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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 12 — Apr. 20, 2001
  • pp: 1989–2003

Ozone Column Density Determination From Direct Irradiance Measurements in the Ultraviolet Performed by a Four-Channel Precision Filter Radiometer

Thomas Ingold, Christian Mätzler, Christoph Wehrli, Alain Heimo, Niklaus Kämpfer, and Rolf Philipona  »View Author Affiliations


Applied Optics, Vol. 40, Issue 12, pp. 1989-2003 (2001)
http://dx.doi.org/10.1364/AO.40.001989


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Abstract

Ultraviolet light was measured at four channels (305, 311, 318, and 332 nm) with a precision filter radiometer (UV-PFR) at Arosa, Switzerland (46.78°, 9.68°, 1850 m above sea level), within the instrument trial phase of a cooperative venture of the Swiss Meteorological Institute (MeteoSwiss) and the Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center. We retrieved ozone-column density data from these direct relative irradiance measurements by adapting the Dobson standard method for all possible single-difference wavelength pairs and one double-difference pair (305/311 and 305/318) under conditions of cloud-free sky and of thin clouds (cloud optical depth <2.5 at 500 nm). All UV-PFR retrievals exhibited excellent agreement with those of collocated Dobson and Brewer spectrophotometers for data obtained during two months in 1999. Combining the results of the error analysis and the findings of the validation, we propose to retrieve ozone-column density by using the 305/311 single difference pair and the double-difference pair. Furthermore, combining both retrievals by building the ratio of ozone-column density yields information that is relevant to data quality control. Estimates of the 305/311 pair agree with measurements by the Dobson and Brewer instruments within 1% for both the mean and the standard deviation of the differences. For the double pair these values are in a range up to 1.6%. However, this pair is less sensitive to model errors. The retrieval performance is also consistent with satellite-based data from the Earth Probe Total Ozone Mapping Spectrometer (EP-TOMS) and the Global Ozone Monitoring Experiment instrument (GOME).

© 2001 Optical Society of America

OCIS Codes
(010.4950) Atmospheric and oceanic optics : Ozone
(040.7190) Detectors : Ultraviolet
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(350.2460) Other areas of optics : Filters, interference

Citation
Thomas Ingold, Christian Mätzler, Christoph Wehrli, Alain Heimo, Niklaus Kämpfer, and Rolf Philipona, "Ozone Column Density Determination From Direct Irradiance Measurements in the Ultraviolet Performed by a Four-Channel Precision Filter Radiometer," Appl. Opt. 40, 1989-2003 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-12-1989

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