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UP: Umweltphysik

UP 19: Neuartige Messverfahren der Umweltphysik

UP 19.3: Fachvortrag

Dienstag, 14. März 2006, 17:00–17:15, A

PTR-MS measurements of HCHO and results from HCHO intercomparison measurements in the atmosphere simulation chamber SAPHIR — •Armin Wisthaler¹, Armin Hansel¹, Ralf Koppmann², Theo Brauers², Jens Boßmeier², Rainer Steinbrecher³, Wolfgang Junkermann³, Rudi Meier³, Konrad Müller⁴, Sheena Solomon⁵, and Arve Bjerke⁶ — ¹Institut für Ionenphysik, Universität Innsbruck, Innsbruck — ²ICG-II, Forschungszentrum Jülich, Jülich — ³IMK-IFU, Forschungszentrum Karlsruhe, Garmisch-Partenkirchen — ⁴Institut für Troposphärenforschung, Leipzig — ⁵Institut für Umweltphysik, Universität Bremen, Bremen — ⁶NILU, Kjeller, Norwegen

Formaldehyde (HCHO) is a key species for studies of photochemical oxidation pathways in the troposphere. Thus far, several techniques for atmospheric HCHO measurements have emerged but the availability of a compact and sensitive instrument for on-line HCHO measurement in the field is desirable. Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) meets the desired criteria to a great extent but previous attempts to use PTR-MS for HCHO measurements have yielded discouraging results. Here, we will present modifications to the PTR-MS technique by which the instrument’s performance for HCHO detection can be significantly improved. Results from intercomparison measurements with other techniques (Hantzsch monitor, DOAS, DNPH/HPLC/UV-VIS) conducted in the atmosphere simulation chamber SAPHIR at the Research Centre Jülich will be presented.