The project is coordinated by the Institute of Soil Science at Universität Hamburg. The project director and speaker is:
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Book of abstracts
Reports on polar and marine research "Focus Siberian Permafrost – Terrestrial Cryosphere and Climate Change" International Online Symposium, Institute of Soil Science, Universität Hamburg, 24 – 25 March 2021 (Pfeiffer, Eva-Maria, Vybornova, Olga, Kutzbach, Lars, Fedorova, Irina, Knoblauch, Christian, Tsibizov, Leonid and Beer, Christian).
The overall objective was to assess the combination of Landsat and Sentinel-2 data in a mosaic workflow to create good quality annual mosaics for the growing season (July and August) as input for high temporal time series assessments in northern high permafrost latitudes. The combined Landsat and Sentinel-2 input database for mosaics reliably improves the mosaic results without data-gaps. Especially northern, coastal sites often affected by poor cloud conditions benefit from the combined Landsat+Sentinel-2 approach. This work lays the ground for effective and detailed spatio-temporal monitoring and quantification of disturbance dynamics such as thaw slumps and their potential carbon fluxes. (Runge and Grosse, 2020, Remote Sensing).
The decomposition of eddy covariance-based CO2 fluxes into respiration and photosynthesis was not only applied for the overall footprint as commonly carried out, but instead for each of two vegetation classes. In this way, a differing seasonality in the net uptakes of bushes and sedges could be unveiled. Therefore, the flux decomposition proved to be a useful tool for gaining insights into both the phenological dynamic of individual vegetation classes, plus their respective functional flux to flux driver relationships with the aid of ecophysiologically interpretable parameters (Rößger et al., 2019, Biogeosciences Discuss).
20 Years Lena Expedition
German and Russian scientists, technicians, and students will meet in Saint Petersburg from October 17-19 to celebrate 20 years of successful cooperation in the Lena River Delta and Laptev Sea region. Future expeditions and joint research strategies will also be discussed. The meeting is organized by the Arctic and Antarctic Research Institute in Saint Petersburg, the Alfred Wegener Institute in Potsdam, the Melnikov Permafrost Institute in Yakutsk, and the Institute of Soil Science in Hamburg.
© T. Eckhardt: The "old" research station on Samoylov Island
Partitioning of CO2 net ecosystem exchange on the microsite scale in the Lena River Delta shows that both polygon centers and polygon rims were sinks for atmospheric CO2 during a growing season, but the sink strengths varied between the two microsites. Furthermore, it was shown that autotrophic and heterotrophic respiration fluxes react differently to changing hydrologic conditions (Eckhardt et al. Biogeoscience Discuss. 2018)
Greenhouse gas production in degrading ice-rich permafrost deposits in northeast Siberia depends on the climate conditions during deposition. Late Pleistocene Yedoma deposits generally produced more CO2 than Holocene deposits. Thus, organic matter decomposability needs to be interpreted against the paleo-environmental background. However, organic matter decomposability cannot be generalized solely based on the stratigraphic position (Walz et al. Biogeoscience 2018)