Oxalic acid in clear and cloudy atmospheres: Analysis of data from International Consortium for Atmospheric Research on transport and transformation 2004
Brechtel, Fred J.
Murphy, Shane M.
Holloway, John S.
Atlas, Elliot L.
Flagan, Richard C.
Seinfeld, John H.
MetadataShow full item record
Oxalic acid is often the leading contributor to the total dicarboxylic acid mass in ambient organic aerosol particles. During the 2004 International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) field campaign, nine inorganic ions (including SO4 2!) and five organic acid ions (including oxalate) were measured on board the Center for Interdisciplinary Remotely Piloted Aircraft Studies (CIRPAS) Twin Otter research aircraft by a particle-into-liquid sampler (PILS) during flights over Ohio and surrounding areas. Five local atmospheric conditions were studied: (1) cloud-free air, (2) power plant plume in cloud-free air with precipitation from scattered clouds overhead, (3) power plant plume in cloud-free air, (4) power plant plume in cloud, and (5) clouds uninfluenced by local pollution sources. The aircraft sampled from two inlets: a counterflow virtual impactor (CVI) to isolate droplet residuals in clouds and a second inlet for sampling total aerosol. A strong correlation was observed between oxalate and SO4 2! when sampling through both inlets in clouds. Predictions from a chemical cloud parcel model considering the aqueous-phase production of dicarboxylic acids and SO4 2! show good agreement for the relative magnitude of SO4 2! and oxalate growth for two scenarios: power plant plume in clouds and clouds uninfluenced by local pollution sources. The relative contributions of the two aqueous-phase routes responsible for oxalic acid formation were examined; the oxidation of glyoxylic acid was predicted to dominate over the decay of longer-chain dicarboxylic acids. Clear evidence is presented for aqueous-phase oxalic acid production as the primary mechanism for oxalic acid formation in ambient aerosols.
Journal of Geophysical Research, Vol. 111, D23S45The article of record as published may be located at http://dx.doi.org/10.1029/2005D006880.
Showing items related by title, author, creator and subject.
Crahan, Kathleen K.; Hegg, Dean; Covert, David S.; Jonsson, Haflidi (2004);Oxalic acid is the most abundant dicarboxylic acid found in the troposphere, yet there is still no scientific consensus concerning its origins or formation process. Recent studies have suggested mechanisms for its formation ...
Aerosol-cloud drop concentration closure for clouds sampled during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign Fountoukis, Christos; Nenes, Athanasios; Meskhidze, Nicholas; Bahreini, Roya; Conant, William C.; Jonsson, Haflidi; Murphy, Shane; Sorooshian, Armin; Varutbangkul, Varuntida; Brechtel, Fred; Flagan, Richard C.; Seinfeld, John H. (2007);This study analyzes 27 cumuliform and stratiform clouds sampled aboard the CIRPAS Twin Otter during the 2004 International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) experiment. The data ...
Impact of emissions from shipping, land, and the ocean on stratocumulus cloud water elemental composition during the 2011 E-PEACE field campaign Wang, Z.; Sorooshian, A.; Prabhakar, G.; Coggon, M.M.; Jonsson, H.H. (Elsevier Ltd., 2014);This study reports on cloud water chemical and pH measurements off the California coast during the July-August 2011 Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE). Eighty two cloud water samples were collected ...