A5100665562- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Winter Sports Injuries and Performance
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Oceanographic and Atmospheric Processes
- Geological formations and processes
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Polar Research and Ecology
- Landslides and related hazards
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Climate variability and models
- Marine animal studies overview
- Geomagnetism and Paleomagnetism Studies
- Adventure Sports and Sensation Seeking
- Meteorological Phenomena and Simulations
- High Altitude and Hypoxia
- Remote Sensing and LiDAR Applications
- Aerospace Engineering and Energy Systems
- Marine and environmental studies
- Climate Change and Environmental Impact
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
University of Gothenburg
2015-2025
ORCID
2021
University of Bergen
2020
Korea Polar Research Institute
2019
Stockholm University
2007
University of Oslo
2004-2006
The contourite paradigm was conceived a few decades ago, yet there remains need to establish sound connection between deposits, basin evolution and oceanographic processes. Significant recent advances have been enabled by various factors, including the establishment of two IGCP projects realisation several IODP expeditions. Contourites were first described in Northern Southern Atlantic Ocean, since then, discovered every major ocean even lakes. 120 areas presently known are associated myriad...
Editor’s note: For easy download the posted pdf of State Climate for 2016 is a very low-resolution file. A high-resolution copy report available by clicking here. Please be patient as it may take few minutes file to download.
Abstract Editor’s note: For easy download the posted pdf of State Climate for 2017 is a low-resolution file. A high-resolution copy report available by clicking here. Please be patient as it may take few minutes file to download.
Abstract The thinning and acceleration of the West Antarctic Ice Sheet has been attributed to basal melting induced by intrusions relatively warm salty water across continental shelf. A hydrographic section including lowered acoustic Doppler current profiler measurements showing such an inflow in channel leading Getz Dotson Shelves is presented here. flow rate was 0.3–0.4 Sv (1 ≡ 106 m3 s−1), subsurface heat loss estimated be 1.2–1.6 TW. Assuming that persists throughout year, it corresponds...
The Southern Ocean is disproportionately important in its effect on the Earth system, impacting climatic, biogeochemical and ecological systems, which makes recent observed changes to this system cause for global concern. enhanced understanding improvements predictive skill needed projecting future states of require sustained observations. Over last decade, Observing System (SOOS) has established networks enhancing regional coordination research community groups advance development observing...
The first oceanographic observations underneath Thwaites Ice Shelf front show previously unknown pathways for warm currents.
Abstract Understanding the recent history of Thwaites Glacier, and processes controlling its ongoing retreat, is key to projecting Antarctic contributions future sea-level rise. Of particular concern how glacier grounding zone might evolve over coming decades where it stabilized by sea-floor bathymetric highs. Here we use geophysical data from an autonomous underwater vehicle deployed at Glacier ice front, document ocean-floor imprint past retreat a sea-bed promontory. We show patterns...
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Abstract The ice shelves in the Amundsen Sea are thinning rapidly, and main reason for their decline appears to be warm ocean currents circulating below melting these from below. Ocean transport dense water onto shelf, channeled by bathymetric troughs leading deep inner basins. A hydrographic mooring equipped with an upward-looking ADCP has been placed one of on central shelf. two years (2010/11) data here used characterize inflow shelf During both years, layer thickness temperature peaked...
Ekman pumping induced by horizontally varying wind and sea ice drift is examined as an explanation for observed seasonal variation of the warm layer thickness circumpolar deep water on Amundsen Sea continental shelf. Spatial temporal in one troughs shelf (Dotson Trough) was measured during two oceanographic surveys a two-year mooring deployment. A hydrographic transect from ocean, across break, into trough shows local elevation at break. On shelf, flows south-east along trough, gradually...
An object-based method for automatic iceberg detection from Advanced Synthetic Aperture Radar (ASAR) images has been developed and applied in the Amundsen Sea, Antarctica. The identification is based on brightness spatial parameters of ASAR at five scale levels, was verified with manual classification four areas chosen to represent varying environmental conditions. presented algorithm works comparatively well ocean freezing temperatures strong wind conditions, common Sea. rate 96.2% which...
Abstract. The geometry of the sea floor immediately beyond Antarctica's marine-terminating glaciers is a fundamental control on warm-water routing, but it also describes former topographic pinning points that have been important for ice-shelf buttressing. Unfortunately, this information often lacking due to inaccessibility these areas survey, leading modelled or interpolated bathymetries being used as boundary conditions in numerical modelling simulations. At Thwaites Glacier (TG) critical...
Abstract Variability in the heat delivery by Circumpolar Deep Water (CDW) is responsible for modulating basal melting of Amundsen Sea ice shelves. However, mechanisms controlling CDW inflow to region’s continental shelf remain little understood. Here, a high-resolution regional model used assess processes governing Sea. The key are identified decomposing temperature variability into two components associated with 1) changes depth isopycnals [heave (HVE)], and 2) [water mass property (WMP)]....
Abstract The changing supply of warm Circumpolar Deep Water (CDW) to the West Antarctic continental shelf is responsible for basal melting and thinning ice shelves that has occurred in recent decades. Here we assess variability CDW supply, its drivers, from a multiyear mooring deployed in, regional ocean model spanning, Getz‐Dotson Trough, Amundsen Sea. Between 2010 2015, within trough underwent pronounced cooling freshening, associated with changes thermohaline properties on isopycnals....
Large‐scale turbidity currents in submarine channels often show a significant asymmetry the heights of their levee banks. In Northern Hemisphere, there are many observations right‐hand channel being noticeably higher than left‐hand levee, phenomenon that is usually attributed to effect Coriolis forces upon currents. This article presents results from an analog model documents influence on dynamics gravity flowing straight channels. The transverse velocity structure, downstream velocity, and...
Abstract The exchange of warm, salty seawater across the continental shelves off West Antarctica leads to subsurface glacial melting at interface between ocean and Antarctic Ice Sheet. One mechanism that contributes cross-shelf transport is Ekman induced by along-slope currents over slope shelf break. An investigation this process applied Amundsen Sea shelfbreak region, using recently acquired historical field data guide analyses. Along-slope were observed transects eastern western reaches...
Abstract The circulation pathways and subsurface cooling freshening of warm deep water on the central Amundsen Sea shelf are deduced from hydrographic transects four moorings. continental is intersected by Dotson trough (DT), leading outer to basins inner shelf. During measurement period, was observed flow southward eastern side DT in approximate geostrophic balance. A northward outflow also along bottom western DT. Estimates rate suggest that up one-third inflowing leaves area below...
Abstract The Getz Ice Shelf is one of the largest sources fresh water from ice shelf basal melt in Antarctica. We present new observations three moorings west Siple Island 2016–2018. All show a persistent flow modified Circumpolar Deep Water toward western Shelf. Unmodified with temperatures up to 1.5 °C reaches front frequent episodes. These represent warmest observed at any Amundsen Sea. Mean currents within warm bottom layer 18–20 cm/s imply an advection time scale 7 days break front....
Abstract The Antarctic Roadmap Challenges (ARC) project identified critical requirements to deliver high priority research in the 21st century. ARC addressed challenges of enabling technologies, facilitating access, providing logistics and infrastructure, capitalizing on international co-operation. Technological include: i) innovative automated situ observing systems, sensors interoperable platforms (including power demands), ii) realistic holistic numerical models, iii) enhanced remote...
Knowledge gaps about how the ocean melts Antarctica's ice shelves, borne from a lack of observations, lead to large uncertainties in sea level predictions. Using high-resolution maps underside Dotson Ice Shelf, West Antarctica, we reveal imprint that shelf basal melting leaves on ice. Convection and intermittent warm water intrusions form widespread terraced features through slow quiescent areas, while shear-driven turbulence rapidly smooth, eroded topographies outflow as well enigmatic...
The Amundsen Sea is one of the most productive polynyas in Antarctic per unit area and undergoing rapid changes including a reduction sea ice duration, thinning sheets, retreat glaciers potential collapse Thwaites Glacier Pine Island Bay. A growing body research has indicated that these are altering water mass properties associated biogeochemistry within polynya. Unfortunately difficulties accessing remote location have greatly limited amount situ data been collected. In this study from...