Scientific and logistical coordination
Work package 1 attends to all regards of scientific content, scheduling, and logistical requirements. The work package is subdivided into two sub-packages.
The Institute of Soil Science at the University of Hamburg will coordinate all scientific issues and harmonize German and Russian efforts. Additionally, all findings and generated data sets will be collected and published in PANGAEA, an Open Access data library for earth system research.
The logistical and technical tasks necessary for the planned expeditions to Siberia will be managed by the Alfred Wegener Institute in Potsdam. Furthermore, permafrost samples and cores collected during the expeditions will be documented and archived by the Alfred Wegener Institute.
Goals and milestones:
- Planning and execution of project and work group meetings
- Furtherance of young researchers and early career scientists
- Strengthening of the scientific and technological cooperation (STC) with Russia
- Coordination and execution of expeditions and field work
- Data management and archiving of permafrost samples
- Public relations
© J. Walz: Provisions for the research station on Samoylov Island
- Prof. Dr. Eva-Maria Pfeiffer (Universität Hamburg)
- Prof. Dr. Guido Grosse (Alfred Wegener Institute Potsdam)
- Dr. Tim Eckhardt (Universität Hamburg)
- Prof. Dr. Dmitry Yu. Bolshiyanov (Saint Petersburg State University and Arctic and Antarctic Research Institute)
- Dr. Irina V. Fedorova (Saint Petersburg State University and Otto Schmidt Laboratory)
- Dr. Mikhail N. Grigoriev (Melnikov Permafrost Institute of Siberian Branch of Russian Academy of Sciences in Yakutsk)
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)