The United States National Science Foundation's Polar Network for monitoring ultraviolet radiation

Booth, Charles R.; Lucas, Timothy; Morrow, John H.; Weiler, Christel; Penhale, Polly A.

doi:10.1029/ar062p0017

Cited by 93 publications

(71 citation statements)

References 19 publications

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“…Ozone calculated from a spectrum that was deliberately shifted by 0.1 nm deviated by 1.3% from the result calculated from the unshifted spectrum. The wavelength accuracy of published UV spectra is tested with an algorithm that compares the Fraunhofer structure in measured spectra with the same structure in a reference spectrum [Slaper et al, 1995;Booth et al, 2001]. The wavelength calibration uncertainty was found to be ±0.04 nm (±1s), which translates into a 0.54% standard uncertainty in ozone.…”

Section: Instrument-related Uncertaintiesmentioning

confidence: 99%

“…Based on the analysis of the instrument's calibration record (see NSF Network Operations Reports [e.g., Booth et al, 2001]), we estimated that the maximum relative calibration error between the 300-315 nm and 325-335 nm wavelength bands is ±1.5%. We calculated further that a 5% error in ozone would require a 12.8% relative calibration error.…”

Section: Instrument-related Uncertaintiesmentioning

confidence: 99%

“…The time required for one spectral measurement is 10.5 min (2.0 min between 305 and 335 nm). All results presented here are based on ''Level 3'' data [Booth et al, 2001], available on the Internet at www.biospherical.com/NSF. Data cover the period July 1996 -June 2001.…”

Section: Instrumentation and Datamentioning

confidence: 99%

“…The instrument is part of the National Science Foundation's Office of Polar Programs (NSF/OPP) UV monitoring network. Details of the instrument and data processing were published by Booth et al [1994, 2001, andreferences therein]. Measurements in the wavelength range 280-605 nm are performed quarterhourly.…”

Section: Instrumentation and Datamentioning

confidence: 99%

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

2003

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A new algorithm to retrieve total column ozone from global spectral UV irradiance measurements is presented, and its accuracy is assessed. The expanded uncertainty (coverage factor 2) of the resulting ozone values varies between 2% and 3.5% for solar zenith angles (SZA) smaller than 75° and clear skies. For larger SZA the uncertainty becomes dominated by the sensitivity of the method to the atmospheric ozone distribution. Using this algorithm, ozone values were calculated from UV spectra measured by the National Science Foundation's SUV‐100 spectroradiometer at Barrow, Alaska, between 1996 and 2001. Special attention was given to March–April 2001, the period when the campaign “Total Ozone Measurements by Satellites, Sondes, and Spectrometers at Fairbanks” (TOMS3F) took place. The data set was compared with observations by NASA's Earth Probe Total Ozone Mapping Spectrometer (TOMS) and a Dobson spectrophotometer operated by NOAA's Climate Monitoring and Diagnostics Laboratory (CMDL) at Barrow. On average, the new algorithm generates ozone values in spring 2.2% lower than TOMS observations and 1.8% higher than Dobson measurements. From the uncertainty budget and the comparison with TOMS and Dobson it can be concluded that ozone values retrieved from global UV spectra have a similar accuracy as observations with standard instrumentation used for ozone monitoring. The new data set can therefore be used for validation of other ozone data.

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Section: Instrument-related Uncertaintiesmentioning

confidence: 99%

Section: Instrument-related Uncertaintiesmentioning

confidence: 99%

Section: Instrumentation and Datamentioning

confidence: 99%

Section: Instrumentation and Datamentioning

confidence: 99%

See 2 more Smart Citations

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

2003

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“…Consequently, long-term monitoring of UV irradiances at the ground are essential for assessing the biological effects of UV and therefore a number of monitoring sites have been established, although coverage is by no means representative for the globe. Increases of UV radiation in response to reductions in total ozone at various sites and for various periods have been reported during the 1990s (Booth et al, 1994;Kerr and McElroy, 1993;Seckmeyer et al, 1994;Zerefos et al, 1997Zerefos et al, , 2001Bartlett and Webb, 2000).…”

Section: Introductionmentioning

confidence: 99%

Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control

et al. 2006

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Abstract. We present a re-evaluation and quality control of spectral ultraviolet irradiance measurements from two Brewer spectroradiometers operating regularly at Thessaloniki, Greece. The calibration history of the two instruments was re-examined and data flaws were identified by comparing quasi synchronous measurements. Analysis of the sensitivity of both instruments to variations of their internal temperature revealed that they have temperature coefficients of different sign. These coefficients exhibit small variability during the 15-year period. Using averaged temperature coefficients, we corrected both datasets. Corrections were applied for the angular response error using two different approaches depending on the availability of required ancillary data. The uncertainties associated with the measurements have been estimated and presented. Finally, the two datasets are compared using ratios of irradiance integrals at various bands in the UV, in order to assess any dependencies on the internal instrument temperature, solar zenith angle and wavelength.

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Incident Ultraviolet Radiation and Disappearance of the Aquatic Macrophyte Egeria densa in a Ramsar Wetlands Site

Lovengreen¹,

Morrow

Jaramillo

et al. 2008

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During mid 2004, abrupt environmental changes including a massive die off of the dominant macrophyte Egeria densa were observed within the wetlands of Río Cruces, a Ramsar site in southern Chile. One of the hypotheses presented to explain these changes was that increased ultraviolet radiation (UVR) may have been responsible. Since variation in UVR operates at regional scales, it is important to understand if the demise of E. densa also occurs at concurrent spatial and temporal scales. The current results demonstrate that monthly and annual variability of UVB was very stable during 1998 to 2006. Furthermore, in situ vertical profiles sampled across the wetlands and nearby rivers showed that UVR penetrates deeper into waters located outside the wetlands, where healthy stands of E. densa are commonly seen. The massive die off of E. densa within the Río Cruces wetlands cannot be explained by regional variability in UVR, and it is much more likely that the definitive reason is found locally within the wetlands rather than regionally.

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The United States National Science Foundation's Polar Network for monitoring ultraviolet radiation

Cited by 93 publications

References 19 publications

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

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

Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control

Incident Ultraviolet Radiation and Disappearance of the Aquatic Macrophyte Egeria densa in a Ramsar Wetlands Site

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