The impact of ocean currents and river temperatures on Arctic sea ice

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Global warming plays a central role in the decline of Arctic sea ice, but mechanisms remain debated. This study investigates relationship between Sea Ice Area (SIA) and Surface Temperature (SST) Ocean, analyzing satellite remote sensing data from 1982 to 2023. Results indicate that SST is primary factor contributing reduction SIA, with additional influences Pacific Atlantic water inflows, as well riverine discharges, which elevate further drive SIA. Lagged correlation analysis reveals changes precede SIA by approximately 13 days, supporting hypothesis rising SSTs ice melt. elucidates impact ocean currents freshwater influxes on dynamics, understand direct cause decline.

Язык: Английский

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Environmental Gradients, Not Geographic Boundaries, Structure Meiofaunal Communities in Siberian Seas

Environmental DNA, Год журнала: 2025, Номер 7(3)

Опубликована: Май 1, 2025

ABSTRACT Meiofauna (all invertebrates smaller than 1 mm) are not only sensitive to environmental changes but also contribute significantly nutrient cycling and energy transfer higher trophic levels. Despite their importance, meiofauna distribution ecology in the Siberian seas remain understudied. Here, we employ sediment DNA metabarcoding characterize diversity across unexplored seas. We show that community structure is primarily driven by river discharge coastal erosion, which heavily influenced climate change, rather geographical distinctions between observed nearshore areas where plumes promoted colonizer nematode communities resilient disturbances. Yet, dominance may lead decreased ecosystem stability future. This study provides a valuable baseline for remote undergoing rapid will be useful assessing future direction pace of benthic ecological trajectories.

Язык: Английский

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Origin of the Freshwater Component in Estuaries of the Ob and Yenisey Rivers and Adjacent Waters of the Kara Sea Based on Isotopic (δD, δ18O) Data

Oceanology, Год журнала: 2025, Номер 65(1), С. 56 - 66

Опубликована: Фев. 1, 2025

Язык: Английский

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The Role of the St. Anna Trough in Atlantic Water Transport Into the Arctic Ocean: A Novel Radiogenic Isotope Assessment Using Iodine, Uranium, and Neodymium

Journal of Geophysical Research Oceans, Год журнала: 2025, Номер 130(4)

Опубликована: Апрель 1, 2025

Abstract The St. Anna Trough (SAT) plays a critical role in Arctic Ocean circulation by facilitating heat and water mass exchange, influencing sea‐ice melt thermohaline dynamics. However, ocean this key region remains understudied compared to other parts of the Arctic. To better understand pathways, origins, mixing processes SAT, study analyzes anthropogenic radionuclides iodine‐129 ( 129 I) uranium‐236 236 U), alongside neodymium isotopes (εNd). Seawater samples were primarily collected from SAT Kara Sea during 2021 Century Expedition, with complementary data sets independent sampling campaigns Fram Strait (2021) Barents (2018) providing broader regional context. Distinct I signatures reveal Atlantic Waters shelf‐formed waters, contributing formation Cold Deep Water, which integrates into intermediate deep Ocean. Elevated U concentrations mid‐depth indicate intrusion Arctic‐Atlantic underscoring region's recirculation complexity. εNd strong riverine signal Ob Yenisei rivers southern Voronin Trough, whereas surface waters show greater influence Waters. radionuclide above highlight area as primary gateway for entering central These findings provide new insights demonstrate strengths resolving transformations pathways.

Язык: Английский

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Sea ice decline in the Eastern Arctic results in expansion of the freshened surface layer

Frontiers in Marine Science, Год журнала: 2025, Номер 12

Опубликована: Май 19, 2025

In this study, we report an anomalously large freshened surface layer in the Eastern Arctic during ice-free season 2019. This is formed by river discharge and sea ice meltwater also referred to as Lena plume, due River its major freshwater source. Based on situ satellite data, demonstrate that August-September 2019 plume extended from Delta west Wrangel Island east, i.e., zonal extent was approximately 2000 km. The area of varied between 750 000 870 km 2 period, which 1.5 times greater than assessment maximal previous years, albeit they were often hindered presence coverage. main reasons for anomalous spreading are following. First, intense melting provided a significantly volume inflow layer, compared other years. Second, cleared out Laptev East Siberian seas beginning August September respectively, these remained free 3 months (longer period occurred only 2007 2020). Three favorable wind forcing July-September caused extensive eastward northward expansion, together with changes vertical structure plume. expansion affected composition phytoplankton communities, intrusion species eastern part Sea. reported under conditions provides baseline forecasting future state large-scale cycle Ocean, expectedly reduced cover.

Язык: Английский

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Photoautotrophic picoplankton of the Kara Sea in the middle of summer: effect of first-year ice retreat on carbon and chlorophyll biomass and primary production

Marine Environmental Research, Год журнала: 2024, Номер 202, С. 106809 - 106809

Опубликована: Окт. 23, 2024

Язык: Английский

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