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Atmospheric Composition

We will measure the total column and the altitude distribution of ClO in the stratosphere, using the technique of ground-based millimeter-wave spectroscopy. Measurements will be made at two sites, Mauna Kea, Hawaii (20N) and Scott Base, Antarctica (78S). Our record of ClO measurements at the two sites is long and detailed. At Mauna Kea, we have made near-continuous measurements with the same instrument since 1992, as well as a few high quality measurements with an earlier instrument since 1982. At Scott Base, the same instrument has provided near continuous measurements since 1996, and the same, earlier instrument used at Mauna Kea acquired data in 1986 and 1987. These measurements have provided the most complete record of the increase and decline of stratospheric ClO, and demonstrated that ClO has been closely correlated with ozone loss over many years. We will monitor this decline and assess its implications for the decline of total stratospheric chlorine. The instruments used for these measurements employ technology which was state-of-the-art twenty years ago, but which is now obsolescent, prone to catastrophic failure which would at a minimum cause a lengthy interruption to the data set, and which could be in practice irrecoverable. We will propose a modification which will virtually eliminate this risk. The long-term stability of calibration of the instruments is vital to their scientific value. We will complete a quantitative assessment of the calibration stability, and will use the Mauna Kea data record to cross-validate the ClO measurements of the UARS and Aura MLS instruments. Finally, we will use the Scott Base ClO data in conjunction with nearby measurements of HCl and ClONO2 and an inference of stratospheric Cly to estimate the column of Cl2O2. The estimate will then be used to assess recent laboratory measurements of the Cl2O2 photolysis.

Project PI: Jin Koda/SUNY Stony Brook

Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, NY 11794-3800

Phone: (631)632-8063

Fax: (631)632-1745 

Email: jin.koda@stonybrook.edu

http://astro.sunysb.edu/koda/

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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