plenary Talk 2
Tuesday, 7 November 2023 11:15-11:30
Fishes in the Canadian Arctic, the Barents Sea, and beyond
Maxime Geoffroy (Memorial University of Newfoundland, Canada)
The Arctic is warming up to four times faster than the rest of our planet, resulting in a drastic reduction in sea ice cover and an increase in water temperatures. These changes strongly modify the habitat of the fish thriving under the extreme conditions prevailing in the Arctic and allow boreal species from the North Atlantic and Pacific to migrate further North, potentially opening new fishing grounds. However, these changes do not occur at the same rate across all Arctic regions. The Canadian Arctic remains mostly dominated by endemic species, while the Barents Sea experiences a rapid borealization of its fauna. Based on acoustic-trawl surveys conducted in both regions, this presentation will contrast the diversity and distribution of fish in the Canadian Arctic and the Barents Sea. It will further discuss current and future changes in their fish and fisheries ecosystems.
Plenary Talk 1
Tuesday, 7 November 2023 11:00-11:15
Strong seasonality and advection shape the zooplankton community in the European Arctic
Janne Søreide (University Centre in Svalbard, Norway)
One of the distinct features of the European Arctic is the massive influx of warm Atlantic water, carrying huge amounts of nutrients and boreal plankton north. The result is a diverse and rich zooplankton community in the Svalbard-Barents Sea region, where a dominance of North Atlantic species mirrors strong influence of Atlantic water. The continuous supply of boreal zooplankton exposes the European Arctic zooplankton community to a severe borealisation, also referred to as “Atlantification”. However, the long, dark winter combined with the short summer make it hard for most of these boreal species to survive and thrive and we observe a reset to a more Arctic zooplankton community over the course of the winter. With global warming, sea ice extent and thickness are reduced while the primary production season in the high Arctic is extending. Whether this will increase survival rate and reproductive success of boreal species in the European Arctic is one of the key questions that will be discussed in this talk.
Keynote Talk 2
Tuesday, 7 November 2023 10:00-10:30
Primary production and the shifting foundations of a changing Arctic Ocean
Karley Campbell (University of Tromsø The Arctic University of Norway, Norway)
Primary producers are the basis of ecosystems. Through their photosynthetic activity they provide the organic carbon necessary to support higher trophic levels while also influencing the movement of climate relevant gases like CO2 between the atmosphere and ocean. In the Arctic, sea ice is a prominent yet rapidly changing feature of the marine ecosystem that both hinders photosynthetic activity and provides new habitat opportunities. Here we review the current distribution of - and ongoing changes to - primary producers and their production in the Arctic Ocean. Important considerations for studying the production potential of sea ice are also investigated; including the need to represent a diversity of microhabitats within the ice and consider the role of respiration associated with them.
Keynote Talk 1
Tuesday, 7 November 2023 09:30-10:00
Physical drivers in the changing Arctic Ocean – the larger perspective
Igor V. Polyakov (University of Alaska, Fairbanks, USA)
High-latitude atlantification is caused by increased warm, salty sub-Arctic inflows, which affect oceanic stratification, increase heat fluxes, and decrease sea ice in the Eurasian Basin of the Arctic Ocean. These inflows from the North Atlantic across the Nordic Seas are modulated by the atmospheric Arctic Dipole (AD), linked with anticyclonic winds over North America and cyclonic winds over Eurasia. The alternating atmospheric AD regimes establish a "switchgear mechanism". Switchgear decreased northward inflows across Fram Strait and increased inflows throughout the Barents Sea between 2007 and 2021, which was connected with the positive AD regime. A stronger Arctic Ocean circulation and freshwater redistribution into the Amerasian Basin associated with increased stratification and decreased oceanic heat fluxes are other consequences of the positive AD regime. These processes contributed to a hiatus in Arctic sea-ice loss after 2007. A transition to a new negative AD regime will likely accelerate the Arctic sea-ice decline, with consequences for the Arctic climate system.
