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| Titel |
Iodine Monoxide in the Antarctic Marine Boundary Layer: Recent Discoveries |
| VerfasserIn |
Udo Frieß, Johannes Zielcke, Denis Pöhler, Tim Hay, Karin Kreher, Ulrich Platt |
| 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 |
250079775
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| Zusammenfassung |
| Iodine monoxide (IO) is thought to play an important role in the chemistry of the Antarctic marine boundary layer (MBL). Produced either by organic precursors or by inorganic processes, large areas of enhanced IO were detected by satellite not only around the coast of Antarctica, but also over the continent far from the coastal source regions. In the past, several active and passive remote sensing measurements at coastal stations confirmed the presence of IO, which is expected to have a significant impact on the oxidative capacity and the ozone budget in the MBL.
We present a summary of recent findings regarding IO in the Antarctic MBL, with a focus on two measurement campaigns conducted at the German Research Station Neumayer (70°S, 8°W) and the New Zealand Station Scott Base (177°E, 78°S) in austral summer 2011 and spring 2012, respectively. During both campaigns, IO was measured using a combination of active and passive DOAS remote sensing instruments, including a newly developed mobile open-path cavity-enhanced DOAS instrument.
Satellite measurements indicate that the area around Scott Base in the Ross Sea is subject to particularly high levels of IO. However, in contrast to previous ground-based and satellite borne observations, we find surprisingly low IO concentrations both at Neumayer and Scott Base, with IO being below the detection limit (< 0.5 ppt) of the active DOAS instruments at all times, raising the question to what extent IO is of importance for the chemistry of the Antarctic MBL. |
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