Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 235-256, 2017
https://doi.org/10.5194/acp-17-235-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Review article
04 Jan 2017
Global inverse modeling of CH4 sources and sinks: an overview of methods
Sander Houweling1,2, Peter Bergamaschi3, Frederic Chevallier4, Martin Heimann5, Thomas Kaminski6, Maarten Krol1,2,7, Anna M. Michalak8, and Prabir Patra9 1SRON Netherlands Institute for Space Research, Utrecht, the Netherlands
2Institute for Marine and Atmospheric Research (IMAU), Utrecht University, Utrecht, the Netherlands
3European Commission Joint Research Centre, Institute for Environment and Sustainability, Ispra (Va), Italy
4Le Laboratoire des Sciences du Climat et l'Environnement (LSCE), Gif-Sur-Yvette, France
5Max-Planck-Institute for Biogeochemistry, Jena, Germany
6The Inversion Lab, Hamburg, Germany
7Department of Meteorology and Air Quality (MAQ), Wageningen University and Research Centre, Wageningen, the Netherlands
8Department of Global Ecology, Carnegie Institution for Science, Stanford, USA
9Japanese Agency for Marine-Earth Science and Technology, Yokohama, Japan
Abstract. The aim of this paper is to present an overview of inverse modeling methods that have been developed over the years for estimating the global sources and sinks of CH4. It provides insight into how techniques and estimates have evolved over time and what the remaining shortcomings are. As such, it serves a didactical purpose of introducing apprentices to the field, but it also takes stock of developments so far and reflects on promising new directions. The main focus is on methodological aspects that are particularly relevant for CH4, such as its atmospheric oxidation, the use of methane isotopologues, and specific challenges in atmospheric transport modeling of CH4. The use of satellite retrievals receives special attention as it is an active field of methodological development, with special requirements on the sampling of the model and the treatment of data uncertainty. Regional scale flux estimation and attribution is still a grand challenge, which calls for new methods capable of combining information from multiple data streams of different measured parameters. A process model representation of sources and sinks in atmospheric transport inversion schemes allows the integrated use of such data. These new developments are needed not only to improve our understanding of the main processes driving the observed global trend but also to support international efforts to reduce greenhouse gas emissions.

Citation: Houweling, S., Bergamaschi, P., Chevallier, F., Heimann, M., Kaminski, T., Krol, M., Michalak, A. M., and Patra, P.: Global inverse modeling of CH4 sources and sinks: an overview of methods, Atmos. Chem. Phys., 17, 235-256, https://doi.org/10.5194/acp-17-235-2017, 2017.
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The aim of this paper is to present an overview of inverse modeling methods, developed over the years, for estimating the global sources and sinks of the greenhouse gas methane from atmospheric measurements. It provides insight into how techniques and estimates have evolved over time, what the remaining shortcomings are, new developments, and promising future directions.
The aim of this paper is to present an overview of inverse modeling methods, developed over the...
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