A5008346159- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Icing and De-icing Technologies
- Atmospheric chemistry and aerosols
- Educational Technology and Assessment
- Geology and Paleoclimatology Research
- Geophysics and Gravity Measurements
- Winter Sports Injuries and Performance
- Geological Studies and Exploration
- Chemistry and Stereochemistry Studies
- Environmental Education and Sustainability
- Innovative Approaches in Technology and Social Development
- Atmospheric aerosols and clouds
- Arsenic contamination and mitigation
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Atmospheric Ozone and Climate
Center for Snow and Avalanche Studies
2020-2024
Northumbria University
2024
UiT The Arctic University of Norway
2024
Swiss Federal Institute for Forest, Snow and Landscape Research
2021-2023
University of Bath
2021
University of California, Berkeley
1934
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. Data from the Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) expedition allowed us to investigate temporal dynamics snowfall, snow accumulation and erosion in great detail almost whole season (November 2019 May 2020). We computed cumulative water equivalent (SWE) over sea ice based on depth density retrievals a SnowMicroPen approximately weekly measured depths along fixed transect paths. used derived SWE cover compare with precipitation sensors...
The Arctic Ocean is an exceptional environment where hydrosphere, cryosphere, and atmosphere are closely interconnected. Changes in sea-ice extent thickness affect ocean currents, as well moisture heat exchange with the atmosphere. Energy water fluxes impact formation melting of sea ice snow cover. Here, we present a comprehensive statistical analysis stable isotopes various hydrological components central obtained during Multidisciplinary drifting Observatory for Study Climate (MOSAiC)...
The microstructure of the uppermost portions a melting Arctic sea ice cover has disproportionately large influence on how incident sunlight is reflected and absorbed in ice/ocean system. surface scattering layer (SSL) effectively backscatters solar radiation keeps albedo relatively high compared to with SSL manually removed. Measurements provide information incoming shortwave partitioned by have been pivotal improving climate model parameterizations. However, relationship between physical...
Abstract. Wind-driven redistribution of snow on sea ice alters its topography and microstructure, yet the impact these processes radar signatures is poorly understood. Here, we examine effects over Arctic waveforms backscatter obtained from a surface-based, fully polarimetric Ka- Ku-band at incidence angles between 0∘ (nadir) 50∘. Two wind events in November 2019 during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition are evaluated. During both events, changes...
Abstract. Arctic rain on snow (ROS) deposits liquid water onto existing snowpacks. Upon refreezing, this can form icy crusts at the surface or within snowpack. By altering radar backscatter and microwave emissivity, ROS over sea ice influence accuracy of variables retrieved from satellite altimetry, scatterometers, passive radiometers. During Ocean MOSAiC (Multidisciplinary drifting Observatory for Study Climate) expedition, there was an unprecedented opportunity to observe a event using in...
Landfast ice plays a significant role in climate and ecosystems Antarctic coastal regions. From October to December 2022, we investigated the physical properties of snow sea on landfast McMurdo Sound, following protocols from MSOAiC expedition. Our measurements confirmed some findings MOSAiC (e.g. potential mass transfer surface , high spatial variability depth}, discrepancy between meteorological snowfall accumulation),  but also had observations that were contrasting our data, for...
Abstract Snow plays an essential role in the Arctic as interface between sea ice and atmosphere. Optical properties, thermal conductivity mass distribution are critical to understanding complex system’s energy balance distribution. By conducting measurements from October 2019 September 2020 on Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition, we have produced a dataset capturing year-long evolution physical properties snow surface scattering layer, highly...
Abstract. Data from the Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) expedition allowed us to investigate temporal dynamics snowfall, snow accumulation, and erosion in great detail almost whole accumulation season (November 2019 May 2020). We computed cumulative water equivalent (SWE) over sea ice based on depth (HS) density retrievals a SnowMicroPen (SMP) approximately weekly-measured depths along fixed transect paths. Hence, SWE considers surface...
Abstract The “surface scattering layer” (SSL) is the highly‐scattering, coarse‐grained ice layer that forms on surface of melting, drained sea during spring and summer. Ice sufficient thickness with an SSL has observed persistent broadband albedo ∼0.65, resulting in a strong influence regional solar partitioning. Experiments Multidisciplinary drifting Observatory for Study Arctic Climate expedition showed re‐forms approximately 1 day following manual removal. Coincident spectral measurements...
Sea ice ridges are one of the most under-sampled and poorly understood components Arctic sea system. Yet, play a crucial role in mass balance have been identified as ecological hotspots for ice-associated flora fauna Arctic. To better understand ridges, we drilled sampled two different first-year (FYI) June–July 2020 during Multidisciplinary drifting Observatory Study Climate (MOSAiC). Ice cores were cut into 5 cm sections, melted, then analyzed salinity oxygen (δ18O) isotope composition....
Warm air intrusions over Arctic sea ice can change the snow and surface conditions rapidly alter concentration (SIC) estimates derived from satellite-based microwave radiometry without altering true SIC. Here we focus on two warm moist during Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition that reached research vessel Polarstern in mid-April 2020. After events, SIC deviations between different satellite products, including climate data records, were observed...
Snow and ice topography impact are impacted by fluxes of mass, energy, momentum in Arctic sea ice. We measured the on approximately a 0.5 km
Abstract. Snow significantly impacts the seasonal growth of Arctic sea ice due to its thermally insulating properties. Various measurements and parametrizations thermal properties exist, but an assessment entire evolution conductivity snow resistance is hitherto lacking. Using comprehensive data set from MOSAiC expedition, we have evaluated for first time snow's on different ages (leads, second-year ice) topographic features (ridges). Combining measurement assessing robustness against...
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...
OPINION article Front. Sustain., 09 February 2024Sec. Sustainable Organizations Volume 5 - 2024 | https://doi.org/10.3389/frsus.2024.1338660
Abstract. Arctic rain-on-snow (ROS) deposits liquid water onto existing snowpacks. Upon refreezing, this can form icy crusts at the surface or within snowpack. By altering radar backscatter and microwave emissivity, ROS over sea ice influence accuracy of variables retrieved from satellite altimetry, scatterometers, passive radiometers. During Ocean MOSAiC Expedition, there was an unprecedented opportunity to observe a event using in situ active instruments similar those deployed on...
Abstract. Snow-layer segmentation and classification are essential diagnostic tasks for various cryospheric applications. The SnowMicroPen (SMP) measures the snowpack's penetration force at submillimeter intervals in snow depth. resulting depth–force profile can be parameterized density specific surface area. However, no information on traditional types is currently extracted automatically. labeling of a time-intensive task that requires practice becomes infeasible large datasets. Previous...
<title>Abstract</title> The water isotope composition of the winter snow cover on Arctic sea ice is strongly enriched in heavy isotopes near snow-sea interface, incompatible with typical enrichment values through metamorphism processes alone. Our stratigraphic investigations from MOSAiC expedition, using computed tomography combined isotopic analyses snow, highlight that approximately 20% snowpack not meteoric origin but created ice. Here, we show sublimation under high-temperature gradients...
<title>Abstract</title> In the central Arctic, warm and moist air intrusions (WAMIs) are increasingly prevalent during winter spring, significantly impacting near-surface energy budget. This study investigates WAMI-induced transport wet deposition of black carbon (BC) its subsequent influence on snow properties melting. Using a modeling approach combined with extensive observational data from 2019–2020 Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) expedition, we...
Warm air intrusions over Arctic sea ice can rapidly change the snow and surfaceconditions alter concentration (SIC) estimates derived from satellite-based microwave radiometry without altering true SIC.Here we focus on two warm moist that produced surface glazing duringthe Multidisciplinary drifting Observatory for Study of Climate (MOSAiC)expedition reached research vessel Polarstern in mid-April 2020. After theevents, observe increased SIC deviations between different satellite...
Abstract. Wind transport alters the snow topography and microstructure on sea ice through redistribution controlled by deposition erosion. The impact of these processes radar signatures is poorly understood. Here, we examine effects Arctic from Ka- Ku-band signatures. Measurements were obtained during two wind events in November 2019 MOSAiC expedition. During both events, changes waveforms backscatter coincident with surface height measured a terrestrial laser scanner are observed. At...
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 general consensus, 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...