EGU21-1816
https://doi.org/10.5194/egusphere-egu21-1816
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Reconciling the carbon balance of northern Scandinavia through the integration of observations and modelling

Anusha Sathyanadh1, Guillaume Monteil2, Marko Scholze2, Anne Klosterhalfen1, Hjalmar Laudon1, Zhendong Wu2, Christoph Gerbig3, Erik van Schaik4, Vladislav Bastrikov5, Mats B. Nilsson1, and Matthias Peichl1
Anusha Sathyanadh et al.
  • 1Swedish University of Agricultural Sciences, Dept of Forest Ecology and Management, India (anusha.sathyanadh@slu.se)
  • 22Dep. of Physical Geography and Ecosystem Science, Lund University, Sweden
  • 3Max Planck Institute for Biogeochemistry, Jena, Germany
  • 4Meteorology and Air Quality, Wageningen University and Research, Wageningen, The Netherlands
  • 5Laboratoire des Sciences du Climat et de l’Environnement, Institut Pierre-Simon Laplace, CEA-CNRS-UVSQ, CE Orme des Merisiers, 91191 Gif-sur-Yvette CEDEX, France

The boreal biome is an important component of the global carbon (C) cycle. However, current estimates of its sink-source strength at regional scales and its responses to climate change rely primarily on models and thus remain uncertain. We investigated the C balance over a north Scandinavian boreal region by integrating observations of land-atmosphere fluxes and atmospheric CO2 concentrations at landscape to regional scales. We also placed a special focus to understand the impact of 2018 drought on the region. Flux estimates can be obtained through various techniques such as in-situ flux measurements, eddy covariance (EC) observations, vegetation modelling and inverse modelling of CO2 observations. These techniques are however typically relevant at very different spatial scales ranging from plot scale to country-scale, which makes it difficult to compare them. The -Svartberget site (SVB), an established ICOS (Integrated Carbon Observation System) station in Northern Sweden offers a unique range of observations, from in-situ flux measurements to EC fluxes and tall-tower concentration measurements. Here we used several vegetation models and an atmospheric transport model to connect the different scales for the period 2016-2018. The land-atmosphere carbon fluxes are from four different vegetation models (VPRM, LPJ-GUESS, ORCHIDEE and SiBCASA) and are used in the LUMIA/FLEXPART atmospheric transport model (Lund University Modular Inversion Algorithm) to generate estimates of atmospheric CO2 concentration. We found that the northern Sweden region remained as a C sink for the study period with models differed in sink strength. It was also noticed that the site SVB can be taken as a representative for the northern Sweden region. All models indicate similar but small reductions in the net CO2 uptake for the drought year 2018 in northern Sweden except LPJ-GUESS that reveal limitations which call for further model improvement. Our work highlights the interest of using combined ecosystem,-atmosphere ICOS sites such as SVB in the Scandinavian region and shows that it is a promising way forward to monitor CO2 fluxes at the regional scale.

How to cite: Sathyanadh, A., Monteil, G., Scholze, M., Klosterhalfen, A., Laudon, H., Wu, Z., Gerbig, C., Schaik, E. V., Bastrikov, V., Nilsson, M. B., and Peichl, M.: Reconciling the carbon balance of northern Scandinavia through the integration of observations and modelling, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1816, https://doi.org/10.5194/egusphere-egu21-1816, 2021.

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