CC BY
8
УДК 528.7
В.В. Малахова, Е.Н. Голубева ИВМиМГ СО РАН, Новосибирск
РАСТВОРЕННЫЙ МЕТАН В ВОДАХ АРКТИЧЕСКОГО БАССЕЙНА: ДАННЫЕ НАБЛЮДЕНИЙ И РЕЗУЛЬТАТЫ МОДЕЛИРОВАНИЯ
V.V. Malakhova, E.N. Golubeva ICM and MG SB RAS, Novosibirsk
THE DISSOLVED METHANE TRANSPORT IN THE ARCTIC WATER: OBSERVED DATA AND RESULT OF MODELLING
As part of the global carbon cycle, enormous quantities of methane occur in marine sediments. The extensive Arctic shelves may play an important role in methane cycling because of their large area, shallow sea depth, and huge storage of organic matter buried in permafrost, which can be involved in modern biogeochemical cycles under warming.
Based on the literature observed data, an attempt was made to identify the main sources dissolved methane in the Arctic Ocean. One mechanism to release methane from the sediment to the ocean is through submarine mud volcanism, hydrocarbon seeps and vents. Other arctic sources of methane include methane gas hydrates: the shelf and continental slope reservoir is estimated to be roughly 6000 Gt. In third, the Siberian Rivers are a strong source of surface dissolved methane which comes from watersheds which are underlain with permafrost.
Accordingly, methane dissolved from the plume may transfer to surface waters and thus potentially be released to the atmosphere. The three-dimensional mathematical model of the dissolved gas transport by the ocean currents is used for the quantitative evaluation of the scale of a possible methane flux from the submarine sources. The ocean model is based on the World Ocean Circulation Model designed at the ICM and MG and has been adopted for the domain of North Atlantic and Arctic. The problem was solved numerically on a spatial grid with horizontal spacing 1x1° resolution in the North Atlantic and from 50 to 34 km in the polar region. Vertically, the grid has 33 levels with a higher resolution near the surface.
© В.В. Малахова, Е.Н. Голубева, 2009
