Spatial distributions of trace organic species: Results from the TORERO and CONTRAST airborne campaigns with the interpretation aided by the CAM-Chem 3D chemistry climate model

Tuesday, 16 December 2014
Eric C Apel1, Rebecca S Hornbrook1, Alan J Hills1, Teresa Lynn Campos1, Laura Pan1, Douglas Edward Kinnison1, J F Lamarque1, Louisa K Emmons1, Alfonso Saiz-Lopez2, Daniel D Riemer3, Nicola J Blake4, Donald Ray Blake4, Elliot L Atlas5, Sue Schauffler1, Valeria Donets5, Richard Lueb5 and Ross J Salawitch6, (1)National Center for Atmospheric Research, Boulder, CO, United States, (2)Spanish National Research Council, Zaragoza, Spain, (3)University of Miami, Miami, FL, United States, (4)University of California Irvine, Irvine, CA, United States, (5)RSMAS, Miami, FL, United States, (6)University of Maryland, College Park, MD, United States
A wide range of trace volatile organic compounds (VOCs) were measured during the Tropical Ocean Troposphere Exchange of Reactive Halogen Species and Oxygenated VOC (TORERO), and Convective Transport of Active Species in the Tropics (CONTRAST). The NCAR Trace Organic Gas Analyzer (TOGA) measured VOCs on board the NSF GV aircraft during both of these experiments. Complementary VOC measurements were made by the UM AWAS on board the GV during CONTRAST. The relatively rapid TOGA measurements (30 second data every 2 minutes) coupled with the very high sensitivity of the instrument allows for tracking signatures of pollution in an otherwise near pristine environment (CONTRAST, TORERO) and for mapping out gradients in the VOC distributions in the northern and southern hemispheres. Because of the wide range of solubilities and reactivities the suite of measured VOCs encompasses, these species provide critical information on the transport and chemical and/or physical processing during and following convective events (CONTRAST). In this study, we use the CAM-Chem 3D chemistry climate model driven with MERRA meteorological fields to provide context to our observational data. The model has a detailed representation of tropospheric and stratospheric chemistry. Its scope has recently been extended to include halogen sources, reactive halogen chemistry, and related atmospheric processes.