Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 2881-2899, 2017
https://doi.org/10.5194/acp-17-2881-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
24 Feb 2017
Impact of Siberian observations on the optimization of surface CO2 flux
Jinwoong Kim1,a, Hyun Mee Kim1, Chun-Ho Cho2, Kyung-On Boo2, Andrew R. Jacobson3,4, Motoki Sasakawa5, Toshinobu Machida5, Mikhail Arshinov6, and Nikolay Fedoseev7 1Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
2National Institute of Meteorological Sciences, Jeju, South Korea
3Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
4Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
5Center for Global Environmental Research, National Institute for Environment Studies, Tsukuba, Japan
6V. E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, Tomsk, Russia
7Melnikov Permafrost Institute, Russian Academy of Sciences, Yakutsk, Russia
acurrently at: Climate Research Division, Environment and Climate Change Canada, Toronto, Canada
Abstract. To investigate the effect of additional CO2 observations in the Siberia region on the Asian and global surface CO2 flux analyses, two experiments using different observation data sets were performed for 2000–2009. One experiment was conducted using a data set that includes additional observations of Siberian tower measurements (Japan-Russia Siberian Tall Tower Inland Observation Network: JR-STATION), and the other experiment was conducted using a data set without the above additional observations. The results show that the global balance of the sources and sinks of surface CO2 fluxes was maintained for both experiments with and without the additional observations. While the magnitude of the optimized surface CO2 flux uptake and flux uncertainty in Siberia decreased from −1.17 ± 0.93 to −0.77 ± 0.70 Pg C yr−1, the magnitude of the optimized surface CO2 flux uptake in the other regions (e.g., Europe) of the Northern Hemisphere (NH) land increased for the experiment with the additional observations, which affect the longitudinal distribution of the total NH sinks. This change was mostly caused by changes in the magnitudes of surface CO2 flux in June and July. The observation impact measured by uncertainty reduction and self-sensitivity tests shows that additional observations provide useful information on the estimated surface CO2 flux. The average uncertainty reduction of the conifer forest of Eurasian boreal (EB) is 29.1 % and the average self-sensitivities at the JR-STATION sites are approximately 60 % larger than those at the towers in North America. It is expected that the Siberian observations play an important role in estimating surface CO2 flux in the NH land (e.g., Siberia and Europe) in the future.

Citation: Kim, J., Kim, H. M., Cho, C.-H., Boo, K.-O., Jacobson, A. R., Sasakawa, M., Machida, T., Arshinov, M., and Fedoseev, N.: Impact of Siberian observations on the optimization of surface CO2 flux, Atmos. Chem. Phys., 17, 2881-2899, https://doi.org/10.5194/acp-17-2881-2017, 2017.
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Short summary
To investigate the effect of CO2 observations in Siberia on the surface CO2 flux analyses, two experiments using observation data sets with and without Siberian measurements were performed. While the magnitude of the optimized surface CO2 flux uptake in Siberia decreased, that in the other regions of the Northern Hemisphere increased for the experiment with Siberian observations. It is expected that the Siberian observations play an important role in estimating surface CO2 flux in the future.
To investigate the effect of CO2 observations in Siberia on the surface CO2 flux analyses, two...
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