Photosynthetic light requirement near the theoretical minimum detected in Arctic microalgae

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Сен. 4, 2024

Язык: Английский

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Nansen and Amundsen basins: Gradients of physico-chemical properties and biota composition with implications for future resource management of the central Arctic Ocean

Elementa Science of the Anthropocene, Год журнала: 2025, Номер 13(1)

Опубликована: Янв. 1, 2025

The projected transition of the central Arctic Ocean (CAO) into a warmer, seasonally ice-free ocean requires more knowledge this environment to predict changes in structure and dynamics its ecosystems. We aimed compare state underlying processes Nansen Basin Amundsen ecosystems observed August–September 2021 assess impacts Atlantic Water inflow fresher Transpolar Drift waters, respectively, on these basins differed features sea ice, hydrography, chemical biological compositions. near-slope open water western showed clear fingerprint warm, saline Water, with larger vertical turbulent fluxes facilitating nutrient transport across pycnocline supporting standing stocks bacteria, protists, zooplankton. Pelagic primary production microbial faunal decreased northward Basin, likely due lower concentrations, stronger stratification, reduced light through continuous thicker ice snow cover possibly also impacted by declining levels. signals included salinity, higher silicate concentrations surface waters. Similarities earlier observations increase small-sized algae from overall low abundances CAO, suggesting that overarching patterns remained unchanged over past decades. Examples species range extensions notable taxon absences relative studies, however, could be borealization sea-ice conditions, respectively. Higher density ecosystem sampling consistent time series are recommended confirm such conclusions. distinct basin differences call for regional approach future management CAO. especially caution against using area strong southern as representative entire basin, let alone or

Язык: Английский

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Dynamic ice–ocean pathways along the Transpolar Drift amplify the dispersal of Siberian matter

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 14, 2025

Abstract The Transpolar Drift (TPD) plays a crucial role in regulating Arctic climate and ecosystems by transporting fresh water key substances, such as terrestrial nutrients pollutants, from the Siberian Shelf across Ocean to North Atlantic. However, year-round observations of TPD remain scarce, creating significant knowledge gaps regarding influence sea ice drift ocean surface circulation on transport pathways associated matter. Using geochemical provenance tracer data collected over complete seasonal cycle, our study reveals substantial spatiotemporal variability dispersal matter along TPD. This reflects dynamic shifts contributions individual rivers they integrate into large-scale current system, followed their rapid extensive redistribution through combination ice–ocean exchanges divergent drift. These findings emphasize complexity highlight challenges forecasting dynamics light anticipated changes extent, river discharge, patterns.

Язык: Английский

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Seasonal vertical migration of large polar copepods reinterpreted as a dispersal mechanism throughout the water column

Communications Earth & Environment, Год журнала: 2025, Номер 6(1)

Опубликована: Июнь 4, 2025

Язык: Английский

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Under-ice environment observations from a remotely operated vehicle during the MOSAiC expedition

Scientific Data, Год журнала: 2025, Номер 12(1)

Опубликована: Июнь 5, 2025

Язык: Английский

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