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Carbon gas flux to and from inland waters: support for a global observation network

  • Special Feature: Review Article
  • Material transport and cycle in watersheds
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Abstract

Research on carbon gas flux to and from inland waters has increased over the past two decades, driven mainly by the need to understand (1) the global carbon budget in regard to stabilizing earth’s climate, and (2) how aquatic ecosystems and the services they provide change in response to anthropogenic pressures like climate and land use change. This paper reviews carbon flux research in support of a proposed global carbon monitoring network to inform public policy. It begins with an overview of the physical–chemical processes and quantification tools for carbon gas flux, and then highlights their application to streams, rivers, lakes, reservoirs and estuaries. Research outcomes to date point to spatiotemporal coverage gaps owing to the complexity of the aquatic ecosystems and land–water interactions, suggesting that long-term monitoring is needed to better understand their signals in response to changes in climate and land management. While better monitoring of gas flux is an important piece of the global carbon budget resolution problem, new information will need to be developed and integrated to adequately inform carbon policymaking. This information can stem from developments in large-scale carbon status and flux assessment tools, such as via remote sensing platforms, and from improved integrated watershed-to-water body modeling efforts.

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Fig. 1
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taken from Raymond et al. (2012) Table 2, model 4. Stream flow values shown in the legend are averages for the date based on local gauging station reports (cms cubic meter per second)

Fig. 4

adapted from Kuhn et al. 2017)

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Fig. 6

adapted from Marcé et al. 2019) Reservoir locations are Spain (Sau, Boadella, Undarrage) and Germany

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Acknowledgements

This paper was supported by Research Institute for Humanity and Nature (Project No. D06-14200119) and by the University of California Merced.

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Correspondence to Thomas C. Harmon.

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Harmon, T.C. Carbon gas flux to and from inland waters: support for a global observation network. Limnology 21, 429–442 (2020). https://doi.org/10.1007/s10201-020-00623-1

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  • DOI: https://doi.org/10.1007/s10201-020-00623-1

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