English
norskBlar i forfatter "Carroll, Michael Leslie"
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Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-05)We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (1200 m water depth) and western Svalbard (798000 N, 068550 W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two genera of the family Vesicomyidae: Phreagena s.l. and Isorropodon sp., were 20–30 cm thick and centered at ... -
Cold Seeps in a Warming Arctic: Insights for Benthic Ecology
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-21)Cold-seep benthic communities in the Arctic exist at the nexus of two extreme environments; one reflecting the harsh physical extremes of the Arctic environment and another reflecting the chemical extremes and strong environmental gradients associated with seafloor seepage of methane and toxic sulfide-enriched sediments. Recent ecological investigations of cold seeps at numerous locations on the ... -
Geophysical and geochemical controls on the megafaunal community of a high Arctic cold seep
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-25)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 with an ROV and towed camera. Four pingos associated with seabed methane release hosted diverse biological communities of mainly nonseep (background) species including commercially important fish ... -
Methane cold seeps as biological oases in the high-Arctic deep sea
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-27)Cold seeps can support unique faunal communities via chemosynthetic interactions fueled by seabed emissions of hydrocarbons. Additionally, cold seeps can enhance habitat complexity at the deep seafloor through the accretion of methane derived authigenic carbonates (MDAC). We examined infaunal and megafaunal community structure at high-Arctic cold seeps through analyses of benthic samples and ... -
A new genus and two new species of Thyasiridae associated with methane seeps off Svalbard, Arctic Ocean
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-16)Bivalves have been found in unique benthic assemblages associated with active methane seeps and mounds along the western and southern margins of the Svalbard shelf (75–79°N) at 350–380 m depth. Among the samples collected were a number of shells of Thyasiridae that are distinct from any species previously described. Here we describe one new genus Rhacothyas gen. nov. and two new species Thyasira ... -
Postglacial response of Arctic Ocean gas hydrates to climatic amelioration
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-05)Seafloor methane release due to the thermal dissociation of gas hydrates is pervasive across the continental margins of the Arctic Ocean. Furthermore, there is increasing awareness that shallow hydrate-related methane seeps have appeared due to enhanced warming of Arctic Ocean bottom water during the last century. Although it has been argued that a gas hydrate gun could trigger abrupt climate ... -
Seafloor warm water temperature anomalies impact benthic macrofauna communities of a high-Arctic cold-water fjord
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-06-05)Amid the alarming atmospheric and oceanic warming rates taking place in the Arctic, western fjords around the Svalbard archipelago are experiencing an increased frequency of warm water intrusions in recent decades, causing ecological shifts in their ecosystems. However, hardly anything is known about their potential impacts on the until recently considered stable and colder northern fjords. We ...
