A5077615986- Arctic and Antarctic ice dynamics
- Oceanographic and Atmospheric Processes
- Methane Hydrates and Related Phenomena
- Climate change and permafrost
- Geological Studies and Exploration
- Cryospheric studies and observations
- Climate variability and models
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Marine and environmental studies
- Microbial Community Ecology and Physiology
- Food Industry and Aquatic Biology
- Arctic and Russian Policy Studies
- Aquatic and Environmental Studies
- Hydrocarbon exploration and reservoir analysis
- Marine and coastal ecosystems
- Avian ecology and behavior
- Protist diversity and phylogeny
- Indigenous Studies and Ecology
- Underwater Vehicles and Communication Systems
- Freezing and Crystallization Processes
- Geophysics and Gravity Measurements
- Evaluation of Teaching Practices
- Marine Biology and Ecology Research
- Environmental DNA in Biodiversity Studies
University Centre in Svalbard
2008-2024
Centre for Arctic Gas Hydrate, Environment and Climate
2020
University of Bergen
2003-2005
Abstract Barotropic flow along depth contours is found in accordance with standard geostrophic theory. A numerical model developed that studies the deviation from such a flow. The gives good approximation of dynamical processes on West Spitsbergen Shelf (WSS) and shows Current (WSC), main gateway Atlantic water (AW) toward Arctic, connects more easily to Isfjorden Trough than anywhere else shelf. circulation AW troughs WSS here named (STC). From hydrographical ocean current observations it...
Isfjorden, a broad Arctic fjord in western Spitsbergen, has shown significant changes hydrography and inflow of Atlantic Water (AW) the last decades that only recently have been observed Ocean north Svalbard. Variability trends this fjord's climate circulation are therefore analysed from observational reanalysis data during 1987 to 2017. Isfjorden experienced shift summer ocean structure 2006, AW generally bottom layer (with increasing thickness) higher up water column. This shift,...
Marine heatwaves (MHWs) can potentially alter ocean ecosystems with far-reaching ecological and socio-economic consequences. This study investigates the spatiotemporal evolution of main MHW characteristics in Barents Sea using high-resolution (0.25° × 0.25°) daily Surface Temperature (SST) data from 1982 to 2020. The results reveal that has experienced accelerated warming several more MHWs recent decades. Since 2004, an amplified increasing SST trend was observed across entire Sea, a...
The Svalbard archipelago in the High Arctic is influenced by cold water masses from north-east and warm West Spitsbergen Current flowing northwards along its western coast. eastern waters fjords are normally frozen during winter months, while coastal west of remain open. Norwegian fishers have been harvesting for decades detailed records catches exists 1980 onwards. We analyze catch zone (approximately ICES area IIb). large fishery capelin summer yielding annual up to 737 000 tons was closed...
Abstract Observations were made of oceanic currents, hydrography, and microstructure in the southern Yermak Plateau summer 2007. The location is marginal ice zone at Arctic Front northwest Svalbard, where West Spitsbergen Current (WSC) carries warm Atlantic Water into Ocean. Time series approximately 1-day duration from five stations (upper 520 m) an 8-day a mooring are analyzed to describe characteristics internal waves turbulent mixing. spectral composition internal-wave field over 0.1–0.3...
Global warming, combined with an increasing influence of Atlantic Waters in the European Arctic, are causing a so-called Atlantification Arctic. This phenomenon is affecting plankton biomass and communities potential consequences for upper trophic levels. Using long-term data (2005-2020) from high Arctic zooplanktivorous seabird, little auk ( Alle alle ), we tested hypothesis that affects its diet, body condition demography. We based our study on collected three fjords West Spitsbergen,...
Sea ice loss and accelerated warming in the Barents have recently been one of main concerns climate research. In this study, we investigated trends possible relationships between sea surface temperature (SST), concentration (SIC), local large-scale atmospheric parameters over last 39 years (1982 to 2020). We examined interannual long-term spatiotemporal variability SST SIC by performing an empirical orthogonal function (EOF) analysis. The rate from 1982 through 2020 was 0.35 ± 0.04 °C/decade...
The Barents Sea is one of the main pathways for warm and saline Atlantic Water (AW) entering Arctic Ocean. It an important region water mass transformation dense-water production that contribute to meridional overturning circulation. Here, we present data from three cruises nine glider missions conducted between 2019 2022 in western Sea, compare with historical collected 1950 2009. We circulation pathways, hydrography, heat content volume fluxes Atlantic- Arctic-origin waters. Our...
Manual classification of fast ice, pack and polynya (open water thin ice) in Storfjorden from ERS‐2 SAR images during winters 1998 to 2001 was used determine model parameters a wind‐driven width model. Production ice the classified areas then calculated surface heat balance. The modeled open area occupied on average 10% total produced 58% ( T ). volume brine‐enriched shelf (BSW; V bsw ) estimated be range 0.9–1.1 × 10 12 m 3 or 0.06–0.07 Sv (freezing period average) 0.03–0.04 (annual...
Baroclinic instability in the West Spitsbergen Current is investigated, based on data from an array of current meter moorings along 78.83°N, across deeper (1000–2400 m) section continental slope west Svalbard. Numerical linear stability analyses are presented, utilizing a normal mode two‐layer model and idealizations baroclinic velocity field cross‐shelf bathymetry. The characteristic period, wavelength, growth rate unstable vorticity waves revealed, appearing as two distinct peaks rate,...
Abstract In situ field measurements of an active polynya in Storfjorden, Svalbard, during April 2006 are presented. A surface heat flux, estimated to be 400 W m −2 , produced frazil ice that was advected away from the fast edge end a event driven by cold winds northeast. Conductivity, temperature and depth casts were calibrated accompanying water samples, reveal supercooling lasted for 3 days 5 deep column. Surface salinity reached 35.9 psu brine release growth. The maximum measured 0.037 ±...
Observations were made of the dense overflow from Storfjorden a survey conducted at closely spaced stations in August 2002. The field data set consists conventional conductivity‐temperature‐depth profiles and short‐term moored current meters thermistor strings. Finestructure estimates by calculating Thorpe scales over identified overturns using 0.1‐dbar vertically averaged density profiles. Dissipation rate turbulent kinetic energy per unit mass, ε, is estimated assuming proportionality...
Observations of hydrography and currents in the active Storfjorden polynya during fieldwork April 2004 2006 are presented. The adds salt from its efficient ice production, usually increasing density ∼0.15 kg m −3 . Downflow dense water coastal to deeper basin enclosed by sill was captured both years. had a period strong heat loss intense frazil growth polynya. This created downflow brine‐enriched shelf (BSW) with maximum salinity 35.25, i.e., an increased ∼0.4 above that source water. In...
Abstract Observational data covering currents and temperature through two contrasting autumn to spring periods (2010/2011 2013/2014) at the constricted entrance inner basin of Hornsund fjord, Svalbard, are investigated. This fjord is presently undergoing significant changes, manifested by reduction seasonal sea ice cover retreating tidewater glacier fronts. The set presented here shows how local wind, tides, longer period current fluctuations allow warm water Atlantic origin reach innermost...
Abstract Storfjorden, Svalbard, hosts a polynya in winter and is an important source region of Brine‐enriched Shelf Water (BSW) that, if dense enough, feeds the Arctic Ocean deep water reservoir. Changes BSW production may thus have far‐reaching impacts. We analyze mass distribution circulation Storfjorden trough south it, Storfjordrenna, using hydrographic sections occupied July 2016, following characterized by lowest ice coverage recorded Barents Sea. These observations reveal unusual...
Abstract Based on the high‐resolution Copernicus Arctic Regional Reanalysis (CARRA), this study investigates spatio‐temporal variations in air–sea heat exchange Isfjorden, Svalbard, during 2011–2021. Turbulent fluxes are found to be main driver of interannual variability net exchange. The complex terrain surrounding Isfjorden leads large spatial turbulent cooling season. is driven by sea ice insulating parts fjord surface from atmosphere, and orographic effects such as wind channeling...