Thin and transient meltwater layers and false bottoms in the Arctic sea ice pack—Recent insights on these historically overlooked features

Elementa Science of the Anthropocene, Год журнала: 2023, Номер 11(1)

Опубликована: Янв. 1, 2023

The rapid melt of snow and sea ice during the Arctic summer provides a significant source low-salinity meltwater to surface ocean on local scale. accumulation this on, under, around floes can result in relatively thin layers upper ocean. Due small-scale nature these upper-ocean features, typically order 1 m thick or less, they are rarely detected by standard methods, but nevertheless pervasive critically important summer. Observations Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition 2020 focused evolution such made advancements understanding their role coupled system. Here we provide review Arctic, with emphasis new findings from MOSAiC. Both prior recent observational datasets indicate an intermittent yet long-lasting (weeks months) layer 0.1 1.0 thickness, large spatial range. presence impacts physical system reducing bottom allowing formation via false growth. Collectively, bottoms reduce atmosphere-ocean exchanges momentum, energy, material. far-reaching, including acting as barrier nutrient gas exchange impacting ecosystem diversity productivity.

Язык: Английский

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The Eurasian Arctic Ocean along the MOSAiC drift in 2019–2020: An interdisciplinary perspective on physical properties and processes

Elementa Science of the Anthropocene, Год журнала: 2024, Номер 12(1)

Опубликована: Янв. 1, 2024

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019–2020), a year-long drift with sea ice, has provided scientific community an unprecedented, multidisciplinary dataset from Eurasian Ocean, covering high atmosphere to deep ocean across all seasons. However, heterogeneity data and superposition spatial temporal variability, intrinsic campaign, complicate interpretation observations. In this study, we have compiled quality-controlled physical hydrographic best spatio-temporal coverage derived core parameters, including mixed layer depth, heat fluxes over key layers, friction velocity. We provide comprehensive accessible overview conditions encountered along MOSAiC drift, discuss their interdisciplinary implications, compare common climatologies these new data. Our results indicate that, most part, variability was dominated by regional rather than seasonal signals, carrying potentially strong implications biogeochemistry, ecology, even atmospheric conditions. Near-surface properties were strongly influenced relative position sampling, within or outside river-water Transpolar Drift, warming meltwater input. Ventilation down Atlantic Water in Nansen Basin allowed stronger connectivity between subsurface ice surface via elevated upward fluxes. Yermak Plateau Fram Strait regions characterized heterogeneous water mass distributions, energetic currents, lateral gradients frontal regions. Together presented offer context research, fostering improved understanding complex, coupled System.

Язык: Английский

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The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes

EarthArXiv (California Digital Library), Год журнала: 2023, Номер unknown

Опубликована: Сен. 7, 2023

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019--2020), a year-long drift with sea ice, has provided scientific community an unprecedented, multidisciplinary dataset from Eurasian Ocean, covering high atmosphere to deep ocean across all seasons. However, heterogeneity data and superposition spatial temporal variability, intrinsic campaign, complicate interpretation observations. In this study, we have compiled quality-controlled physical hydrographic best spatio-temporal coverage derived core parameters, including mixed layer depth, heat fluxes over key layers, friction velocity. We provide comprehensive accessible overview conditions encountered along MOSAiC drift, discuss their interdisciplinary implications, compare common climatologies these new data. Our results indicate that, most part, variability was dominated by regional rather than seasonal signals, carrying potentially strong implications biogeochemistry, ecology, even atmospheric conditions. Near-surface properties were strongly influenced relative position sampling, within or outside river-water Transpolar Drift, warming meltwater input. Ventilation down Atlantic Water in Nansen Basin allowed stronger connectivity between subsurface ice surface via elevated upward fluxes. Yermak Plateau Fram Strait regions characterized heterogeneous water mass distributions, energetic currents, lateral gradients frontal regions. Together presented offer context research, fostering improved understanding complex, coupled System.

Язык: Английский

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Dependency of the drag coefficient on boundary layer stability beneath drifting sea ice in the central Arctic Ocean

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Июль 4, 2024

The ice-ocean drag coefficient

Язык: Английский

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Melt pond CO2 dynamics and fluxes with the atmosphere in the central Arctic Ocean during the summer-to-autumn transition

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

Опубликована: Янв. 1, 2025

Melt ponds are a common feature of the Arctic sea-ice environment during summer, and they play an important role in exchange heat water vapor between ocean atmosphere. We report results time-series study CO2 dynamics within melt (and nearby lead) related fluxes with atmosphere summer-to-autumn transition central Ocean Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. In late summer 2020, low-salinity meltwater was distributed throughout ponds, undersaturation pCO2 drove net influx from The layer subsequently thinned due to seawater influx, strong gradient salinity low-pCO2 observed at interface beginning September. Mixing underlying drives significant drawdown as result non-linearities carbonate chemistry. By middle September, stratification had dissipated. Subsequent freezing then began, cooling wind-induced ice floes caused mixing through bottom pond. pond reached 300 µatm exchanging seawater. However, gas impeded by formation impermeable freshwater on surface pond, flux nearly zero into which no longer sink atmospheric CO2. Overall, this area (both lead water) act moderate sinks

Язык: Английский

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Arctic marine environments regulated by ocean transport and air‒sea‒land interaction: Findings from the ArCS II Ocean Research Program

Polar Science, Год журнала: 2025, Номер unknown, С. 101205 - 101205

Опубликована: Апрель 1, 2025

Язык: Английский

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Multidisciplinary research for sea ice in Saroma-ko Lagoon, Hokkaido, Japan 2023（2023年北海道サロマ湖における学際的海氷研究について）

Bulletin of Glaciological Research, Год журнала: 2024, Номер 42(0), С. 19 - 37

Опубликована: Янв. 1, 2024

Язык: Английский

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Pacific Waters in the East Siberian Sea: Identification from δ13С(DIC) and [DIC] Characteristics

Doklady Earth Sciences, Год журнала: 2024, Номер 515(2), С. 715 - 721

Опубликована: Фев. 21, 2024

Язык: Английский

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Arctic Surface Snow Interactions with the Atmosphere: Spatio-Temporal Isotopic Variability During the MOSAiC Expedition

Опубликована: Март 20, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ18O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Язык: Английский

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Comment on egusphere-2024-719

Опубликована: Апрель 21, 2024

Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we identify clear layering within snowpack: top layer, with lower δ¹⁸O values higher d-excess values, indicates fresh meteoric snowfall, while bottom affected by ice beneath, shows d- d-excess values. integrating these discrete samples continuous vapour data, our research provides insight into as well that alter signatures snow. We observe significant difference vapor during autumn, mainly due delays sampling after precipitation events, ranges suggesting impact Atlantic moisture. Winter months exhibit sharp differences indicating kinetic fractionation amid extreme cold RV Polarstern traverses Siberian sector Ocean. Conversely, summer display convergence signatures, reflecting conditions favouring equilibrium fractionation, highlighted increased air temperatures humidity levels. While readily responds temperature humidity, surface influenced more subsequent such sublimation wind-driven redistribution. Sublimation, intensified snow’s prolonged residence facilitated porosity snow, plays key role enrichment. Wind-driven redistribution, occurring 67 % winter, led homogenised depleted signal across spreading effect was especially pronounced ridge profiles, where layers showed uniform signal, stark contrast flat samples. Furthermore, distinct patterns were detected along MOSAiC route region close Samoylov Island Fram Straight near Ny-Ålesund. Snow exhibited notable seasonal variations, which indicative continental climate. In contrast, Ny-Ålesund displayed consistent fluctuations, steady

Язык: Английский

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