Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere
-
Published:2010-04-29
Issue:2
Volume:3
Page:495-505
-
ISSN:1867-8548
-
Container-title:Atmospheric Measurement Techniques
-
language:en
-
Short-container-title:Atmos. Meas. Tech.
Abstract
Abstract. Laboratory measurements of the Electrochemical Concentration Cell (ECC) ozone sonde cell current using ozone free air as well as defined amounts of ozone reveal that background current measurements during sonde preparation are neither constant as a function of time, nor constant as a function of ozone concentration. Using a background current, measured at a defined timed after exposure to high ozone may often overestimate the real background, leading to artificially low ozone concentrations in the upper tropical troposphere, and may frequently lead to operator dependent uncertainties. Based on these laboratory measurements an improved cell current to partial pressure conversion is proposed, which removes operator dependent variability in the background reading and possible artifacts in this measurement. Data from the Central Equatorial Pacific Experiment (CEPEX) have been reprocessed using the improved background treatment based on these laboratory measurements. In the reprocessed data set near-zero ozone events no longer occur. At Samoa, Fiji, Tahiti, and San Cristóbal, nearly all near-zero ozone concentrations occur in soundings with larger background currents. To a large extent, these events are no longer observed in the reprocessed data set using the improved background treatment.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference20 articles.
1. Davies, J., Tarasick, D. W., McElroy, C. T., Kerr, J. B., Fogal, P. F., and Savastiouk, V.: Evaluation of ECC Ozonesonde Preparation Methods from Laboratory Tests and Field Comparisons during MANTRA, Proceedings of the Quadrennial Ozone Symposium Sapporo, Japan, 2000, edited by: Bojkov, R. D. and Kazuo, S., pp. 137–138, 2000. 2. Fujiwara, M., Kita, K., and Ogawa, T.: Stratosphere-troposphere exchange of ozone associated with the equatorial Kelvin wave as observed with ozonesondes and rawinsondes, J. Geophys. Res., 103, 19173–19182, 1998. 3. Hofmann, D. J., Oltmans, S. J., Lathrop, J. A., Harris, J. M., and Vömel, H.: Record low Ozone at South Pole in the Spring of 1993, Geophys. Res. Lett., 21, 421–424, 1994. 4. Johnson, B. J., Oltmans, S. J., Vömel, H., Smit, H. G. J., Deshler, T., and Kröger, C.: Electrochemical concentration cell (ECC) ozonesonde pump efficiency measurements and tests on the sensitivity to ozone of buffered and unbuffered ECC sensor cathode solutions, J. Geophys. Res., 107, 4393, https://doi.org/10.1029/2001JD000557, 2002. 5. Kley, D., Crutzen, P. J., Smit, H. G. J., Vömel, H., Oltmans, S. J., Grassl, H., and Ramanathan, V.: Observations of near-zero ozone concentrations over the convective pacific: effects on air chemistry, Science, 274, 230–233, 1996.
Cited by
53 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|