A5101555760- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Icing and De-icing Technologies
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Winter Sports Injuries and Performance
- Freezing and Crystallization Processes
- Scientific Research and Discoveries
- Food Industry and Aquatic Biology
- Marine and environmental studies
- Geology and Paleoclimatology Research
- Spacecraft and Cryogenic Technologies
- Arctic and Russian Policy Studies
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Soil Moisture and Remote Sensing
- Marine and coastal ecosystems
- Polar Research and Ecology
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Crystallization and Solubility Studies
- Geological Studies and Exploration
- X-ray Diffraction in Crystallography
- Underwater Acoustics Research
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2011-2025
University of Bremen
2016-2025
University of Alberta
2012-2024
York University
2015-2024
Swiss Federal Institute for Forest, Snow and Landscape Research
2024
Memorial University of Newfoundland
2024
University of Canterbury
2024
Australian Wool Innovation (Australia)
2020-2022
Hochschule Fresenius
2022
TU Dortmund University
2020-2021
Satellite records show a decline in ice extent over more than three decades, with record minimum September 2012. Results from the Pan‐Arctic Ice‐Ocean Modelling and Assimilation system (PIOMAS) suggest that has been accompanied by volume, but this not confirmed data. Using new data European Space Agency CryoSat‐2 (CS‐2) mission, validated situ data, we generate estimates of volume for winters 2010/11 2011/12. We compare these current PIOMAS earlier (2003–8) National Aeronautics...
Abstract. Sea-ice thickness on a global scale is derived from different satellite sensors using independent retrieval methods. Due to the sensor and orbit characteristics, such retrievals differ in spatial temporal resolution as well sensitivity certain sea-ice types ranges. Satellite altimeters, CryoSat-2 (CS2), sense height of ice surface above sea level, which can be converted into thickness. Relative uncertainties associated with this method are large over thin regimes. Another based...
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...
Abstract The Weddell Gyre (WG) is one of the main oceanographic features Southern Ocean south Antarctic Circumpolar Current which plays an influential role in global ocean circulation as well gas exchange with atmosphere. We review state‐of‐the art knowledge concerning WG from interdisciplinary perspective, uncovering critical aspects needed to understand this system's shaping future evolution oceanic heat and carbon uptake over next decades. limitations our are related conditions extreme...
Arctic Ocean properties and processes are highly relevant to the regional global coupled climate system, yet still scarcely observed, especially in winter. Team OCEAN conducted a full year of physical oceanography observations as part Multidisciplinary drifting Observatory for Study Climate (MOSAiC), drift with sea ice from October 2019 September 2020. An international team designed implemented program characterize system unprecedented detail, seafloor air-sea ice-ocean interface,...
Abstract Ice nucleating particles (INPs) affect the radiative properties of cold clouds. Knowledge concerning their concentration above ground level and potential sources is scarce. Here we present first highly temperature resolved ice nucleation spectra airborne samples from an aircraft campaign during late winter in 2018. Most INP featured low levels (<3 · 10 −4 L −1 at −15°C). However, also found concentrations up to 1.8·10 −2 −15°C freezing onsets as high −7.5°C for mainly marine...
Abstract Sea ice is an important transport vehicle for gaseous, dissolved and particulate matter in the Arctic Ocean. Due to recently observed acceleration sea drift, it has been assumed that more advected by Transpolar Drift from shallow shelf waters central Ocean beyond. However, this study provides first evidence intensified melt marginal zones of interrupts transarctic conveyor belt led a reduction survival rates exported Siberian shelves (−15% per decade). As consequence, less formed...
Sea ice thickness is a key parameter in the polar climate and ecosystem. Thermodynamic dynamic processes alter sea thickness. The Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) expedition provided unique opportunity to study seasonal changes same ice. We analyzed 11 large-scale (∼50 km) airborne electromagnetic surface roughness surveys from October 2019 September 2020. Data mass balance position buoys additional information. found that thermodynamic growth decay...
Snow is a critical component of the global water cycle and climate system, major source supply in many parts world. There lack spatially distributed information on accumulation snow land surfaces, glaciers, lake ice, sea ice. Satellite missions for systematic observations will be essential to improve representation cryosphere models advance knowledge prediction variability changes that depend ice resources. This paper describes scientific drivers technical approach proposed Cold Regions...
Helicopter‐borne electromagnetic sea ice thickness measurements were performed over the Transpolar Drift in late summers of 2001, 2004, and 2007, continuing ground‐based since 1991. These show an ongoing reduction modal mean thicknesses region North Pole up to 53 44%, respectively, 2001. A buoy derived age model showed that thinning was mainly due a regime shift from predominantly multi‐ second‐year earlier years first‐year which had summer 0.9 1.27 m. Measurements still persisted at April...
While summer Arctic sea‐ice extent has decreased over the past three decades, it is subject to large interannual and regional variations. Methodological challenges in measuring ice thickness continue hamper our understanding of response ice‐thickness distribution recent change, limiting ability forecast change next decade. We present results from a 2400 km long pan‐Arctic airborne electromagnetic (EM) survey April 2009, first‐ever large‐scale EM dataset obtained by fixed‐wing aircraft key...
Abstract The understanding of sea ice mass balance processes requires continuous monitoring the seasonal evolution thickness. While autonomous (IMB) buoys deployed over past two decades have contributed to scientists' growth and decay processes, deployment has been limited, in part, by cost such systems. Routine, basinwide cover is realistically achievable through a network reliable affordable instrumentation. This paper describes development novel platform sensor that replaces traditional...
Abstract The Arctic sea ice cover is rapidly shrinking, but a direct, longer‐term assessment of the thinning remains challenging. A new time series constructed from in situ measurements thickness at end melt season Fram Strait shows by over 50% during 2003–2012. modal and mean along 79°N decreased rate 0.3 0.2 m yr −1 , respectively, with long‐term averages 2.5 3 m. Airborne observations reveal an east‐west gradient across strait spring not summer due to advection more different source...
Abstract Satellite radar altimetry provides data to monitor winter Arctic sea-ice thickness variability on interannual, basin-wide scales. When using this technique an assumption is made that the peak of return originates from snow/ice interface. This has been shown be true in laboratory for cold, dry snow as case sea ice during winter. However, not tested field. We use airborne normal-incidence Ku-band altimeter and situ field measurements, collected CryoSat Validation Experiment (CryoVEx)...
Abstract. In September 2019, the research icebreaker Polarstern started largest multidisciplinary Arctic expedition to date, MOSAiC (Multidisciplinary drifting Observatory for Study of Climate) drift experiment. Being moored an ice floe a whole year, thus including winter season, declared goal is better understand and quantify relevant processes within atmosphere–ice–ocean system that impact sea mass energy budget, ultimately leading much improved climate models. Satellite observations,...
Abstract Antarctic sea ice that has been affected by supercooled Ice Shelf Water (ISW) a unique crystallographic structure and is called platelet ice. In this paper we synthesize observations to construct continent‐wide map of the winter presence ISW at ocean surface. The demonstrate that, in some regions coastal Antarctica, drives negative oceanic heat flux −30 Wm −2 persists for several months during winter, significantly affecting thickness. other regions, particularly where thinning...
Abstract. We combine satellite data products to provide a first and general overview of the physical sea ice conditions along drift international Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) expedition comparison with previous years (2005–2006 2018–2019). find that MOSAiC was around 20 % faster than climatological mean drift, as consequence large-scale low-pressure anomalies prevailing Barents–Kara–Laptev region between January March. In winter (October–April),...
Abstract The Multidisciplinary Drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition took place between October 2019 and September 2020 giving rare opportunity to monitor sea-ice properties over a full annual cycle. Here we present 24 high-resolution orthomosaics 14 photogrammetric digital elevation models surface around icebreaker RV Polarstern March 2020. dataset is based on >34.000 images acquired by helicopter-borne optical camera system with survey flights covering...
Abstract. Leads and fractures in sea ice play a crucial role the heat gas exchange between ocean atmosphere, impacting atmospheric, ecological, oceanic processes. We estimated lead fractions from high-resolution divergence obtained satellite synthetic aperture radar (SAR) data evaluated them against existing products. derived two new fraction products with spatial resolution of 700 m calculated daily Sentinel-1 images. For first product, we advected accumulated individual time instances....