Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 18, 7913-7931, 2018
https://doi.org/10.5194/acp-18-7913-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
06 Jun 2018
Global soil consumption of atmospheric carbon monoxide: an analysis using a process-based biogeochemistry model
Licheng Liu1, Qianlai Zhuang1,2, Qing Zhu1,3, Shaoqing Liu1,4, Hella van Asperen5, and Mari Pihlatie6,7 1Department of Earth, Atmospheric, Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA
2Department of Agronomy, Purdue University, West Lafayette, IN 47907, USA
3Climate Sciences Department, Climate & Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
4Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USA
5Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, Bremen 28359, Germany
6Department of Physics, University of Helsinki, P.O. Box 48, 00014 University of Helsinki, Finland
7Department of Forest Sciences, P.O. Box 27, 00014 University of Helsinki, Finland
Abstract. Carbon monoxide (CO) plays an important role in controlling the oxidizing capacity of the atmosphere by reacting with OH radicals that affect atmospheric methane (CH4) dynamics. We develop a process-based biogeochemistry model to quantify the CO exchange between soils and the atmosphere with a 5 min internal time step at the global scale. The model is parameterized using the CO flux data from the field and laboratory experiments for 11 representative ecosystem types. The model is then extrapolated to global terrestrial ecosystems using monthly climate forcing data. Global soil gross consumption, gross production, and net flux of the atmospheric CO are estimated to be from −197 to −180, 34 to 36, and −163 to −145 Tg CO yr−1 (1 Tg  =  1012 g), respectively, when the model is driven with satellite-based atmospheric CO concentration data during 2000–2013. Tropical evergreen forest, savanna and deciduous forest areas are the largest sinks at 123 Tg CO yr−1. The soil CO gross consumption is sensitive to air temperature and atmospheric CO concentration, while the gross production is sensitive to soil organic carbon (SOC) stock and air temperature. By assuming that the spatially distributed atmospheric CO concentrations ( ∼  128 ppbv) are not changing over time, the global mean CO net deposition velocity is estimated to be 0.16–0.19 mm s−1 during the 20th century. Under the future climate scenarios, the CO deposition velocity will increase at a rate of 0.0002–0.0013 mm s−1 yr−1 during 2014–2100, reaching 0.20–0.30 mm s−1 by the end of the 21st century, primarily due to the increasing temperature. Areas near the Equator, the eastern US, Europe and eastern Asia will be the largest sinks due to optimum soil moisture and high temperature. The annual global soil net flux of atmospheric CO is primarily controlled by air temperature, soil temperature, SOC and atmospheric CO concentrations, while its monthly variation is mainly determined by air temperature, precipitation, soil temperature and soil moisture.
Citation: Liu, L., Zhuang, Q., Zhu, Q., Liu, S., van Asperen, H., and Pihlatie, M.: Global soil consumption of atmospheric carbon monoxide: an analysis using a process-based biogeochemistry model, Atmos. Chem. Phys., 18, 7913-7931, https://doi.org/10.5194/acp-18-7913-2018, 2018.
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Short summary
carbon monoxide (CO) plays an important role in atmosphere. We developed a model to quantify soil CO exchanges with the atmosphere. The simulation is conducted for various ecosystems on a global scale during the 20th and 21st centuries. We found that areas near the Equator, the eastern US, Europe and eastern Asia are the largest sinks due to optimum soil moisture and high temperature. This study will benefit the modeling of the global climate and atmospheric chemistry.
carbon monoxide (CO) plays an important role in atmosphere. We developed a model to quantify...
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