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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amtd-2-2027-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
28 Aug 2009
Review status
A revision of this discussion paper for further review has not been submitted.
Development and application of a new mobile LOPAP instrument for the measurement of HONO altitude profiles in the planetary boundary layer
R. Häseler, T. Brauers, F. Holland, and A. Wahner ICG-2, Forschungszentrum Jülich, 52425 Jülich, Germany
Abstract. The LOPAP (long path absorption) technique has been shown to be very sensitive for the detection of nitrous acid (HONO) in the atmosphere. However, current instruments were mainly built for ground based applications. Therefore, we designed a new LOPAP instrument to be more versatile for mobile measurements and to meet the requirements for airborne application. The detection limit of the new instrument is below 1 ppt at a time resolution of 5 to 7 min. As a first test, the instrument was successfully employed during the ZEPTER-1 campaign in July 2007 on board of the Zeppelin NT airship. During 15 flights on six days we measured HONO concentration profiles over southwest Germany, predominantly in the range between 100 m and 650 m above ground level. On average, a mixing ratio of 34 ppt was observed, almost independently of height. Within a econd campaign, ZEPTER-2 in fall 2008, higher HONO mixing ratios were observed in the Lake Constance area.

Citation: Häseler, R., Brauers, T., Holland, F., and Wahner, A.: Development and application of a new mobile LOPAP instrument for the measurement of HONO altitude profiles in the planetary boundary layer, Atmos. Meas. Tech. Discuss., 2, 2027-2054, doi:10.5194/amtd-2-2027-2009, 2009.
R. Häseler et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC C601: 'Review comments on amt-2009-56', Anonymous Referee #1, 08 Oct 2009 Printer-friendly Version 
 
RC C653: 'Comments on „Development and application of a new mobile LOPAP instrument for the measurement of HONO altitude profiles in the planetary boundary layer” by Häseler et al.', Anonymous Referee #2, 23 Oct 2009 Printer-friendly Version 
R. Häseler et al.
R. Häseler et al.

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