A5001613631- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Cephalopods and Marine Biology
- Marine Biology and Environmental Chemistry
- Marine animal studies overview
- Marine and coastal ecosystems
- Aquatic Invertebrate Ecology and Behavior
- Marine and fisheries research
- Paleontology and Stratigraphy of Fossils
- Ocean Acidification Effects and Responses
- Crustacean biology and ecology
UiT The Arctic University of Norway
2015-2022
Centre for Arctic Gas Hydrate, Environment and Climate
2015-2020
Abstract Cold seeps can support unique faunal communities via chemosynthetic interactions fueled by seabed emissions of hydrocarbons. Additionally, cold enhance habitat complexity at the deep seafloor through accretion methane derived authigenic carbonates (MDAC). We examined infaunal and megafaunal community structure high‐Arctic analyses benthic samples photographs from pockmarks exhibiting highly elevated concentrations in sediments water column Vestnesa Ridge (VR), Svalbard (79° N)....
Abstract. Biogeochemical cycling in the semi-enclosed Arctic Ocean is strongly influenced by land–ocean transport of carbon and other elements vulnerable to environmental climate changes. Sediments are an important part biogeochemical provide opportunity study present historical input fate organic matter (e.g., through permafrost thawing). Comprehensive sedimentary records required compare differences between regions budgets. To this end, Circum-Arctic Sediment CArbon DatabasE (CASCADE) was...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 552:1-18 (2016) - DOI: https://doi.org/10.3354/meps11773 FEATURE ARTICLE Arctic cold seeps in marine methane hydrate environments: impacts on shelf macrobenthic community structure offshore Svalbard Emmelie K. L. Åström1,*, Michael Carroll1,2, William G. Ambrose Jr.1,3,4, JoLynn Carroll1,2 1CAGE – Centre for...
Abstract. Cold-seep megafaunal communities around gas hydrate mounds (pingos) in the western Barents Sea (76∘ N, 16∘ E, ∼400 m depth) were investigated with high-resolution, geographically referenced images acquired an ROV and towed camera. Four pingos associated seabed methane release hosted diverse biological of mainly nonseep (background) species including commercially important fish crustaceans, as well a new to this area (the snow crab Chionoecetes opilio). We attribute presence most...
Cold-seep benthic communities in the Arctic exist at nexus of two extreme environments; one reflecting harsh physical extremes environment, and another chemical strong environmental gradients associated with seafloor seepage methane toxic sulfide enriched sediments. Recent ecological investigations cold seeps numerous locations on margins Ocean basin reveal that seabed reduced gas fluids strongly influence marine ecosystems. These seep are mostly different from both conventional as well...
Abstract We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (∼1200 m water depth) and western Svalbard (79°00′ N, 06°55′ W) to provide insight into temporal spatial dynamics of seabed methane seeps. The beds, dominated by genera family Vesicomyidae: Phreagena s.l. Isorropodon sp., were 20–30 cm thick centered at 250–400 deep cores. carbon isotope composition inorganic (δ 13 C −13.02‰ +2.36‰) organic −29.28‰ −21.33‰) material a...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 629:19-42 (2019) - DOI: https://doi.org/10.3354/meps13101 Chemosynthesis influences food web and community structure in high-Arctic benthos Emmelie K. L. Åström1,2,*, Michael Carroll1,3, Arunima Sen1,9, Helge Niemann1,4,5,6, William G. Ambrose Jr.3,7, Moritz F. Lehmann4, JoLynn Carroll3,8 1CAGE-Centre for...
Benthic communities below the photic zone are largely reliant on export of surface-water primary production and flux partially degraded organic matter to seabed, i.e. pelagic−benthic coupling. Over past decades, however, role chemosynthetically produced carbon in food webs has been recognized various habitats. Cold seeps now known be widespread across circumpolar Arctic shelves where natural release hydrocarbons occurs at seabed. Here, we investigated what extent chemosynthesis-based (CBC)...
Bivalves have been found in unique benthic assemblages associated with active methane seeps and mounds along the western southern margins of Svalbard shelf (75–79°N) at 350–380 m depth. Among samples collected were a number shells Thyasiridae that are distinct from any species previously described. Here we describe one new genus Rhacothyas gen. nov. two Thyasira capitanea sp. kolgae nov., including their distinguishing characteristics environmental setting where they found. is large compared...
We report, for the first time, solemyid Acharax svalbardensis sp. nov., from deep-sea methane seep sites on western Svalbard margin, 79°N. This species is rather small and so far northernmost representative of its genus. It identified based following combination diagnostic characters: umbo 27–30% valve length posterior margin; H/L ratio ∼0.35; broadly rounded to truncated anterior 15 moderately developed, flat double ribs with middle about as strong ribs. The shells nov. were found in...
Abstract. Cold seep communities around gas hydrate mounds (pingos) in the Western Barents Sea (76°N, 16°E, ~400 m depth) were investigated with high resolution, geographically referenced images acquired an ROV and towed camera. Four pingos associated seabed methane release hosted diverse biological of mainly non-seep (background) species including commercially important fish crustaceans, as well a new to this area (the snow crab Chionoecetes opilio). We attribute presence most benthic...
The main goal of CAGE 15-2 cruise was to study the gas hydrate system and methane emissions off western Svalbard in Storfjordrenna. We addressed this through a comprehensive scientific program comprising dives with MISO-‐Tow Cam adapted multicorer frame from UiT-‐NPI (TowCam/Multicorer, TCM), measurements sediments water column, sediment coring (multicorer + gravitycorer), column biogeochemistry, microbiology, micropaleontology, macrobiology, bathymetric mapping. In addition, during...
Joint Cruise 1-2 with R/V Kronprins Haakon addressed objectives of RF1, RF2 and RF3 on the Nansen Legacy main transect in open water within sea ice. The focus was comparing state physical, chemical biological conditions southern northern parts study area. Given this first research cruise vessel, also focused testing gear equipment, establishing routines for deployments, collaboration, data management storing.
Abstract. Biogeochemical cycling in the extensive shelf seas and interior basins of semi-enclosed Arctic Ocean are strongly influenced by land-ocean transport carbon other elements. The cycle system is also inherently connected with climate, thus vulnerable to environmental climate changes. Sediments an active integral part biogeochemical cycling, provide opportunity study present historical input fate organic matter (e.g., through permafrost thawing). To compare differences between regions...
From the evening of June 29th to July 10th 2018, CAGE at Department Geology Uit, Arctic University Norway, arranged a scientific cruise aimed investigating methane seep sites by surface sediment sampling, core plankton sampling and water sampling. The areas for investigation were Barents Sea (Crater area), Storfjorden Trough (Pingo area),East Greenland Ridge (non-seep, IODP-proposal) (Leg 1 2) western Svalbard margin, Vestnesa Ridge, Ocean Prins Karls Forland 3) on R/V “Helmer Hanssen”. was...
A total of 15 gravity cores (c. 60 m), and 31 CTD (conductivity-temperature-depth) casts were performed, 11 plankton net (no. 12 failed because the was torn completely), 22 boxcore samples x 6 surface for each, searched Siboglinid polychaetes about half sampled. 137 lines acoustics seismics together performed. Chirp profiles multibeam acquired during transits in surveys (mapping new seep sites northeast “Crater” area, Storfjorden Trough glacial grounding zone wedges, East Greenland Ridge,...