EGU2020-16019
https://doi.org/10.5194/egusphere-egu2020-16019
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Temporal variations of CH4/CO2/CO fluxes in the central Amazon rainforest

Shujiro Komiya1, Jost Lavric1, David Walter1,2, Santiago Botia1, Alessandro Araujo3,4, Marta Sá3, Matthias Sörgel2, Stefan Wolff2, Hella Asperen5, Fumiyoshi Kondo6, and Susan Trumbore1
Shujiro Komiya et al.
  • 1Max Planck Institute for Biogeochemistry, Jena, Germany (skomiya@bgc-jena.mpg.de)
  • 2Max Planck Institute for Chemistry, Mainz, Germany
  • 3Instituto Nacional de Pesquisas da Amazônia (INPA) · Large Scale Biosphere-Atmosphere Experiment in Amazonia (LBA), Manaus, Brazil
  • 4Brazilian Agricultural Research Corporation (EMBRAPA) · Embrapa Amazônia Oriental, Belém, Brazil
  • 5Institute for Environmental Physics (IUP), University of Bremen, Bremen, Germany
  • 6Japan Coast Guard Academy, Kure, Japan

Amazon rainforests and soils contain large amounts of carbon, which is under pressure from ongoing climate and land use change in the Amazon basin. It is estimated that methane (CH4), an important greenhouse gas, is largely released from the flooded wetlands of the Amazon, but the trends and balances of CH4 in the Amazon rainforest are not yet well understood. In addition, the change in atmospheric CH4 concentration is strongly associated with a change in carbon monoxide (CO) concentration, often caused by the human-induced combustion of biomass that usually peaks during dry season. Understanding the long-term fluctuations in the fluxes of greenhouse gases in the Amazon rainforest is essential for improving our understanding of the carbon balance of the Amazon rainforest.

Since March 2012, we have continuously measured atmospheric CO2/CH4/CO concentrations at five levels (79, 53, 38, 24, and 4 m a.g.l.) using two wavelength-scanned cavity ring-down spectroscopy analyzers (G1301 and G1302, Picarro Inc., USA), which are automatically calibrated on site every day. In addition, we measured the CO2 flux by the eddy covariance method at the same tower. We estimated the CO2/CH4/CO fluxes by combining the vertical profile of the CO2/CH4/CO concentrations with the flux gradient method. Our results generally show no major difference in CO2 flux between the wet and dry seasons except for year 2017, when an elevated CO2 uptake was documented during the dry season despite the lowest precipitation between 2014 and 2018. The CH4 flux showed the largest CH4 emission during the dry season in year 2016. Further results will be analyzed and discussed in the presentation.

How to cite: Komiya, S., Lavric, J., Walter, D., Botia, S., Araujo, A., Sá, M., Sörgel, M., Wolff, S., Asperen, H., Kondo, F., and Trumbore, S.: Temporal variations of CH4/CO2/CO fluxes in the central Amazon rainforest, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-16019, https://doi.org/10.5194/egusphere-egu2020-16019, 2020

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