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An ion trap CIMS instrument for combined measurements of atmospheric OH and H2SO4: First test measurements above and inside the planetary boundary layer

Aufmhoff, Heinfried und Hanke, Markus und Uecker, Jens und Schlager, Hans und Arnold, Frank (2011) An ion trap CIMS instrument for combined measurements of atmospheric OH and H2SO4: First test measurements above and inside the planetary boundary layer. International Journal of Mass Spectrometry, 308 (1), Seiten 26-34. DOI: 10.1016/j.ijms.2011.07.016. ISSN 1387-3806.

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Offizielle URL: http://www.sciencedirect.com/science/article/pii/S1387380611002703

Kurzfassung

Gaseous sulfuric acid (GSA) plays an important role in atmospheric secondary aerosol formation. To quantify its contribution to these processes long-term measurements of GSA using a very sensitive detection method are required. OH is the most important oxidant in the atmosphere and oxidizes, e.g., SO2. A powerful detection method is chemical ionization mass spectrometry (CIMS). We have built a novel CIMS instrument composed of an ion trap mass spectrometer (ITMS) and a selective ion source suitable to measure gaseous H2SO4 and OH and to do fragmentation studies. The probe air inlet and sampling line were optimized to minimize wall losses of H2SO4 and OH. An ion source was developed to minimize artificial signals and to create reagent ions ((HNO3)h(H2O)n) which react highly selectively with GSA. An H2SO4/OH calibration source based on water vapor photolysis was developed to overcome uncertainties in remaining wall losses, ion residence time, reaction rate coefficient and mass discrimination. Field measurements of GSA in the planetary boundary layer (several weeks at northern and middle latitudes) and high-altitude mountain-site measurements of GSA and OH were carried out. The ITMS instrument offers a detection limit as low as 1 × 10^5 molecules per cm^3 and a time resolution of about 2 min .

Dokumentart:Zeitschriftenbeitrag
Titel:An ion trap CIMS instrument for combined measurements of atmospheric OH and H2SO4: First test measurements above and inside the planetary boundary layer
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Aufmhoff, Heinfriedheinfried.aufmhoff@dlr.de
Hanke, MarkusMPI for Nuclear Physics, Heidelberg
Uecker, JensMPI for Nuclear Physics, Heidelberg
Schlager, HansDLR
Arnold, FrankMPI for Nuclear Physics, Heidelberg
Datum:1 November 2011
Erschienen in:International Journal of Mass Spectrometry
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:308
DOI :10.1016/j.ijms.2011.07.016
Seitenbereich:Seiten 26-34
ISSN:1387-3806
Status:veröffentlicht
Stichwörter:Sulfuric acid, OH, secondary aerosol formation, Chemical ionization, Ion trap
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:ATM und Flugbetrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Klima, Wetter und Umwelt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Heinfried Aufmhoff
Hinterlegt am:03 Nov 2011 15:00
Letzte Änderung:04 Apr 2013 16:31

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