Current systematic carbon cycle observations and needs for implementing a policy-relevant carbon observing system

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Author(s) Ciais, P., et al., Gruber, Nicolas
Publication Type Journal Items, Publication Status: Published
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Title Current systematic carbon cycle observations and needs for implementing a policy-relevant carbon observing system
Author(s) Ciais, P.
et al.
Gruber, Nicolas
Journal or Series Title Biogeosciences discussions
Volume Number 10
Issue Number 7
Start Page 11447
End Page 11581
ISSN 1810-6285
Publisher Copernicus
Publication Place Katlenburg-Lindau
Publication Date 2013
Abstract A globally integrated carbon observation and analysis system is needed to improve the fundamental understanding of the global carbon cycle, to improve our ability to project future changes, and to verify the effectiveness of policies aiming to reduce greenhouse gas emissions and increase carbon sequestration. Building an integrated carbon observation system requires transformational advances from the existing sparse, exploratory framework towards a dense, robust, and sustained system in all components: anthropogenic emissions, the atmosphere, the ocean, and the terrestrial biosphere. The goal of this study is to identify the current state of carbon observations and needs for a global integrated carbon observation system that can be built in the next decade. A key conclusion is the substantial expansion (by several orders of magnitude) of the ground-based observation networks required to reach the high spatial resolution for CO2 and CH4 fluxes, and for carbon stocks for addressing policy relevant objectives, and attributing flux changes to underlying processes in each region. In order to establish flux and stock diagnostics over remote areas such as the southern oceans, tropical forests and the Arctic, in situ observations will have to be complemented with remote-sensing measurements. Remote sensing offers the advantage of dense spatial coverage and frequent revisit. A key challenge is to bring remote sensing measurements to a level of long-term consistency and accuracy so that they can be efficiently combined in models to reduce uncertainties, in synergy with ground-based data. Bringing tight observational constraints on fossil fuel and land use change emissions will be the biggest challenge for deployment of a policy-relevant integrated carbon observation system. This will require in-situ and remotely sensed data at much higher resolution and density than currently achieved for natural fluxes, although over a small land area (cities, industrial sites, power plants), as well as the inclusion of fossil fuel CO2 proxy measurements such as radiocarbon in CO2 and carbon-fuel combustion tracers. Additionally, a policy relevant carbon monitoring system should also provide mechanisms for reconciling regional top-down (atmosphere-based) and bottom-up (surface-based) flux estimates across the range of spatial and temporal scales relevant to mitigation policies. The success of the system will rely on long-term commitments to monitoring, on improved international collaboration to fill gaps in the current observations, on sustained efforts to improve access to the different data streams and make databases inter-operable, and on the calibration of each component of the system to agreed-upon international scales.
DOI 10.5194/bgd-10-11447-2013
Additional Notes Received 6 May 2013, Accepted 7 May 2013, Published 10 July 2013
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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Source Database ID FORM-1390473526
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  author = "Ciais, P. and et al. and Gruber, Nicolas",
  title = "{C}urrent systematic carbon cycle observations and needs for implementing a policy-relevant carbon observing system",
  journal = "Biogeosciences discussions",
  year = 2013,
  volume = "10",
  number = "7",
  pages = "11447--11581",

E-Citations record created: Thu, 23 Jan 2014, 10:38:57 CET