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      Iodine monoxide in the Antarctic snowpack

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      General Information:

      Citation:
      Frieß, U. , Deutschmann, T. , Gilfedder, B. , Weller, R. and Platt, U. (2009): Iodine monoxide in the Antarctic snowpack , Atmospheric Chemistry and Physics, 102456, 2439 . doi: 10.5194/acp-10-2439-2010
      Cite this page as:
      hdl:10013/epic.34458
      DOI:
      10.5194/acp-10-2439-2010
      Official URL:
      10.5194/acp-10-2439-2010
      Contact Email:
      Rolf.Weller@awi.de
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      Cite this document as:
      hdl:10013/epic.34458.d001
      Abstract:

      Recent ground-based and space borne observations suggest the presence of significant amounts of iodine monoxide in the boundary layer of Antarctica, which are expected to have an impact on the ozone budget and might contribute to the formation of new airborne particles. So far, the source of these iodine radicals has been unknown. This paper presents long-term measurements of iodine monoxide at the German Antarctic research station Neumayer, which indicate that high IO concentrations in the order of 50 ppb are present in the snow interstitial air. The measurements have been performed using multi-axis differential optical absorption spectroscopy (MAX-DOAS). Using a coupled atmosphere snowpack radiative transfer model, the comparison of the signals observed from scattered skylight and from light reflected by the snowpack yields several ppb of iodine monoxide in the upper layers of the sunlit snowpack throughout the year. Snow pit samples from Neumayer Station contain up to 700 ng/l of total iodine, representing a sufficient reservoir for these extraordinarily high IO concentrations.

      Further Details:

      Item Type:
      Article
      Authors:
      Frieß, U. ; Deutschmann, T. ; Gilfedder, B. ; Weller, Rolf ; Platt, U.
      Divisions:
      AWI Organizations > Geosciences > Glaciology
      AWI Organizations > Infrastructure > Operations and Research Platforms
      Programs:
      Helmholtz Research Programs > PACES I (2009-2013) > TOPIC 1: The Changing Arctic and Antarctic
      Helmholtz Research Programs > PACES I (2009-2013) > TOPIC 1: The Changing Arctic and Antarctic > WP 1.3: A Bi-Polar Perspective of Sea Ice - Atmosphere - Ocean - Ecosystem Interactions
      Eprint ID:
      21228
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