Title Modelling the reversible uptake of chemical species in the gas phase by ice particles formed in a convective cloud
Author Marécal, V.; Pirre, M.; Rivière, E.D.; Pouvesle, N.; Crowley, J.N.; Freitas, S.R.; Longo, K.M.
Author Affil Marécal, V., CNRS, Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, Orleans, France. Other: Université de Reims, France; Max-Planck- Institut für Chemie, Germany; Instituto Nacional de Pesquisas Espaciais, Brazil
Source Atmospheric Chemistry and Physics, 10(10), p.4977-5000, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Part of special issue no. 124, SCOUT-O3 Tropics, edited by Brunner, D., et al., http://www.atmos-chem- phys.net/special_issue124.html; published in Atmospheric Chemistry and Physics Discussions: 16 November 2009, http://www.atmos-chem-phys- discuss.net/9/24361/2009/acpd-9-24361-2009.ht ml; accessed in May, 2011. 59 refs. GeoRef Acc. No: 310047
Index Terms clouds (meteorology); convection; gases; ice; models; particles; simulation; snow; statistical analysis; temperature; time factor; microelement content; acetic acid; acetone; alcohols; atmosphere; Brazilian developments on the Regional Atmospheric Modeling System; carboxylic acids; clouds; ethanol; formaldehyde; formic acid; gaseous phase; hydrochloric acid; hydrogen chloride; hydrogen peroxide; inorganic acids; ketones; Langmuir equation; methanol; mixing; nitric acid; organic acids; organic compounds; partition coefficients; peroxyacetyl nitrate; proponal; standard deviation; three- dimensional models; trace elements; troposphere
Abstract The present paper is a preliminary study preparing the introduction of reversible trace gas uptake by ice particles into a 3-D cloud resolving model. For this a 3-D simulation of a tropical deep convection cloud was run with the BRAMS cloud resolving model using a two-moment bulk microphysical parameterization. Trajectories within the convective clouds were computed from these simulation outputs along which the variations of the pristine ice, snow and aggregate mixing ratios and concentrations were extracted. The reversible uptake of 11 trace gases by ice was examined assuming applicability of Langmuir isotherms using recently evaluated (IUPAC) laboratory data. The results show that ice uptake is only significant for HNO3, HCl, CH3COOH and HCOOH. For H2O2, using new results for the partition coefficient results in significant partitioning to the ice phase for this trace gas also. It was also shown that the uptake is largely dependent on the temperature for some species. The adsorption saturation at the ice surface for large gas mixing ratios is generally not a limiting factor except for HNO3 and HCl for gas mixing ratio greater than 1 ppbv. For HNO3, results were also obtained using a trapping theory, resulting in a similar order of magnitude of uptake, although the two approaches are based on different assumptions. The results were compared to those obtained using a BRAMS cloud simulation based on a single-moment microphysical scheme instead of the two moment scheme. We found similar results with a slightly more important uptake when using the single-moment scheme which is related to slightly higher ice mixing ratios in this simulation. The way to introduce these results in the 3-D cloud model is discussed.
URL http://www.atmos-chem-phys.net/10/4977/2010/acp-10-4977-2010.pdf
Publication Type journal article
Record ID 65006805