Title: The role of the microbial controls on the methane cycle in the Arctic Ocean.
Abstract: Climate change in the Arctic threatens to destabilize the subsea methane reservoirs, posing a positive feedback to the Arctic amplification in the global change scenario. The aim of our research is to identify the Arctic Ocean as a sink or a source of methane, by studying the metabolic pathways altering the budget of this climate-relevant gas. Methane-oxidizing microbes (Methanotrophs) can oxidize the methane molecules into carbon dioxide, mitigating the methane release into the atmosphere. Contrarily, the Methanogens are organisms able to produce methane. Experiments on Arctic seawater, sea ice and freshwater samples in different seasons were setup to assess the microbial oxidation rate, production or neither. We measured in-situ methane concentrations and isotopic ratios in sea ice, seawater and freshwater samples, coupled with ex-situ incubations, from two Regions of the Arctic within different seasons. Here, we will show the results from the Northwest Passage Project (hold in the Canadian Arctic Archipelago during the Summer 2019) and the preliminary Summer data from the MOSAiC expedition (Multidisciplinary drifting Observatory for the Study of Arctic Climate, hold in the Central Arctic during Oct 2019 – Sept 2020). This dataset will allow us to map the biogeography of the methane cycling in the Arctic.
Meeting ID: 950 4977 6590
Wednesday, April 21 at 12:00pmVirtual Event
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