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Sources of background current in the ECC ozonesonde - Implications for total ozone measurementsThe source of the background current in the usual operation of the electrochemical concentration cell ozonesonde is the reduction of tri-iodide normally present in the cathode solution. The time variations in the background current can be explained by the slow rates of solution mass transport and of heterogeneous electron transfer for tri-iodide. Oxygen does not contribute to the background current through reaction with iodide to produce tri-iodide. Direct reduction of oxygen at the cathode is negligible once the electrodes have been exposed to iodide for 24 hours. The present background current correction is altitude-dependent, since it is based on an assumed sensitivity of the electrochemical concentration cell to oxygen. If the background current is independent of altitude and of oxygen, a constant, uncorrected, background current of 0.1 microamp would produce an error of +5.5% for the total ozone value of the electrochemical concentration cell for a typical midlatitude total ozone value of 0.345 atm-cm.
Document ID
19820064455
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thornton, D. C.
(Drexel Univ. Philadelphia, PA, United States)
Niazy, N.
(Drexel University Philadelphia, PA, United States)
Date Acquired
August 10, 2013
Publication Date
October 20, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Inorganic And Physical Chemistry
Accession Number
82A47990
Funding Number(s)
CONTRACT_GRANT: NSG-6035
Distribution Limits
Public
Copyright
Other

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