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Titel |
MAX-DOAS Measurements on RV Polarstern |
VerfasserIn |
Johannes Lampel, Sabrina Niebling, Jens Tschritter, Udo Frieß, Ulrich Platt |
Konferenz |
EGU General Assembly 2011
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 13 (2011) |
Datensatznummer |
250053280
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Zusammenfassung |
Reactive bromine and iodine compounds (e.g. iodine monoxide or OIO) emitted from
the ocean in the atmosphere can be of great importance for the chemical balance
of the marine boundary layer, even if they are present in very small amounts of
only some parts per trillion. Their impact ranges from the destruction of ozone
and the modification of the oxidative capacity to the formation of new ultrafine
particles and possible influences on the global climate via modification of cloud optical
properties.
Here we present measurements from our long-term Multi-Axis DOAS instrument aboard the
research vessel Polarstern. MAX-DOAS measurements, ranging from the Arctic over tropical
regions to Antarctica, have been performed aboard Polarstern for almost ten years. The data
gathered on Polarstern might be useful for satellite data validation because of its spacial
coverage. In 2009, the spectrometer was replaced to extend the spectral range and to improve
the detection limits. The extension of the spectral range to 300-600nm allows for
aerosol retrieval based on different absorption peaks of oxygen dimer O4. A new
telescope unit was installed, which actively compensates for the roll movement of the
ship.
Focusing on the Atlantic transect ANT 26/1 from Bremerhaven/Germany to Punta
Arenas/Chile in autumn 2009, its capabilities are discussed and iodine oxide column densities
as well as aerosol profiles obtained during the cruise will be presented. During this transect
the new setup has proven to run stable. On numerous days the iodine oxide column densities
were found to exceed the detection limit of 1.5 -
1013cm-2. This would correspond to a
mixing ratio of 0.6ppt assuming a path of light of 10km in marine boundary layer. |
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