Regensburg 2007 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 6: Heterogene Prozesse in der Atmosphäre - gemeinsam mit dem Arbeitskreis Athmosphärenchemie (AKAC) der GDCh
UP 6.7: Vortrag
Montag, 26. März 2007, 16:30–16:45, H48
MAX-DOAS Measurements of HONO during MCMA-2006 — •Roman Sinreich1, Thomas Wagner1,2, Andre Merten1, Ulrich Platt1, Philip Sheehy3, Luisa Tan Molina3,4, and Rainer Volkamer3,5 — 1Environmental Physics, University of Heidelberg, Heidelberg, Germany — 2now at Max Planck Institute for Chemistry, Mainz, Germany — 3Earth, Atmospheric, and Planetary Sciences, MIT, Cambridge, MA 02139, USA — 4Molina Center for Energy and the Environment, La Jolla, CA 92037, USA — 5Chemistry and Biochemistry, UC San Diego, La Jolla, CA 92093, USA
During Mexico City Metropolitan Area-2006 (MCMA-2006) in March 2006 we performed Multiple Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements. MAX-DOAS instruments observe scattered sunlight from a variety of viewing directions to derive slant column densities (SCDs, integrated concentration along the light path). This setup also allows to gain information on the vertical distribution of atmospheric trace gases under the assumption of a well mixed trace gas layer. The measurements were conducted at different sites in and around Mexico City to constrain transport and physico-chemical transformation processes. SCDs as well as vertical columns of HONO could be retrieved, which to our knowledge is the first example of HONO detection by passive DOAS in the atmosphere. We present HONO time series and compare them with active DOAS measurements of the same measurement campaign which allows to estimate spatial distributions of HONO. Furthermore, we roughly discuss sources and sinks.