A5059641405- Arctic and Antarctic ice dynamics
- Calibration and Measurement Techniques
- Methane Hydrates and Related Phenomena
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Climate change and permafrost
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Solar Radiation and Photovoltaics
- Arctic and Russian Policy Studies
- Marine animal studies overview
- Winter Sports Injuries and Performance
- Food Industry and Aquatic Biology
- Oceanographic and Atmospheric Processes
- Atmospheric chemistry and aerosols
- Marine and coastal ecosystems
- Infrared Target Detection Methodologies
- Marine Bivalve and Aquaculture Studies
- Marine Biology and Ecology Research
- Indigenous Studies and Ecology
- Ocean Acidification Effects and Responses
- Smart Materials for Construction
- Seismic Waves and Analysis
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2019-2024
Norwegian Geotechnical Institute
2023
Norwegian University of Science and Technology
2023
Bjerknes Centre for Climate Research
2019
University of Bergen
2019
Year-round observations of the physical snow and ice properties processes that govern pack evolution its interaction with atmosphere ocean were conducted during Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) expedition research vessel Polarstern in Ocean from October 2019 to September 2020. This work was embedded into interdisciplinary design 5 MOSAiC teams, studying atmosphere, sea ice, ocean, ecosystem, biogeochemical processes. The overall aim characterize cover...
The magnitude, spectral composition, and variability of the Arctic sea ice surface albedo are key to understanding numerically simulating Earth’s shortwave energy budget. Spectral broadband albedos were spatially temporally sampled by on-ice observers along individual survey lines throughout sunlit season (April–September, 2020) during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. seasonal evolution MOSAiC year was constructed from averaged values each line....
Abstract. Arctic sea ice has undergone significant changes over the past 50 years. Modern large-scale estimates of thickness and volume come from satellite observations. However, these have limited accuracy, especially during melt season, making it difficult to compare state year year. Uncertainties in density lead high uncertainties retrieval its freeboard. During Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition, we observed a first-year (FYI) freeboard increase...
Abstract The formation of platelet ice is well known to occur under Antarctic sea ice, where subice layers form from supercooled shelf water. In the Arctic, however, has not been extensively observed, and its morphology currently remain enigmatic. Here, we present first comprehensive, long‐term in situ observations a decimeter thick layer free‐drifting pack Central Arctic winter. Observations carried out with remotely operated underwater vehicle (ROV) during midwinter leg MOSAiC drift...
Abstract. Sea-ice ridges constitute a large fraction of the total Arctic sea-ice area (up to 40 %–50 %); nevertheless, they are least studied part ice pack. Here we investigate melt rates using rare, repeated underwater multibeam sonar surveys that cover period 1 month during advanced stage melt. Bottom increases with draft for first- and second-year level first-year ridge, an average 0.46, 0.55, 0.95 m snow in observation period, respectively. On average, ridge had 4.6 keel bottom draft,...
The reflection, absorption, and transmittance of shortwave solar radiation by sea ice play crucial roles in physical biological processes the ice-covered Arctic Ocean atmosphere. These sea-ice optical properties, particularly during melt season, significantly impact energy fluxes within total budget coupled atmosphere-ice-ocean system. We analyzed data from autonomous drifting stations to investigate seasonal evolution spectral albedo, transmittance, absorptivity for different sea-ice, snow,...
Abstract During the 2018 Multidisciplinary Arctic Program‐Last Ice in Lincoln Sea, we sampled 45 multiyear ice (MYI) and 34 first‐year (FYI) cores, combined with snow depth, thickness, transmittance surveys from adjacent level FYI undeformed MYI. sites show a decoupling between bottom‐ice chlorophyll (chl a) depth; however, MYI showed significant correlation ice‐algal chl biomass depth. Topographic control of cover resulted greater spatiotemporal variability over FYI, consequently...
Sea ice continues to decline across many regions of the Arctic, with remaining becoming increasingly younger and more dynamic. These changes alter habitats microbial life that live within sea ice, which support healthy functioning marine ecosystem provision resources for human-consumption, in addition influencing biogeochemical cycles (e.g. air-sea CO2 exchange). With susceptibility ecosystems climate change, there is a pressing need fill knowledge gaps surrounding their communities. Of...
The reflection, absorption, and transmittance of solar (shortwave) radiation by sea ice play a crucial role in physical biological processes the ice-covered Arctic Ocean atmosphere. These optical properties are great importance, particular during melt season, as they significantly impact energy fluxes within total budget coupled atmosphere-ice-ocean system. In this paper, we analyse data from autonomous drifting stations to investigate seasonal evolution spectral albedo, absorptivity for...
Abstract. Uncertainties in sea-ice density lead to high uncertainties ice thickness retrieval from its freeboard. During the MOSAiC expedition, we observed first-year (FYI) freeboard increase by 0.02 m while decreased 0.5 during Arctic melt season June–July 2020. Over same period, FYI 910 kg m-3 880 m-3, and air fraction increased 1 % 6 %, due voids expansion controlled internal melt. This volume substantially affected Due differences thermodynamic state (such as salinity temperature), is...
Microalgae are the main source of omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic (DHA), essential for healthy development most marine terrestrial fauna including humans. Inverse correlations algal EPA DHA proportions (% total acids) with temperature have led to suggestions a warming-induced decline in global production these biomolecules an enhanced importance high latitude organisms their provision. The cold Arctic Ocean is potential hotspot production, but consequences...
Abstract Melt ponds have a strong impact on the Arctic surface energy balance and ice‐associated ecosystem because they transmit more solar radiation compared to bare ice. In existing literature, melt are considered as bright windows ocean, even during freeze‐up in autumn. central summer‐autumn transition 2018, we encountered situation where snow accumulated refrozen adjacent ice, leading reduction light transmittance of below that Results from radiative transfer model support this finding....
The net productivity of sea ice is determined by the physical and geochemical characteristics ice–ocean system activity organisms inhabiting ice. Differences in habitat suitability between first-year multi-year can affect algal community composition acclimation state, introducing considerable variability to primary production within each type. In this study, we characterized biogeochemical adjacent floes Lincoln Sea Canadian High Arctic, during May 2018 Multidisciplinary Arctic Program—Last...
The impact of a rapidly shifting sea-ice cover on climate, ecosystem processes and biophysical habitat properties is not yet fully understood, particularly in the central Arctic Ocean, due to lack spatially representative observations. From June July 2020 during year-long Multidisciplinary drifting Observatory for Study Climate (MOSAiC, leg 4) Transpolar Drift we deployed an underwater hyperspectral imager (UHI) mounted remotely operated vehicle (ROV) characterize different habitats. We...
Abstracts We present light measurements in Arctic sea ice obtained during the year-long MOSAiC drift through central Ocean 2019–2020. Such are important as plays a fundamental role climate and ecosystem. The partitioning of solar irradiance determines availability radiation energy for thermodynamic processes primary productivity. However, observations along vertical path rare. data we were collected by two measurement systems, lightharp lightchain, both measuring autonomously multi-spectral...
Abstract As the annual expanse of Arctic summer ice‐cover steadily decreases, concomitant biogeochemical and ecological changes in this region are likely to occur. Because Central Ocean is often nutrient light limited, it essential understand how environmental will affect productivity, phytoplankton species composition, ensuing biogeochemistry region. During transition from late early autumn, water column sampling various parameters was conducted along an ice‐floe drift station near North...
Radiation transmitted through sea ice and snow has an important impact on the energy partitioning at atmosphere-ice-ocean interface. Snow depth thickness are crucial in determining its temporal spatial variations. Under-ice surveys using autonomous robotic vehicles to measure radiation often lack coincident measurements so that direct relationships cannot be investigated. imprint distinct features spectral shape of radiation. Here, we use those retrieve depth. Transmitted radiance was...
A trend towards earlier sea-ice melt is detected in many ice-covered regions the Arctic. The timing of onset has a strong impact on energy budget. Melt changes radiative properties ice due to increasing snow wetness and meltwater. So far, satellite passive microwave data are used detect onset. We analyzed transmitted radiation spectra as collected underneath drifting using remotely operated vehicle during ARTofMELT expedition Fram Strait spring 2023. colocated those with measurements depth,...
<p>During the melt season, sea ice melts from surface and bottom. The rates substantially vary for ridges undeformed first- second-year ice. Ridges generally faster than ice, while of ridge keels is often accompanied by further summer growth their consolidated layer. This consolidation related to refreezing less saline meltwater, originating snowmelt keel melt. We examine spatial variability different types <em>in situ</em> drilling, coring,...
Abstract. The Nioghalvfjerdsbræ (79NG) is a floating ice tongue on Northeast Greenland draining large part of the Ice Sheet. A CTD profile from rift close to northern front shows that Atlantic Water (AW) present in cavity below, with maximum temperature approximately 1 °C at 610 m depth. AW thus has potential drive submarine melting along base. Here, we simulate melt rates 79NG 1D numerical Shelf (ISW) plume model. meltwater initiated grounding line depth (600 m) and rises base as result...
Sea-ice ridges constitute a large fraction of the total Arctic sea-ice volume (up to 40%); nevertheless, they are least studied part ice pack. Here we investigate melt rates using rare underwater multibeam data that cover period one month during advanced stage in summer. We show degree bottom increases with draft for first-year and second-year level ice, ridge keel, an average 0.45 m, 0.55 0.95 m snow observation period, respectively. While keels 3-4 times higher than surface almost...
Abstract. Sea-ice ridges constitute a large fraction of the total Arctic sea-ice area (up to 40–50 %); nevertheless, they are least studied part ice pack. Here we investigate melt rates using rare repeated underwater multibeam sonar surveys that cover period one month during advanced stage melt. We show degree bottom increases with draft for first-year and second-year level ice, ridge, an average 0.45 m, 0.55 0.95 m snow in observation period, respectively. investigated ridge 4.6 keel draft,...