Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere
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 ozo...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2010-04-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/3/495/2010/amt-3-495-2010.pdf |
| _version_ | 1818568143854895104 |
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| author | H. Vömel K. Diaz |
| author_facet | H. Vömel K. Diaz |
| author_sort | H. Vömel |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-14T06:32:12Z |
| format | Article |
| id | doaj.art-4c6ebdf4f0924332972c27227d0417ce |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-14T06:32:12Z |
| publishDate | 2010-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-4c6ebdf4f0924332972c27227d0417ce2022-12-21T23:13:29ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482010-04-013249550510.5194/amt-3-495-2010Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphereH. VömelK. DiazLaboratory 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.http://www.atmos-meas-tech.net/3/495/2010/amt-3-495-2010.pdf |
| spellingShingle | H. Vömel K. Diaz Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere Atmospheric Measurement Techniques |
| title | Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere |
| title_full | Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere |
| title_fullStr | Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere |
| title_full_unstemmed | Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere |
| title_short | Ozone sonde cell current measurements and implications for observations of near-zero ozone concentrations in the tropical upper troposphere |
| title_sort | ozone sonde cell current measurements and implications for observations of near zero ozone concentrations in the tropical upper troposphere |
| url | http://www.atmos-meas-tech.net/3/495/2010/amt-3-495-2010.pdf |
| work_keys_str_mv | AT hvomel ozonesondecellcurrentmeasurementsandimplicationsforobservationsofnearzeroozoneconcentrationsinthetropicaluppertroposphere AT kdiaz ozonesondecellcurrentmeasurementsandimplicationsforobservationsofnearzeroozoneconcentrationsinthetropicaluppertroposphere |