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Preprints
https://doi.org/10.5194/acp-2020-729
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-729
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Aug 2020

21 Aug 2020

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This preprint is currently under review for the journal ACP.

Overview: The CLoud-Aerosol-Radiation Interaction and Forcing: Year-2017 (CLARIFY-2017) measurement campaign

Jim M. Haywood1,2, Steven J. Abel2, Paul A. Barrett2, Nicolas Bellouin3, Alan Blyth4, Keith N. Bower5, Melissa Brooks2, Ken Carslaw4, Haochi Che5,6, Hugh Coe7, Michael I. Cotterell1,8, Ian Crawford7, Zhiqiang Cui4, Nicholas Davies1,9, Beth Dingley1,5, Paul Field2,4, Paola Formenti10, Hamish Gordon4,11, Martin de Graaf12, Ross Herbert3, Ben Johnson2, Anthony C. Jones1,2, Justin M. Langridge2, Florent Malavelle1,2, Daniel G. Partridge1, Fanny Peers1, Jens Redemann13, Philip Stier5, Kate Szpek2, Jonathan W. Taylor7, Duncan Watson-Parris5, Robert Wood14, Huihui Wu7, and Paquita Zuidema15 Jim M. Haywood et al.
  • 1College of Engineering, Mathematics and Physical Science, University of Exeter, Exeter, UK, EX4 4QE
  • 2Met Office, Exeter, UK, EX1 3PB
  • 3Dept. of Meteorology, University of Reading, UK, RG6 6BB
  • 4School of Earth and Environment, University of Leeds, UK, LS2 9JT
  • 5Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, UK, OX1 3PU
  • 6now at: Tel Aviv University, Tel Aviv, Israel
  • 7Department of Earth and Environmental Sciences, University of Manchester, M13 9PL, UK
  • 8now at: School of Chemistry, University of Bristol, Bristol, UK, BS8 1TS
  • 9now at: Haseltine Lake Kempner, Bristol, UK, BS1 6HU
  • 10LISA, UMR CNRS 7583, Université Paris-Est-Créteil, Université de Paris, Institut Pierre Simon Laplace (IPSL), Créteil, France
  • 11now at: Engineering Research Accelerator, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
  • 12KNMI, the Netherlands
  • 13University of Oklahoma, Oklahoma, USA
  • 14University of Washington, Washington, USA
  • 15Rosenstiel School of Marine and Atmospheric Science, University of Miami, Florida, USA

Abstract. The representation of clouds, aerosols and cloud-aerosol-radiation impacts remain some of the largest uncertainties in climate change, limiting our ability to accurately reconstruct and predict future climate. The south-east Atlantic is a region where high atmospheric aerosol loadings and semi-permanent stratocumulus clouds are co-located, providing a natural laboratory for studying the full range of aerosol-radiation and aerosol-cloud interactions and their perturbations of the Earth’s radiation budget. While satellite measurements have provided some useful insights into aerosol-radiation and aerosol cloud interactions over the region, these observations do not have the spatial and temporal resolution, nor the required level of precision to allow for a process level assessment. Detailed measurements from high spatial and temporal resolution airborne atmospheric measurements in the region are very sparse, limiting their use in assessing the performance of aerosol modelling in numerical weather prediction and climate models. CLARIFY-2017 was a major consortium programme consisting of 5 principal UK universities with project partners from the UK Met Office and European and USA-based universities and research centres involved in the complementary ORACLES, LASIC and AEROCLO-sA projects. The aims of CLARIFY-2017 were four-fold; (1) to improve the representation and reduce uncertainty in model estimates of the direct, semi-direct and indirect radiative effect of absorbing biomass burning aerosols; (2) improve our knowledge and representation of the processes determining stratocumulus cloud microphysical and radiative properties and their transition to cumulus regimes; (3) challenge, validate and improve satellite retrievals of cloud and aerosol properties and their radiative impacts; (4) improve numerical models of cloud and aerosol and their impacts on radiation, weather and climate. This paper describes the modelling and measurement strategies central to the CLARIFY-2017 deployment of the FAAM BAe146 instrumented aircraft campaign, summarises the flight objectives and flight patterns, and highlights some key results from our initial analyses.

Jim M. Haywood et al.

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Short summary
Every year, the seasonal cycle of biomass burning from agricultural practices in Africa creates a huge plume of smoke that travels many thousands of kilometres over the Atlantic Ocean. This study provides an overview of a measurement campaign called the CLoud-Aerosol-Radiation Interaction and Forcing: Year 2017 (CLARIFY-2017) and documents the rationale, deployment strategy, observations and key results from the campaign which utilised the heavily equipped FAAM atmospheric research aircraft.
Every year, the seasonal cycle of biomass burning from agricultural practices in Africa creates...
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