Ozone in Los Angeles and Surrounding Areas

Bartel, A. W.; Temple, J. W.

doi:10.1021/ie50508a043

Cited by 9 publications

(5 citation statements)

References 3 publications

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“…It is typically measured by sampling air between 2 m and 10 m above the surface. Historical observations of surface ozone mixing ratios (mole fractions) range from zero to over 400 nmol mol -1 (Bartel and Temple, 1952;Riveros et al, 1998;Lacasaña-Navarro et al, 1999). As documented in this article, current measurements rarely exceed 200 nmol mol -1 (see Table 5 in section 5).…”

Section: Introductionmentioning

confidence: 77%

Tropospheric Ozone Assessment Report: Database and metrics data of global surface ozone observations

Schultz

Schröder²,

Lyapina³

et al. 2017

Elementa: Science of the Anthropocene

227

240

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In support of the first Tropospheric Ozone Assessment Report (TOAR) a relational database of global surface ozone observations has been developed and populated with hourly measurement data and enhanced metadata. A comprehensive suite of ozone data products including standard statistics, health and vegetation impact metrics, and trend information, are made available through a common data portal and a web interface. These data form the basis of the TOAR analyses focusing on human health, vegetation, and climate relevant ozone issues, which are part of this special feature.Cooperation among many data centers and individual researchers worldwide made it possible to build the world's largest collection of in-situ hourly surface ozone data covering the period from 1970 to 2015. By combining the data from almost 10,000 measurement sites around the world with global metadata information, new analyses of surface ozone have become possible, such as the first globally consistent characterisations of measurement sites as either urban or rural/remote. Exploitation of these global metadata allows for new insights into the global distribution, and seasonal and long-term changes of tropospheric ozone and they enable TOAR to perform the first, globally consistent analysis of present-day ozone concentrations and recent ozone changes with relevance to health, agriculture, and climate.Considerable effort was made to harmonize and synthesize data formats and metadata information from various networks and individual data submissions. Extensive quality control was applied to identify questionable and erroneous data, including changes in apparent instrument offsets or calibrations. Such data were excluded from TOAR data products. Limitations of a posteriori data quality assurance are discussed. As a result of the work presented here, global coverage of surface ozone data for scientific analysis has been significantly extended. Yet, large gaps remain in the surface observation network both in Schultz et al: Tropospheric Ozone Assessment Report Art. 58, page 2 of 26 terms of regions without monitoring, and in terms of regions that have monitoring programs but no public access to the data archive. Therefore future improvements to the database will require not only improved data harmonization, but also expanded data sharing and increased monitoring in data-sparse regions.

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Section: Introductionmentioning

confidence: 77%

Tropospheric Ozone Assessment Report: Database and metrics data of global surface ozone observations

Schultz

Schröder²,

Lyapina³

et al. 2017

Elementa: Science of the Anthropocene

227

240

View full text Add to dashboard Cite

show abstract

“…The sensor solution composition recipes used by the early ECC ozonesondes originated from the wet chemical, iodometric techniques (Bartel and Temple, 1952;Littman and Benoliel, 1953;Saltzman and Gilbert, 1959;Boyd et al, 1970). The method involves the absorption of ozone and oxidation of iodide ions to iodine (I 2 ) with an overall stoichiometric balance of 1 : 1 (O 3 = I 2 ) as shown in Eq.…”

Section: Sensing Solution Type Changesmentioning

confidence: 99%

Homogenizing and estimating the uncertainty in NOAA's long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde

et al. 2018

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Abstract. NOAA's program of long-term monitoring of the vertical distribution of ozone with electrochemical concentration cell (ECC) ozonesondes has undergone a number of changes over the 50-year record. In order to produce a homogenous data set, these changes must be documented and, where necessary, appropriate corrections applied. This is the first comprehensive and consistent reprocessing of NOAA's ozonesonde data records that corrects for these changes using the rawest form of the data (cell current and pump temperature) in native resolution as well as a point-by-point uncertainty calculation that is unique to each sounding. The reprocessing is carried out uniformly at all eight ozonesonde sites in NOAA's network with differences in sensing solution and ozonesonde types accounted for in the same way at all sites. The corrections used to homogenize the NOAA ozonesonde data records greatly improve the ozonesonde measurements with an average one sigma uncertainty of ±4-6 % in the stratosphere and ±5-20 % in the troposphere. A comparison of the integrated column ozone from the ozonesonde profile with co-located Dobson spectrophotometers total column ozone measurements shows agreement within ±5 % for > 70 % of the profiles. Very good agreement is also found in the stratosphere between ozonesonde profiles and profiles retrieved from the Solar Backscatter Ultraviolet (SBUV) instruments.

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“…The sensor solution composition recipes 20 used by the early ECC ozonesondes originated from the wet chemical, iodometric techniques (Bartel and Temple (1952); Littman and Benoliel (1953); Saltzman and Gilbert (1959); Boyd et al (1970)). The method involves the absorption of ozone and oxidation of iodide ions to iodine (I2) with an overall stoichiometric balance of 1:1 (O3 = I2) as shown in Eqn.…”

Section: Sensing Solution Type Changesmentioning

confidence: 99%

Homogenizing and Estimating the Uncertainty in NOAA’s Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde

Sterling¹,

Johnson²,

Oltmans³

et al. 2017

Preprint

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Abstract. NOAA's program of long term monitoring of the vertical distribution of ozone with Electrochemical ConcentrationCell (ECC) ozonesondes has undergone a number of changes over the 50 year record. In order to produce a homogenous data set, these changes must be documented and where necessary, appropriate corrections applied. This is the first comprehensive and consistent reprocessing of NOAA's ozonesonde data records that corrects for these changes using the rawest form of the 15 data (cell current and pump temperature) in native resolution as well as a point by point uncertainty calculation that is unique to each sounding. The reprocessing is carried out uniformly at all eight ozonesonde sites in NOAA's network with differences in sensing solution and ozonesonde types accounted for in the same way at all sites. The corrections used to homogenize the NOAA ozonesonde data records greatly improve the ozonesonde measurements with an average one sigma uncertainty of ±4-6% in the stratosphere and ±5-20% in the troposphere. A comparison of the integrated column ozone from the ozonesonde 20 profile with co-located Dobson spectrophotometers total column ozone measurements shows agreement within ±5% for >70% of the profiles. Very good agreement is also found in the stratosphere between ozonesonde profiles and profiles retrieved from the Solar Backscatter Ultraviolet Instruments (SBUV).

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Ozone in Los Angeles and Surrounding Areas

Cited by 9 publications

References 3 publications

Tropospheric Ozone Assessment Report: Database and metrics data of global surface ozone observations

Tropospheric Ozone Assessment Report: Database and metrics data of global surface ozone observations

Homogenizing and estimating the uncertainty in NOAA's long-term vertical ozone profile records measured with the electrochemical concentration cell ozonesonde

Homogenizing and Estimating the Uncertainty in NOAA’s Long Term Vertical Ozone Profile Records Measured with the Electrochemical Concentration Cell Ozonesonde

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