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| Titel |
Longpath-DOAS measurements of BrO on the westcoast of Ireland |
| VerfasserIn |
J. Buxmann, K. Seitz, D. Poehler, U. Platt |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027697
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| Zusammenfassung |
| Reactive halogen species (RHS) are of great importance since they influence the
atmospheric ozone chemistry. The involved processes are not fully understood yet.
Two field campaigns were undertaken at the west coast of Ireland at Mace Head
research station and the Martin Ryan Institute (Carna, County Galway) respectively
between August and September of 2007. During both campaigns the RHS BrO was
investigated by active Differential Optical Absorption Spectroscopy (DOAS) in the
marine boundary layer. Expecting very low concentrations of BrO, a low detection
limit is necessary. By using a special strategy and an optimized configuration of the
instruments, noise was significantly reduced compared to earlier investigations.
Boundary layer BrO was detected at peak concentrations of (6,9 ± 1,7) ppt at both
measurement sites in the late afternoon and early morning. Furthermore there was an ozone
depletion event on August 24th from 40 ppb down to 10 ppb connected with high
IO concentrations at the Martin Ryan Institute. At Mace Head diurnal profiles of
BrO were measured for 8 days. An anticorrelation with Ozone concentrations was
found. During the same period BrO also exceeded the detection limit during three
nights reaching levels up to (3 ± 1,2) ppt. Possible causes of this observation are
discussed. |
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