factors to explore the ecological role of marine mammals in the Arctic Ocean. Data stem from the interdisciplinary Arctic FRAM ocean observatory, which provides a unique opportunity to gain insight into [...] . I strongly believe that a holistic understanding of the Arctic Ocean ecosystem is essential in view of future management and conservation strategies to preserve this unique and fragile ecosystem [...] the acoustic occurrence of baleen whales in the Arctic Ocean. This region is of special concern due to strong ongoing environmental alterations triggered by climate change, such as sea-ice

marine biogeochemical model REcoM. When embedded into a large-scale ocean circulation model, we can project the future of the oceanic carbon sink, the conditions for marine life, and put a specific focus [...] preserved in biological archives such as foraminiferal shells or Arctic coralline algae, the group works to recover information about past ocean and climate conditions. In close collaboration with [...] Bio, Geo and Climate. Phytoplankton Ecophysiology Proxy Research Ocean Biogeochemical Modelling

fast things changed, what forces drove them, how ice sheets and oceans responded – we would gain something invaluable: a longer perspective on what is possible. But how do we read a past that left no [...] – a measure of ocean acidity that is closely linked to atmospheric CO₂ levels. These are just two of the signals we work with, each opening a different [...] water masses from the Atlantic are pushing further north into the Arctic Ocean through the Fram Strait. This is a recent and ongoing phenomenon, and understanding its pace and extent requires archives with

biological carbon pump) are linked in the present-day and future Arctic ocean, as well as to which extent this relationship is driven by differences between functional groups (i.e. species shifts) and [...] carbonate chemistry parameters in the Fram Strait and the Central Arctic Ocean. To monitor such parameters in the ocean, it is common practice to analyze discrete water samples obtained e.g. by rosette [...] sensors are designed and calibrated to perform in temperate oceans and thus, the Arctic represents a challenging environment that lies outside the configuaration of most sensors. Hence, in order to

to various factors such as warming, nutrient deficiency or ocean acidification, by focusing on one of the most sensitive areas on Earth, the subarctic and Arctic Ocean. Thereby, we contribute to [...] emission scenarios. Firstly, as a greenhouse gas, rising CO 2 causes ocean warming: temperatures of the surface waters have already increased by 1.1°C on average, while some regions like the Arctic Ocean [...] from CO 2 : As much of the anthropogenic CO 2 is taken up by the ocean, concentrations of CO2 and bicarbonate increase while the concentration of carbonate ions and the pH decrease, also known as 'Ocean

exposure will be studied in East Siberia along a transect from the Arctic Ocean to the Lake Baikal. The objectives of the project are to: (i) Reconstruct (a) mean interglacial temperatures at the southern [...] Meyer Funding: Leverhulme Grant Changes of water isotopes in Arctic Sea ice, Ocean, and atMosphere (CiASOM) (2021-2024) The main goal of the Changes of water isotopes in Arctic Sea ice, Ocean, and [...] is to provide a comprehensive description of the present-day Arctic water cycle and related key exchange processes between the atmosphere, ocean, and sea ice, using both instrumental data and climate

permafrost region remote sensing applications Remote sensing of Arctic Ocean Color Upscaling of permafrost region field measurements with remote sensing Generating permafrost remote sensing datasets

on polar and global climate change. Future climate change in the Arctic and Antarctic depends on feedbacks governed by small-scale processes: How do the surface fluxes of heat, moisture, momentum and [...] atmosphere becomes less stable, and as sea ice gives way to open ocean? How do clouds and precipitation change in response to changes in temperature, moisture, circulation and in the availability of

atmospheric processes and their interactions with sea ice and ocean in the global context. We combine long term observations from ground stations and innovative measurements from airborne platforms [...] processes in regional to global scale climate models. We run the Arctic research station AWIPEV on Svalbard and the meteorological and atmospheric observatory at the Antarctic research station Neumayer

we determine the δ 18 O values in ice and water samples from the Arctic and Antarctic, as well as the δ 13 C values of dissolved inorganic carbon in the water of the polar oceans. In addition, our [...] δ 18 O (seawater) Capturing modern hydrological processes in the ocean (T,S, stratification); T-S-signatures of different water masses MAT253 + EA IsoLink CN (is in acquisition; available from autumn [...] the supply of nutrient silicon and its use in polar and subpolar ocean regions (e.g. Southern Ocean, North Pacific) can be reconstructed on geological time scales. For the measurements, pure diatom-,