Climate processes

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Identifying climate model structural inconsistencies allows for tight constraint of aerosol radiative forcing

Authors:

Leighton A Regayre, Lucia Deaconu, Daniel P Grosvenor, David MH Sexton, Christopher Symonds, Tom Langton, Duncan Watson-Paris, Jane P Mulcahy, Kirsty J Pringle, Mark Richardson, Jill S Johnson, John W Rostron, Hamish Gordon, Grenville Lister, Philip Stier, Ken S Carslaw
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In-situ constraints on the vertical distribution of global aerosol

Copernicus GmbH

Authors:

Duncan Watson-Parris, Nick Schutgens, Carly Reddington, Kirsty J Pringle, Dantong Liu, James D Allan, Hugh Coe, Ken S Carslaw, Philip Stier

Abstract:

<jats:p>Abstract. Despite ongoing efforts, the vertical distribution of aerosols globally is poorly understood. This in turn leads to large uncertainties in the contributions of the direct and indirect aerosol forcing on climate. Using the Global Aerosol Synthesis and Science Project (GASSP) database – the largest synthesised collection of in-situ aircraft measurements currently available, with more than 1000 flights from 37 campaigns from around the world – we investigate the vertical structure of sub-micron aerosols across a wide range of regions and environments. The application of this unique dataset to assess the vertical distributions of number size distribution and Cloud Condensation Nuclei (CCN) in the global aerosol-climate model ECHAM-HAM reveals that the model underestimates accumulation mode particles in the upper troposphere, especially in remote regions. The processes underlying this discrepancy are explored using different aerosol microphysical schemes and a process sensitivity analysis. These show that the biases are predominantly related to aerosol ageing and removal rather than emissions. </jats:p>
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Influence of future air pollution mitigation strategies on total aerosol radiative forcing

Authors:

S Kloster, F Dentener, J Feichter, F Raes, J van Aardenne, E Roeckner, U Lohmann, P Stier, R Swart
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Influences of in-cloud aerosol scavenging parameterizations on aerosol concentrations and wet deposition in ECHAM5-HAM

Authors:

B Croft, U Lohmann, RV Martin, P Stier, S Wurzler, J Feichter, C Hoose, U Heikkilä, A van Donkelaar, S Ferrachat
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Intercomparison and evaluation of aerosol microphysical properties among AeroCom global models of a range of complexity

Authors:

GW Mann, KS Carslaw, CL Reddington, KJ Pringle, M Schulz, A Asmi, DV Spracklen, DA Ridley, MT Woodhouse, LA Lee, K Zhang, SJ Ghan, RC Easter, X Liu, P Stier, YH Lee, PJ Adams, H Tost, J Lelieveld, SE Bauer, K Tsigaridis, TPC van Noije, A Strunk, E Vignati, N Bellouin, M Dalvi, CE Johnson, T Bergman, H Kokkola, K von Salzen, F Yu, G Luo, A Petzold, J Heintzenberg, A Clarke, JA Ogren, J Gras, U Baltensperger, U Kaminski, SG Jennings, CD O'Dowd, RM Harrison, DCS Beddows, M Kulmala, Y Viisanen, V Ulevicius, N Mihalopoulos, V Zdimal, M Fiebig, H-C Hansson, E Swietlicki, JS Henzig
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