Technical Note: Quantification of interferences of wet chemical HONO measurements under simulated polar conditions
International audience In the present pilot study, an optimized LOPAP instrument for the detection of nitrous acid (HONO) in the atmosphere (DL 0.2 pptV) was tested at the high alpine research station "Jungfraujoch" at 3580 m altitude in the Swiss Alps under conditions comparable to polar...
| Main Authors: | , |
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| Other Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
HAL CCSD
2008
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| Subjects: | |
| Online Access: | https://hal.science/hal-00303981 https://hal.science/hal-00303981/document https://hal.science/hal-00303981/file/acpd-8-3497-2008.pdf |
| Summary: | International audience In the present pilot study, an optimized LOPAP instrument for the detection of nitrous acid (HONO) in the atmosphere (DL 0.2 pptV) was tested at the high alpine research station "Jungfraujoch" at 3580 m altitude in the Swiss Alps under conditions comparable to polar regions. HONO concentrations in the range <0.5?50 pptV with an average of 7.5 pptV were observed at the "Jungfraujoch". The diurnal profiles obtained exhibited clear maxima at noon and minima with very low concentration during the night supporting the proposed photochemical production of HONO. In good agreement with recent measurements at the South Pole, it was demonstrated, that interferences of chemical HONO instruments can significantly influence the measurements and lead to considerable overestimations, especially for low pollution level. Accordingly, the correction of interferences is of paramount importance for those instruments, which sample HONO on aqueous or humid surfaces. |
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