12 May 2021

12 May 2021

Review status: this preprint is currently under review for the journal ACP.

Technical Note – AQMEII4 Activity 1: Evaluation of Wet and Dry Deposition Schemes as an Integral Part of Regional-Scale Air Quality Models

Stefano Galmarini1, Paul Makar2, Olivia Clifton3, Christian Hogrefe4, Jesse Bash4, Roberto Bianconi5, Roberto Bellasio5, Johannes Bieser6, Tim Butler7, Jason Ducker8, Johannes Flemming9, Alma Hozdic3, Christopher Holmes7, Ioannis Kioutsioukis10, Richard Kranenburg11, Aurelia Lupascu7, Juan Luis Perez-Camanyo12, Jonathan Pleim4, Young-Hee Ryu13, Roberto San Jose12, Donna Schwede4, Sam Silva14, Marta Garcia Vivanco15, and Ralf Wolke16 Stefano Galmarini et al.
  • 1Joint Research Center, European Commission, Ispra, Italy
  • 2Air Quality Modelling and Integration Section, Environment and Climate Change Canada, Toronto, Canada
  • 3National Center for Atmospheric Research, Boulder, CO, USA
  • 4Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC, USA
  • 5Enviroware srl, Concorezzo, MB, Italy
  • 6Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Germany
  • 7Institute for Advanced Sustainability Studies, Potsdam, Germany
  • 8Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, USA
  • 9European Centre for Medium-Range Weather Forecasts, Reading, U.K.
  • 10Laboratory of Atmospheric Physics, Department of Physics, University of Patras, Greece
  • 11Netherlands Organization for Applied Scientific Research (TNO), Utrecht, The Netherlands
  • 12Technical University of Madrid (UPM), Madrid, Spain
  • 13Pohang University of Science and Technology (POSTECH), Pohang, South Korea
  • 14Pacific Northwest National Laboratory, Richland, WA, USA
  • 15CIEMAT, Madrid, Spain
  • 16Leibniz Institute for Tropospheric Research, Leipzig, Germany

Abstract. We present in this technical note the research protocol for Phase 4 of the Air Quality Model Evaluation International Initiative (AQMEII4). This research initiative is divided in two activities, collectively having three goals: (i) to define the current state of the science with respect to representations of wet and especially dry deposition in regional models, (ii) to quantify the extent to which different dry deposition parameterizations influence retrospective air pollutant concentration and flux predictions, and (iii) to identify, through the use of a common set of detailed diagnostics, sensitivity simulations, model evaluation, and reducing input uncertainty, the specific causes for the current range of these predictions. Activity 1 is dedicated to the diagnostic evaluation of wet and dry deposition processes in regional air quality models (described in this paper), and Activity 2 to the evaluation of dry deposition point models against ozone flux measurements at multiple towers with multiyear observations (Part 2). The scope of these papers is to present the scientific protocols for AQMEII4, as well to summarize the technical information associated with the different dry deposition approaches used by the participating research groups of AQMEII4. In addition to describing all common aspects and data used for this multi-model evaluation activity, most importantly, we present the strategy devised to allow a common process-level comparison of dry deposition obtained from models using sometimes very different dry deposition schemes. The strategy is based on adding detailed diagnostics to the algorithms used in the dry deposition modules of existing regional air quality models, in particular archiving land use/land cover (LULC)-specific diagnostics and creating standardized LULC categories to facilitate cross-comparison of LULC-specific dry deposition parameters and processes, as well as archiving effective conductance and effective flux as means for comparing the relative influence of different pathways towards the net or total dry deposition. This new approach, along with an analysis of precipitation and wet deposition fields, will provide an unprecedented process-oriented comparison of deposition in regional air-quality models. Examples of how specific dry deposition schemes used in participating models have been reduced to the common set of comparable diagnostics defined for AQMEII4 are also presented.

Stefano Galmarini et al.

Status: open (until 14 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-313', Anonymous Referee #1, 24 May 2021 reply
  • RC2: 'Comment on acp-2021-313', Anonymous Referee #2, 16 Jun 2021 reply

Stefano Galmarini et al.

Stefano Galmarini et al.


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Short summary
This technical note presents the research protocols for Phase 4 of the Air Quality Model Evaluation International Initiative (AQMEII4). This initiative has three goals: (i) to define the state of wet and dry deposition in regional models, (ii) to evalute how dry-deposition influences on air concentration and flux predictions, and (iii) to identify the causes for prediction differences. The evaluation compares LULC-specific dry-deposition, as well as effective conductances and fluxes.