English
norskBlar i forfatter "Kalenitchenko, Dimitri"
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Benthic Foraminifera in Arctic Methane Hydrate Bearing Sediments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-10)Benthic foraminifera have been widely used as proxy for paleo-methane emissions, mainly based on their stable isotopic signature. In cold seeps, the ecology of these organisms remains uncertain, in particular their ability to thrive during active phases of seepage. In this study, we evaluate the benthic foraminiferal response to methane seepage in Arctic sediments. We do so by examining living and ... -
Handwritten letters and photo albums linking geoscientists with school classes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-14)Was something lost as society moved away from “traditional” media such as handwritten letters and photography and into the digital age? Some of the authors remember this age fondly, and we wanted to see if this fondness could be translated into a science dialogue project with school classes. We designed and carried out a communication process with four classes at different schools across Europe. ... -
HgCl2 addition to pore water samples from cold seeps can affect the geochemistry of dissolved inorganic carbon ([DIC], δ13CDIC)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-03)The conventional use of mercuric chloride (HgCl<sub>2</sub>) as an antimicrobial agent in water samples for dissolved inorganic carbon (DIC) analysis poses health and environmental risks related to its handling and disposal. Even though there is an increasing interest in quantifying pore water DIC contribution to the ocean carbon cycle and deep-sea acidification, the paucity of comparative studies ... -
Historical contingency impacts on community assembly and ecosystem function in chemosynthetic marine ecosystems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-07)Predicting ecosystem functioning requires an understanding of the mechanisms that drive microbial community assembly. Many studies have explored microbial diversity extensively and environmental factors are thought to be the principal drivers of community composition. Community assembly is, however, also influenced by past conditions that might affect present-day assemblages. Historical events, ... -
The Impact of Methane on Microbial Communities at Marine Arctic Gas Hydrate Bearing Sediment
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)Cold seeps are characterized by high biomass, which is supported by the microbial oxidation of the available methane by capable microorganisms. The carbon is subsequently transferred to higher trophic levels. South of Svalbard, five geological mounds shaped by the formation of methane gas hydrates, have been recently located. Methane gas seeping activity has been observed on four of them, ... -
Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-07)The Arctic Ocean subseabed holds vast reservoirs of the potent greenhouse gas methane (CH<sub>4</sub>), often seeping into the ocean water column. In a continuously warming ocean as a result of climate change an increase of CH<sub>4</sub> seepage from the seabed is hypothesized. Today, CH<sub>4</sub> is largely retained in the water column due to the activity of methane-oxidizing bacteria (MOB) that ...
