Department Biogeochemical Signals

Department Biogeochemical Signals

Prof. Dr. Sönke Zaehle

Interactions between land eocsystems, atmosphere and the climate system.

The aim of the Biogeochemical Signals Department is to improve our understanding of the interactions between biogeochemical element cycles on land surface and the atmosphere on local, regional and global scales. In addition to the climate-relevant cycles of carbon and water, our research focuses on the essential  nutrients nitrogen (N) and phosphorus (P) and their importance for plant growth, soil dynamics and feedbacks between biospheric processes and climate.

We utilise atmospheric greenhouse gas observations and transport modelling and remote sensing data to to understand regional variations in the terrestrial greenhouse gas balance and identify underlying biospheric signals. We combine knowledge about eco-physiological processes with observations and modelling of biogeochemical cycles at different spatial scales to understand the underlying drivers of these biospheric signals.

We develop complex models to simulate terrestrial biogeochemical element cycles and their dependence on vegetation and soil properties as well as local climate. Based on detailed knowledge of physiological principles of ecosystem processes, we seek to improve these models and adapt them better to capture biological processes at climate relevant scales. We test the improved models with different ecosystem and atmospheric observations. Our new findings also feed into global models of the Earth system to estimate the impact of increasing human influence on terrestrial ecosystems.

 

Latest Key Results

Lacroix, F.,  Zaehle, S.,  Caldararu, S.,  Schaller, J.,  Stimmler, P.,  Holl, D.,  Kutzbach, L., &  Göckede, M. (2022). Mismatch of N release from the permafrost and vegetative uptake opens pathways of increasing nitrous oxide emissions in the high Arctic. Global Change Biology,  00,  1– 18. https://doi.org/10.1111/gcb.16345

Latest Publications

Chawner, H.; Adcock, K. E.; Arnold, T.; Artioli, Y.; Dylag, C.; Forster, G. L.; Ganesan, A.; Graven, H.; Lessin, G.; Levy, P. et al.; Luijx, I. T.; Manning, A.; Pickers, P. A.; Rennick, C.; Rödenbeck, C.; Rigby, M.: Atmospheric oxygen as a tracer for fossil fuel carbon dioxide: a sensitivity study in the UK. Atmospheric Chemistry and Physics 24 (7), pp. 4231 - 4252 (2024)
Flo, V.; Joshi, J.; Sabot, M.; Sandoval, D.; Prentice, I. C.: Incorporating photosynthetic acclimation improves stomatal optimisation models. Plant, Cell and Environment (2024)
Gong, C.; Kou-Giesbrecht, S.; Zaehle, S.: Anthropogenic-driven perturbations on nitrogen cycles and interactions with climate changes. Current Opinion in Green and Sustainable Chemistry 46, 100897 (2024)
Ying, Q.; Poulter, B.; Watts, J. D.; Arndt, K. A.; Virkkala, A.-M.; Bruhwiler, L.; Oh, Y.; Rogers, B. M.; Natali, S. M.; Sullivan, H. et al.; Schiferl, L. D.; Elder, C.; Peltola, O.; Bartsch, A.; Armstrong, A.; Desai, A. R.; Euskirchen, E.; Göckede, M.; Lehner, B.; Nilsson, M. B.; Peichl, M.; Sonnentag, O.; Tuittila, E.-S.; Sachs, T.; Kalhori, A.; Ueyama, M.; Zhang, a. Z.: WetCH4: A machine learning-based upscaling of methane fluxes of northern wetlands during 2016–2022. Earth System Science Data Discussions (2024)
Thurner, M. A.; Caldararu, S.; Engel, J.; Rammig, A.; Zaehle, S.: Modelled forest ecosystem carbon–nitrogen dynamics with integrated mycorrhizal processes under elevated CO2. Biogeosciences 21 (6), pp. 1391 - 1410 (2024)

 

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