Calculation of total column ozone from global UV spectra at high latitudes

Bernhard, Germar; Booth, Charles R.; McPeters, Richard D.

doi:10.1029/2003jd003450

Cited by 36 publications

(45 citation statements)

References 18 publications

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“…Total ozone was retrieved consistently for all years from measured UV spectra according to Bernhard et al (2003). The algorithm takes seasonal variation in the vertical ozone and temperature profiles into account and has been validated against measurements of a Dobson photometer operated by NOAA at Barrow and observations from the Total Ozone Mapping Spectrometer (TOMS) on NASA's Earth Probe satellite .…”

Section: Discussionmentioning

confidence: 99%

Trends of solar ultraviolet irradiance at Barrow, Alaska, and the effect of measurement uncertainties on trend detection

Bernhard

2011

Atmos. Chem. Phys.

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Abstract. Spectral ultraviolet (UV) irradiance has been observed near Barrow, Alaska (71 • N, 157 • W) between 1991 and 2011 with an SUV-100 spectroradiometer. The instrument was historically part of the US National Science Foundation's UV Monitoring Network and is now a component of NSF's Arctic Observing Network. From these measurements, trends in monthly average irradiance and their uncertainties were calculated. The analysis focuses on two quantities, the UV Index (which is affected by atmospheric ozone concentrations) and irradiance at 345 nm (which is virtually insensitive to ozone). Uncertainties of trend estimates depend on variations in the data due to (1) natural variability, (2) systematic and random errors of the measurements, and (3) uncertainties caused by gaps in the time series. Using radiative transfer model calculations, systematic errors of the measurements were detected and corrected. Different correction schemes were tested to quantify the sensitivity of the trend estimates on the treatment of systematic errors. Depending on the correction method, estimates of decadal trends changed between 1.5 % and 2.9 %. Uncertainties in the trend estimates caused by error sources (2) and (3) were set into relation with the overall uncertainty of the trend determinations. Results show that these error sources are only relevant for February, March, and April when natural variability is low due to high surface albedo. This method of addressing measurement uncertainties in time series analysis is also applicable to other geophysical parameters. Trend estimates varied between −14 % and +5 % per decade and were significant (95.45 % confidence level) only for the month of October. Depending on the correction method, October trends varied between −11.4 % and −13.7 % for irradiance at 345 nm and between −11.7 % and −14.1 % for the UV Index. These large trends are consistent with trends Correspondence to: G. Bernhard (bernhard@biospherical.com) in short-wave (0.3-3.0 µm) solar irradiance measured with pyranometers at NOAA's Barrow Observatory and can be explained by a change in snow cover over the observation period: analysis of pyranometer data indicates that the first day of fall when albedo becomes larger than 0.6 after snow fall, and remains above 0.6 for the rest of the winter, has advanced with a statistically significant trend of 13.6 ± 9.7 days per decade.

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Section: Discussionmentioning

confidence: 99%

Trends of solar ultraviolet irradiance at Barrow, Alaska, and the effect of measurement uncertainties on trend detection

Bernhard

2011

Atmos. Chem. Phys.

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“…Finally it is noted that Bernhard et al (2003) have developed an improved method to derive the total ozone column from global UV spectra using uvspec.…”

Section: Inhomogeneous Clouds (Uvspec)mentioning

confidence: 99%

Technical note: The libRadtran software package for radiative transfer calculations - description and examples of use

2005

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Abstract. The libRadtran software package is a suite of tools for radiative transfer calculations in the Earth's atmosphere. Its main tool is the uvspec program. It may be used to compute radiances, irradiances and actinic fluxes in the solar and terrestrial part of the spectrum. The design of uvspec allows simple problems to be easily solved using defaults and included data, hence making it suitable for educational purposes. At the same time the flexibility in how and what input may be specified makes it a powerful and versatile tool for research tasks. The uvspec tool and additional tools included with libRadtran are described and realistic examples of their use are given. The libRadtran software package is available from http://www.libradtran.org.

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“…The next two sections compare total ozone and erythema between several of the participating instruments. The participants were instructed to use their existing algorithms that are described elsewhere [34,35,36,37].…”

Section: Introductionmentioning

confidence: 99%

2003 North American interagency intercomparison of ultraviolet spectroradiometers: scanning and spectrograph instruments.

Lantz

2008

J. Appl. Remote Sens

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Abstract. The fifth North American Intercomparison of Ultraviolet MonitoringSpectroradiometers was held June 13 to 21, 2003 at Table Mountain outside of Boulder, Colorado, USA. The main purpose of the Intercomparison was to assess the ability of spectroradiometers to accurately measure solar ultraviolet irradiance, and to compare the results between instruments of different monitoring networks. This Intercomparison was coordinated by NOAA and included participants from six national and international agencies. The UV measuring instruments included scanning spectroradiometers, spectrographs, and multi-filter radiometers. Synchronized spectral scans of the solar irradiance were performed between June 16 and 20, 2003. The spectral responsivities were determined for each instrument using the participants' lamps and calibration procedures and with NOAA/CUCF standard lamps. This paper covers the scanning spectroradiometers and the one spectrograph. The solar irradiance measurements from the different instruments were deconvolved using a high resolution extraterrestrial solar irradiance and reconvolved with a 1-nm triangular bandpass to account for differences in the bandwidths of the instruments. The measured solar irradiance from the spectroradiometers using the rivmSHIC algorithm on a clear-sky day on DOY 172 at 17.0 UTC (SZA = 30°) had a relative 1-σ standard deviation of +/-2.6 to 3.4% for 300-to 360-nm using the participants' calibration.

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Calculation of total column ozone from global UV spectra at high latitudes

Cited by 36 publications

References 18 publications

Trends of solar ultraviolet irradiance at Barrow, Alaska, and the effect of measurement uncertainties on trend detection

Trends of solar ultraviolet irradiance at Barrow, Alaska, and the effect of measurement uncertainties on trend detection

Technical note: The libRadtran software package for radiative transfer calculations - description and examples of use

2003 North American interagency intercomparison of ultraviolet spectroradiometers: scanning and spectrograph instruments.

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