A5031843399- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Icing and De-icing Technologies
- Calibration and Measurement Techniques
- Spacecraft and Cryogenic Technologies
- Infrared Target Detection Methodologies
- Environmental Education and Sustainability
- Spacecraft Design and Technology
- Rocket and propulsion systems research
- Innovative Approaches in Technology and Social Development
- Geological Studies and Exploration
- Soil Moisture and Remote Sensing
University of Bremen
2021-2024
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 rapid melt of snow and sea ice during the Arctic summer provides a significant source low-salinity meltwater to surface ocean on local scale. accumulation this on, under, around floes can result in relatively thin layers upper ocean. Due small-scale nature these upper-ocean features, typically order 1 m thick or less, they are rarely detected by standard methods, but nevertheless pervasive critically important summer. Observations Multidisciplinary drifting Observatory for Study Climate...
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....
Abstract Comparing helicopter‐borne surface temperature maps in winter and optical orthomosaics summer from the year‐long Multidisciplinary drifting Observatory for Study of Arctic Climate expedition, we find a strong geometric correlation between warm anomalies melt pond location following summer. Warm are associated with thinner snow ice, that is, depression refrozen leads, allow water accumulation during melt. January were 0.3–2.5 K warmer on sea ice later formed ponds. A one‐dimensional...
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...
Observations of sea ice surface temperature provide crucial information for studying Arctic climate, particularly during winter. We examined 1 m resolution maps from 35 helicopter flights between October 2, 2019, and April 23, 2020, recorded the Multidisciplinary drifting Observatory Study Climate (MOSAiC). The seasonal cycle average spanned 265.6 K on to 231.8 January 28, 2020. was affected by atmospheric changes varied across scales. Leads in (cracks open water) were particular interest...
The sea ice surface temperature is important to understand the Arctic winter heat budget. We conducted 35 helicopter flights with an infrared camera in 2019/2020 during Multidisciplinary Drifting Observatory for Study of Climate (MOSAiC) expedition. were performed from a local, 5 10 km scale up regional, 20 40 scale. recorded thermal brightness temperatures, which we converted temperatures. More than 150000 images all can be investigated individually. As advanced data product, created maps...
Abstract. Leads and fractures in sea ice play a crucial role the heat gas exchange between ocean atmosphere, impacting atmospheric, ecological, oceanic processes. Our aim was to estimate lead fractions from high-resolution divergence obtained satellite synthetic-aperture radar (SAR) data evaluate it against existing products. We derived two new lead-fraction products with spatial resolution of 700 m calculated daily Sentinel-1 images. For first product, we advected accumulated individual...
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...
Arctic sea ice is changing rapidly. Its retreat significantly impacts heat fluxes, ocean currents, and ecology, warranting the continuous monitoring tracking of changes to extent thickness. L-band (1.4 GHz) microwave radiometry can measure thickness for thin ≤1 m, depending on salinity temperature. The sensitivity makes measurements complementary radar altimetry which thick with reasonable accuracy. During Multidisciplinary drifting Observatory Study Climate (MOSAiC) expedition, we deployed...
Surface temperature is crucial in studying the Arctic climate, particularly during winter. We examine 1 m resolution surface maps of 35 helicopter flights between 02 October 2019 and 23 April 2020, recorded Multidisciplinary drifting Observatory for Study Climate (MOSAiC). The seasonal cycle average spans from 265.6 K on to 231.8 28 January 2020. affected by atmospheric changes also varies across scales. Furthermore, we concentrate leads sea ice because they allow greater heat exchange ocean...
Comparing helicopter-borne surface temperature maps in winter and optical orthomosaics summer from the year-long Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) expedition, we find a strong geometric correlation between warm anomalies melt pond location following summer. Warm are attributed to thinner snow ice on level compared deformed surroundings or refrozen leads with only newly formed, thin ice. January were 0.3 K 2.5 warmer sea that later formed ponds. A...
<p>The MOSAiC expedition took place in the Arctic from September 2019 to October 2020 while having measurements under, in, and above sea ice for a complete annual cycle. Airborne thermal infrared imaging was conducted during 41 helicopter survey flights along drift track. We analyze brightness temperature of snow, ice, ocean water surfaces until May airborne measurements. While snow-covered appears very cold, thin open are significantly warmer. These surface types will be...
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