A world of sea ice and snow 16. September 2025 Beautiful sunshine, a dreamlike scenery with the mountains of Greenland in the background and a snow-covered floe of sea ice. This is what our first ice station [...] like (see photo). This marked the start of our work on analyzing snow and sea ice. We want to know the properties snow and sea ice have and study what lives in and underneath it. To do this, we go onto [...] snow. New thin, still grey sea ice is forming all around. We are now processing our samples and are already looking forward to the next ice drift. Until then, for many of us the sea ice is mainly an obstacle

Impact of sea ice decline and changing silicic acid availability on Central Arctic primary productivity Antonia Thielecke1, Jeffrey Krause2, Natasha Bryan1, Lena Eggers1, Mar Fernández-Méndez1 1Alfred [...] 1Alfred Wegener Institute, Germany; 2Dauphin Island Sea Lab, USA Antonia.thielecke@awi.de References 1 Hátún, H., Azetsu-Scott, K., Somavilla, R., Rey, F., Johnson, C., Mathis, M., Mikolajewicz, U., Coupel, P [...] S.V., Salter, I., Ólafsson, J., 2017. The subpolar gyre regulates silicate concentrations in the North Atlantic. Sci Rep 7, 14576. doi.org/10.1038/s41598-017-14837-4 2 Orkney, A., Platt, T., N

and nutrient supply shape primary producers and stoichiometry in the Humboldt upwelling system Deep Sea Research Part II: Topical Studies in Oceanography 2025-09 | Journal article DOI: 10.1016/j.dsr2.2025 [...] Methylphosphonate-driven methane formation and its link to primary production in the oligotrophic North Atlantic - N. von Arx, J. - 2023- Nature Communications 2022 Mar Fernández-Méndez (0000-0002-4968-1156)

Investigators Group “Southern Ocean & Antarctic Sea ice Evolution (SO-ASE)” is looking into the unexpected changes that have been seen in Antarctic sea ice over the last few decades and the need to reduce [...] Ecosystem – is to assess the consequences of the decline in silicic acid concentration in the inflow of North Atlantic water into the Eurasian Arctic for the Arctic marine ecosystem using an ecosystem biology [...] climate change Link to project webpage ARJEL To better understand the role of jellyfish in Arctic seas, the Helmholtz Young Investigators Group ARJEL (ARctic JELlifish) will combine the latest technologies

designs will then be implemented in large-scale field trials, with floating cages deployed in the North Sea and fixed barriers in Gran Canaria. Across both sites, we will monitor biomass production, carbon [...] Jan Jacob, M.Sc. PhD Canditate Jan Jacob (Photo: Jan Jacob) Dissertation Title: FROM LAB TO SEA: Exploring Ulva Reproduction and Growth-Dynamics for Open-Water Aquaculture on Gran Canaria Master Thesis

biodegradable floating meshes, and automated seeding—the project aims to upscale Ulva production in the North Sea and Gran Canaria. These techniques support a circular blue bioeconomy by transforming harvested

expedition (Polarstern expedition 150). With calm weather and smooth seas, the ship glided west through Isfjorden before turning north along the rugged coastline of Svalbard. This voyage carries an important [...] disappear into the depths, hauled moorings from the seabed back onto the deck, lowered bongo nets into the sea. And yet, with every new expedition, there is a fresh spark of magic. The first CTD cast, the first [...] exchanges in the labs, laughter in the corridors. Today, at 81°N and 3°E, we reached the edge of the sea ice, veiled in a soft layer of fog. Seabirds wheeled around the ship as if to greet us, a reminder

hydrography of the North Atlantic, in particular by analyzing the impact of oceanic resolution in key regions, such as the Gulf Stream and North Atlantic Current regions, the Labrador Sea, and the Denmark [...] Goessling | Özgür Gürses | Thomas Rackow | Dmitry Sidorenko SPP 1889 Regional Sea Level Change and Society Understanding regional sea level change and its impacts on societies requires new forms of integrated [...] research between natural and social sciences. The Priority Program (SPP-1889) "Regional Sea Level Change and Society (SeaLevel)" , funded by the German Research Foundation (Deutsche Forschungsgemeinschaft,

Extreme sea surface temperatures in 2023 resulted in high CO₂ outgassing, particularly in the North Atlantic, meaning that the global ocean absorbed less CO₂ overall. Thanks to El Niño, much less CO₂ than [...] than usual escaped into the atmosphere in the eastern Pacific, but the outgassing in the North Atlantic negated the positive effect. The fact that the ocean did not lose even more CO₂ is due to physical

wetting/drying option. Recent applications • Tidally induced transport and Lagrangian tracking in the North Sea Fig. Clouds of the tracers, resulting from backtracking for 3 weeks superimposed on a bathymetry [...] V. Sidorenko, A. Androsov, K. H. Wiltshire • Sylt-Rømø Bight under sea level rise pressure Fig. Change in the tidal zone, various sea level rise scenarios. Authors: G.Konyssova, V. Sidorneko, A. Androsov [...] Androsov, S. Rubinetti, L.Sander, K.H.Wiltshire • Venice lagoon, sea level rise and Acqua alta events Animation. Modeled Acqua alta events in the Venice lagoon. Authors: S. Rubinetti, I. Kuznetsov, V. Sidorenko