The effect of the Siberian tundra on the environment of the shelf seas and the Arctic Ocean

Article Abstract:

The effects the Siberian tundra and its rivers have on the environment of the seas of the Siberian shelf and the Arctic Ocean have been studied as part of the Tundra Ecology -94 expedition. Inflow of inorganic and organic carbon was investigated. The transformation of the carbon forms by biochemical processes were investigated. Anthropogenic radionuclides were studied in water and sediments. The distribution of dissolved inorganic carbon shows the majority of the Yenisey and Ob outflow goes into the Laptev Sea and then to the Arctic Ocean. Even close to mouths of large rivers, benthic fluxes are low vs coastal areas of the North Sea region where human activities have a larger effect. A significant part of the radioisotopes found come from water from the Atlantic Ocean.

North Sea, Europe, Cesium, Isotopes, Siberia, Arctic Ocean, Barents Sea, Chernobyl, Ukraine, Coastal ecology, Kara Sea

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Carbon cycling and methane exchange in Eurasian tundra ecosystems

Article Abstract:

Methane exchange and carbon cycling have been studied in northern Eurasia tundra ecosystems. Actual and potential trace gas exchanges were studied by the Swedish-Russian Tundra-Ecology -94 expedition. Net uptake of atmospheric carbon dioxide was found to correlate with simple climatic parameters, among them mean July temperature and annual precipitation. Release of carbon through ecosystem respiration is controlled by climate to a great degree. Methane emissions in typical habitats were slightly lower than for similar North American habitats, likely because temperatures were lower in the Russian area than in the North American one. An overview of data and results is presented.

Methane, Eurasia, Carbon cycle (Biogeochemistry), Carbon cycle

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