Trace Gas Budget

The greenhouse effect, that is, the warming of the troposphere and the Earth's surface through the absorption of infrared radiation by greenhouse gases, plays a major role in climate variability and change. Exchange processes in the marine and terrestrial ecosystems of the Arctic significantly influence global greenhouse gas concentrations. Perturbations in Arctic climate will influence these processes and may lead to regime shifts with respect to the role of the Arctic as a source or a sink for greenhouse gases. A rise in ground temperatures leads to processes (e.g., enhanced microbial activity in peat land deposits) that may result in substantial release of carbon and/or carbon dioxide into the atmosphere, thus initiating feedbacks and further warming. Although poorly understood, these feedback processes will have repercussions beyond the Arctic and may influence global climate at large (AMAP, 1998).

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