A5053887696- Arctic and Antarctic ice dynamics
- Oceanographic and Atmospheric Processes
- Marine animal studies overview
- Cryospheric studies and observations
- Climate change and permafrost
- Freezing and Crystallization Processes
- Arctic and Russian Policy Studies
- Atmospheric and Environmental Gas Dynamics
- Soil Moisture and Remote Sensing
- GNSS positioning and interference
- Marine and environmental studies
- Food Industry and Aquatic Biology
- Climate variability and models
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Indigenous Studies and Ecology
- Marine and coastal plant biology
- Technology Assessment and Management
- European and International Law Studies
- Polar Research and Ecology
- Integrated Water Resources Management
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2023-2025
Universität Trier
2015-2024
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2024
With the Arctic rapidly changing, needs to observe, understand, and model changes are essential. To support these needs, an annual cycle of observations atmospheric properties, processes, interactions were made while drifting with sea ice across central during Multidisciplinary Observatory for Study Climate (MOSAiC) expedition from October 2019 September 2020. An international team designed implemented comprehensive program document characterize all aspects system in unprecedented detail,...
The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) was a yearlong expedition supported by icebreaker R/V Polarstern, following Transpolar Drift from October 2019 to 2020. campaign documented an annual cycle physical, biological, and chemical processes impacting atmosphere-ice-ocean system. Of central importance were measurements thermodynamic dynamic evolution sea ice. A multi-agency international team led University Colorado/CIRES NOAA-PSL observed...
Abstract. High-resolution MODIS thermal infrared satellite data are used to infer spatial and temporal characteristics of 17 prominent coastal polynya regions over the entire Arctic basin. Thin-ice thickness (TIT) distributions (≤ 20 cm) calculated from ice-surface temperatures, combined with ECMWF ERA-Interim atmospheric reanalysis in an energy balance model for 13 winter seasons (2002/2003 2014/2015; November March). From all available swath data, daily thin-ice composites computed order...
Abstract Precise knowledge of wintertime sea ice production in Arctic polynyas is not only required to enhance our understanding atmosphere‐sea ice‐ocean interactions but also verify frequently utilized climate and ocean models. Here, a high‐resolution (2‐km) Moderate Resolution Imaging Spectroradiometer (MODIS) thermal infrared satellite data set featuring spatial temporal characteristics 17 polynya regions for the winter seasons 2002/2003 2017/2018 directly compared an akin low‐resolution...
The North Water (NOW) Polynya is a regularly-forming area of open-water and thin-ice, located between northwestern Greenland Ellesmere Island (Canada) at the northern tip Baffin Bay. Due to its large spatial extent, it high importance for variety physical biological processes, especially in wintertime. Here, we present long-term remote sensing study winter seasons 1978/1979 2014/2015. characteristics are inferred from (1) sea ice concentrations brightness temperatures passive microwave...
Over a five-month time window between March and July 2020, scientists deployed two small uncrewed aircraft systems (sUAS) to the central Arctic Ocean as part of legs three four MOSAiC expedition. These sUAS were flown measure thermodynamic kinematic state lower atmosphere, including collecting information on temperature, pressure, humidity winds surface 1 km, well document ice properties, albedo, melt pond fraction, open water amounts. The atmospheric flights primarily conducted by DataHawk2...
Abstract. The quantification of sea-ice production in the Laptev Sea polynyas is important for Arctic budget and heat loss to atmosphere. We estimated ice winter season 2007/2008 (November–April) based on simulations with regional climate model COSMO-CLM at a horizontal resolution 5 km compared it remote sensing estimates. A reference five sensitivity were performed different assumptions grid-scale subgrid-scale thickness considered within polynyas, using tile approach fractional sea ice. In...
Abstract During Arctic summer, meltwater inputs and a fragmented ice cover impede quantifying the role of boundary stress for turbulent mixing in ice-ocean layer. Here we show that less than two-thirds kinetic energy (TKE) generated from mean flow shear under drifting sea is dissipated, remainder can be attributed to balancing stabilizing buoyancy fluxes. We deployed high-resolution acoustic Doppler current profiler an floe estimate Reynolds stress, production dissipation rate TKE. At 0.75 m...
Abstract. Spatial and temporal characteristics of the Storfjorden polynya, which forms regularly in proximity islands Spitsbergen, Barentsøya Edgeøya Svalbard archipelago under influence strong northeasterly winds, have been investigated for period 2002/2003 to 2013/2014 using thermal infrared satellite imagery. Thin-ice thicknesses were calculated from MODIS ice-surface temperatures combined with ECMWF ERA-Interim atmospheric reanalysis data an energy-balance model. Associated quantities...
The opacity of clouds is the main problem for optical and thermal space-borne sensors, like Moderate-Resolution Imaging Spectroradiometer (MODIS). Especially during polar nighttime, low contrast between underlying snow/ice results in deficiencies MODIS cloud mask affected products. There are different approaches to retrieve information about frequently cloud-covered areas, which often operate with large amounts days aggregated into single composites a long period time. These well suited...
We examined snow sinks caused by and sea ice interactions (snow-ice formation sub-parcel mass redistribution) on level in the Arctic. coupled SnowModel-LG, a modeling system adapted for depth density reconstruction over ice, with HIGHTSI, 1-D thermodynamic model, to create SMLG_HS. Pan-Arctic model simulations spanned from 1 August 1980 through 31 July 2022. Evaluation of SMLG_HS against depth, snow-ice, thickness observations highlighted importance changes due redistribution processes....
Knowledge of the wintertime sea-ice production in Arctic polynyas is an important requirement for estimations dense water formation, which drives vertical mixing upper ocean. Satellite-based techniques incorporating relatively high resolution thermal-infrared data from MODIS combination with atmospheric reanalysis have proven to be a strong tool monitor large and regularly forming resolve narrow thin-ice areas (i.e., leads) along shelf-breaks across entire Ocean. However, selection sets has...
Abstract. A tile-approach (TA) for the calculation of energy balance over fractional sea ice was implemented into standard version COSMO-CLM (CCLM) model. The accounts subgrid-scale exchange within polynyas and leads, which are neglected in CCLM version. We perform six simulations area Laptev Sea at a horizontal resolution 5 km winter season 2007/08 (Nov–Apr) with different grid-scale thicknesses polynyas. reference run without TA assumes ice-thickness 10 cm (derived as mean thin-ice...
Abstract. High-resolution MODIS thermal infrared satellite data are used to infer spatial and temporal characteristics of 16 prominent coastal polynya regions over the entire Arctic basin. Thin-ice thickness distributions (≤ 20 cm) calculated from ice-surface temperatures, combined with ECMWF ERA-Interim atmospheric reanalysis in an energy balance model for 13 winter-seasons (2002/2003 2014/2015; November March). From all available swath-data, (quasi-) daily thin-ice composites computed...
Abstract. Spatial and temporal characteristics of the Storfjorden polynya, which forms regularly in proximity islands Spitsbergen, Barentsøya Edgeøya Svalbard archipelago under influence strong north-easterly winds, have been investigated for period 2002/2003 to 2013/2014 using thermal infrared satellite imagery. Thin-ice thicknesses were calculated from MODIS ice-surface temperatures, combined with ECMWF ERA-Interim atmospheric reanalysis data an energy-balance model. Based on thin-ice...
We examined the effect of snow-ice formation on SnowModel-LG snow depth and density products. coupled SnowModel-LG, a modeling system adapted for reconstruction over sea ice, with HIGHTSI, 1-D thermodynamic ice model, to create SnowModel-LG_HS. Pan-Arctic model simulations spanned from 1 August 1980 through 31 July 2022. In SnowModel-LG_HS, domain average decreased by 20%, increased 2% when compared largest differences in Atlantic sector. Averaged across CryoSat-2 era (2011–2022), April...
We examined snow sinks caused by and sea ice interactions (snow-ice formation sub-parcel mass redistribution) on Arctic level ice. coupled SnowModel-LG, a modeling system adapted for depth density reconstruction over ice, with HIGHTSI, 1-D thermodynamic model, to create SMLG HS. Pan-Arctic model simulations spanned from 1 August 1980 through 31 July 2022. Evaluation of HS against depth, snow-ice, thickness observations highlighted the importance changes due redistribution processes. The...
Abstract. The diel vertical migration (DVM) of zooplankton is one the largest species migrations to occur globally and a key driver regional ecosystems marine carbon pump. Previously thought be hampered by extreme light regime prevailing in Arctic Ocean, observations have revealed that DVM does ice-covered waters suggest decline sea ice may thereby impact its role ecosystem. However, coastal polynyas present unique environment where open water or thin, nearly translucent, prevail when...
Abstract. The diel vertical migration (DVM) of zooplankton is one the largest species migrations to occur globally and a key driver regional ecosystems marine carbon pump. Previously thought be hampered by extreme light regime prevailing in Arctic Ocean, observations have revealed that DVM does ice-covered waters suggest decline sea ice may thereby impact its role ecosystem. However, coastal polynyas present unique environment where open water or thin, nearly translucent, prevail when...