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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Feb 2018

Research article | 16 Feb 2018

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This discussion paper is a preprint. A revision of the manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP).

A measurement-based verification framework for UK greenhouse gas emissions: an overview of the Greenhouse gAs Uk and Global Emissions (GAUGE) project

Paul I. Palmer1, Simon O'Doherty2, Grant Allen3, Keith Bower3, Hartmut Bösch4, Martyn P. Chipperfield5, Sarah Connors7, Sandip Dhomse6, Liang Feng1,8, Douglas P. Finch1, Martin W. Gallagher3, Emanuel Gloor6, Siegfried Gonzi1,9, Neil R. P. Harris10, Carole Helfter11, Neil Humpage4, Brian Kerridge12,13, Diane Knappett12,13, Roderic L. Jones7, Michael Le Breton3,14, Mark F. Lunt2, Alistair J. Manning15, Stephan Matthiesen1, Jennifer B. A. Muller3,16, Neil Mullinger11, Eiko Nemiitz11, Sebastian O'Shea3, Robert J. Parker4, Carl J. Percival3,17, Joseph Pitt3, Stuart N. Riddick7, Matthew Rigby2, Harjinder Sembhi4, Richard Siddans12,13, Robert L. Skelton7, Paul Smith7,18, Hannah Sonderfeld4, Kieron Stanley2, Ann R. Stavert2, Angelina Wenger2, Emily White2, Christopher Wilson5,19, and Dickon Young2 Paul I. Palmer et al.
  • 1School of GeoSciences, University of Edinburgh, UK
  • 2School of Chemistry, University of Bristol, UK
  • 3Centre for Atmospheric Science, The University of Manchester, Manchester, UK
  • 4Earth Observation Science Group, Department of Physics and Astronomy, University of Leicester, Leicester, UK
  • 5School of Earth and Environment, University of Leeds, Leeds, UK
  • 6School of Geography, University of Leeds, Leeds, UK
  • 7Centre for Atmospheric Science, University of Cambridge, Cambridge, UK
  • 8National Centre for Earth Observation, University of Edinburgh, UK
  • 9now at: Met Office, Exeter, UK
  • 10Centre for Environmental and Agricultural Informatics, Cranfield University, Cranfield, UK
  • 11Centre for Ecology and Hydrology, Penicuik, UK
  • 12Space Science and Technology Department, Rutherford Appleton Laboratory, Oxfordshire, UK
  • 13National Centre for Earth Observation, Rutherford Appleton Laboratory, UK
  • 14now at: Department of Chemistry & Molecular Biology, University of Gothenburg, Gothenburg, Sweden
  • 15Met Office, Exeter, UK
  • 16now at: Deutscher Wetterdienst, Meteorologisches Observatorium Hohenpeißenberg, Hohenpeißenberg, Germany
  • 17now at: Jet Propulsion Laboratory, Pasadena, CA, USA
  • 18now at: Institute of Physical Chemistry Rocasolano, Madrid, Spain
  • 19National Centre for Earth Observation, University of Leeds, UK

Abstract. We describe the motivation, design, and execution of the Greenhouse gAs Uk and Global Emissions (GAUGE) project. The overarching scientific objective of GAUGE was to use atmospheric data to estimate the magnitude, distribution, and uncertainty of the UK greenhouse gas (GHG, defined here as CO2, CH4, and N2O) budget, 2013–2015. To address this objective we established a multi-year and interlinked measurement and data analysis programme, building on an established tall tower GHG measurement network. The inter-calibrated measurement network comprises ground-based, airborne, ship-borne, balloon-borne, and space-borne GHG sensors. Our choice of measurement technologies and measurement locations reflects the heterogeneity of UK GHG sources that range from small point sources such as landfills to large, diffuse sources such as agriculture. Atmospheric mole fraction data collected at the tall towers and on the ships provide information on sub-continental fluxes, representing the backbone to the GAUGE network. Additional spatial and temporal details of GHG fluxes over East Anglia were inferred from data collected by a regional network. Data collected during aircraft flights were used to study the transport of GHGs on local and regional scales. We purposely integrated new sensor and platform technologies into the GAUGE network, allowing us to lay the foundations of a strengthened UK capability to verify national GHG emissions beyond the project lifetime. For example, current satellites provide sparse and seasonally uneven sampling over the UK mainly because of its geographical size and cloud cover. This situation will improve with new and future satellite instruments, e.g. measurements of CH4 from the TROPOMI instrument aboard Sentinel-5P. We use global, nested, and regional atmospheric transport models and inverse methods to infer geographically resolved CO2 and CH4 fluxes. This multi-model approach allows us to study model spread in a posteriori flux estimates. These models are used to determine the relative importance of different measurements to infer the UK GHG budget. Attributing observed GHG variations to specific sources is a major challenge. Within a UK-wide spatial context we used two approaches: 1) Δ14CO2 and other relevant isotopologues (e.g. δ13CCH4) from collected air samples to quantify the contribution from fossil fuel combustion and other sources; 2) geographical separation of individual sources, e.g. agriculture, using a high-density measurement network. Neither of these represents a definitive approach, but they will provide invaluable information about GHG source attribution when they are adopted as part of a more comprehensive, long-term national GHG measurement programme. We also conducted a number of case studies, including an instrumented landfill experiment that provided a test-bed for new technologies and flux estimation methods. We anticipate that results from the GAUGE project will help inform other countries on how to use atmospheric data to quantify their nationally determined contributions to the Paris Agreement.

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Short summary
This paper provides an overview of the Greenhouse gAs Uk and Global Emissions (GAUGE) experiment. GAUGE was designed to quantify nationwide GHG emissions of the UK, bringing together measurements and atmospheric transport models. This novel experiment is the first of its kind. We anticipate it will inform the blueprint for countries that are building a measurement infrastructure in preparation for global stock takes, which are a key part of the Paris Agreement.
This paper provides an overview of the Greenhouse gAs Uk and Global Emissions (GAUGE)...