Snow Loss Into Leads in Arctic Sea Ice: Minimal in Typical Wintertime Conditions, but High During a Warm and Windy Snowfall Event DOI Creative Commons
David Clemens, Chris Polashenski, M. M. Frey

и другие.

Geophysical Research Letters, Год журнала: 2023, Номер 50(12)

Опубликована: Июнь 23, 2023

Abstract The amount of snow on Arctic sea ice impacts the mass budget. Wind redistribution into open water in leads is hypothesized to cause significant wintertime loss. However, there are no direct measurements loss leads. We measured lost four Central winter 2020. find, contrary expectations, that under typical conditions, minimal was during a cyclone delivered warm air temperatures, high winds, and snowfall, 35.0 ± 1.1 cm equivalent (SWE) lead (per unit area). This corresponded removal 0.7–1.1 SWE from entire surface—∼6%–10% this site's annual precipitation. Warm which increase length time remain unfrozen, may be an underappreciated factor

Язык: Английский

Nansen and Amundsen basins: Gradients of physico-chemical properties and biota composition with implications for future resource management of the central Arctic Ocean DOI Creative Commons
Doreen Kohlbach, Agneta Fransson,

Martí Amargant-Arumí

и другие.

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

Процитировано

0

Data on Physical Properties of Sea Ice in the Northern Barents Sea and Adjacent Arctic Basin From the Nansen Legacy Project DOI Creative Commons
Dmitry Divine, Adam Steer, Mats A. Granskog

и другие.

Geoscience Data Journal, Год журнала: 2025, Номер 12(2)

Опубликована: Март 17, 2025

ABSTRACT Recent decline of sea ice in the Barents Sea represents a clear manifestation ongoing Arctic warming. This study presents compilation data sets on physics acquired during 2018–2022 Nansen Legacy—a Norwegian multidisciplinary national research programme that focused northern Sea. The were using variety methods such as coring, thickness drillings, snow pits, depth surveys, drone flights, on‐ice and helicopter‐borne electromagnetic measurements thickness, draft by bottom‐anchored moorings. collected cover several key physical parameters describing encompass range spatial (local to regional) temporal (daily annual) scales. These aid filling substantial knowledge gap recent conditions rapidly changing region.

Язык: Английский

Процитировано

0

Characteristics and effects of aerosols during blowing snow events in the central Arctic DOI Creative Commons
Nora Bergner, Benjamin Heutte, Ivo Beck

и другие.

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

Опубликована: Янв. 1, 2025

Sea salt aerosol (SSaer) significantly impacts aerosol-radiation and aerosol-cloud interactions, sublimated blowing snow is hypothesized to be an important SSaer source in polar regions. Understanding other wind-sourced aerosols’ climate relevant properties needed, especially during winter when Arctic amplification greatest. However, most of our understanding comes from modeling studies, direct observations are sparse. Additionally, can originate multiple sources, making it difficult disentangle emission processes. Here, we present comprehensive events the Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition central Arctic. High wind speed strongly enhances total number, submicron sodium chloride mass, cloud condensation nuclei concentrations, scattering coefficients. Generally, relative response enhancement strongest fall concentrations lowest. Blowing showed similar environmental across events, apart occasions with high age (>6 days since last snowfall). Coarse-mode number (>1 μm) better explained by variability averaged over 12-h air mass back trajectories arriving at MOSAiC site compared local, instantaneous speed, suggesting importance regional transport consideration history wind-driven production. These provide new insights into may help validate studies improve model parameterizations particularly indirect radiative forcing.

Язык: Английский

Процитировано

0

Predicting Melt Pond Coverage on Arctic Sea Ice From Pre‐Melt Surface Topography DOI Creative Commons
Niels Fuchs, Gerit Birnbaum, Niklas Neckel

и другие.

Geophysical Research Letters, Год журнала: 2025, Номер 52(9)

Опубликована: Май 8, 2025

Abstract Sea‐ice melt ponds form in the depressions of pre‐melt surface topography, a process widely accepted yet lacking larger‐scale evaluation through explicit comparisons. During MOSAiC, we collected multi‐dimensional aerial data to examine relationship between topography and pond evolution across an entire Arctic ice floe. Using hydrological models, analyze correlation potential meltwater accumulation areas identified winter spring topographies, available meltwater, observed coverage. Our findings demonstrate strong connection, revealing 72% accuracy matching low ponds, with 98% basins deeper than 0.5 m transforming into ponds. Incorporating assumptions regarding availability improve predictions fraction highlight key factors driving extensive lateral runoff networks on No significant differences are first‐ second‐year ice. This study provides valuable ground truth for future modeling measurements formation.

Язык: Английский

Процитировано

0

Snow Loss Into Leads in Arctic Sea Ice: Minimal in Typical Wintertime Conditions, but High During a Warm and Windy Snowfall Event DOI Creative Commons
David Clemens, Chris Polashenski, M. M. Frey

и другие.

Geophysical Research Letters, Год журнала: 2023, Номер 50(12)

Опубликована: Июнь 23, 2023

Abstract The amount of snow on Arctic sea ice impacts the mass budget. Wind redistribution into open water in leads is hypothesized to cause significant wintertime loss. However, there are no direct measurements loss leads. We measured lost four Central winter 2020. find, contrary expectations, that under typical conditions, minimal was during a cyclone delivered warm air temperatures, high winds, and snowfall, 35.0 ± 1.1 cm equivalent (SWE) lead (per unit area). This corresponded removal 0.7–1.1 SWE from entire surface—∼6%–10% this site's annual precipitation. Warm which increase length time remain unfrozen, may be an underappreciated factor

Язык: Английский

Процитировано

8