Abstract
Arctic tundra ecosystems have experienced strong warming in recent decades, which is affecting their exchange of the greenhouse gases methane (CH4) and carbon dioxide (CO2). The impact that these changes could have on global climate is currently not well known, partly because the scarcity of direct, continuous and comparable gas flux measurements hinders the reliable parametrization of the involved processes.
This talk presents CH4 and CO2 flux measurements from two permafrost-underlain wetlands in Adventdalen, Svalbard, and Zackenberg, NE Greenland, and discusses different concepts of trace gas exchange throughout the different seasons. These include, among others, large CH4 emissions during the autumnal freeze-in period, the cold season's snowpack gas storage and emission, and the effect of ice-wedge degradation on CO2 sinks in polygonal tundra.
About the speaker:
Norbert Pirk is a Doctoral student at Dept of Physical Geography and Ecosystem Science, Lund University, Sweden.
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The seminar is open for all interested in the topic of the seminar.