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| Titel |
Long term seasonal variation of stratospheric BrO and NO2 from ground based Zenith Sky DOAS observations at Kiruna, Sweden |
| VerfasserIn |
Myojeong Gu, Carl-Fredrik Enell, Janis Pukite, Sven Kühl, Ulrich Platt, Uwe Raffalski, Thomas Wagner |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250071924
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| Zusammenfassung |
| Stratospheric BrO and NO2 have an important influence on the stratospheric ozone depletion. Several studies have proved the performance of field measurements of stratospheric trace gases. In particular, ground-based zenith-sky Differential Optical Absorption Spectroscopy (DOAS) has successfully monitored BrO and other trace gases related to stratospheric ozone chemistry such as O3, NO2 and OClO. In this study, we investigated the characteristics of stratospheric BrO and NO2 in polar region using zenith-sky DOAS. The instrument was conducted on the Swedish Institute for Space Physics in Kiruna (Sweden, 68.84°N, 20.41°E) since 1996. We present the seasonal variation of BrO and NO2 for the period 1997-2009 and focus on their averaged seasonal trends with respect to different years. The retrieved NO2 and BrO columns are also compared to ECMWF analysis data for investigating the dependence of the NO2 and BrO enhancements on meteorological parameters like stratospheric temperatures, potential vorticity, and PSC area. Also, the NO2 column densities are compared with OMI satellite data. Recently, the instrument was equipped with a new detector which ensures continuous operation in the future. Being one of the longest measurements of spectroscopic measurements of trace gases in the Arctic, the Kiruna observation will contribute to a better understanding of the impacts of stratospheric trace gases and insights of their chemical reactions. |
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