研究目的
To present and discuss results of an aerosol optical depth algorithm to be used in the European Brewer Network, which provides data in near real time of more than 30 spectrophotometers located from Tamanrasset (Algeria) to Kangerlussuaq (Greenland).
研究成果
The study demonstrates that well-maintained Brewer spectrophotometers can measure AOD with a precision better than 0.01 and an uncertainty of less than 0.05 in the ultraviolet range from 300 to 320 nm. The stability of the measurements is similar to that of ozone measurements. Future improvements to the algorithm and instrument characterization are discussed.
研究不足
The study is limited to the ultraviolet range from 300 to 320 nm. The precision and uncertainty of the measurements are affected by factors such as the signal-to-noise ratio at shorter wavelengths and the need for regular maintenance and calibration of the instruments.
1：Experimental Design and Method Selection:
The methodology involves the use of Brewer spectrophotometers for measuring aerosol optical depth (AOD) in the ultraviolet range. The algorithm includes corrections for filter attenuation, internal polarization, and seasonal variation of the Earth-Sun distance.
2：Sample Selection and Data Sources:
Data from the Brewer Intercomparison Campaigns in 2013 and 2015, and the period in between, were used. Comparisons were made with Cimel sunphotometers and UVPFR instruments.
3：List of Experimental Equipment and Materials:
Brewer spectrophotometers, Cimel sunphotometers, and UVPFR instruments were used.
4：Experimental Procedures and Operational Workflow:
The AOD was determined using the Beer-Lambert-Bouguer equation, with corrections applied for various factors affecting the measurements.
5：Data Analysis Methods:
The precision, stability, and uncertainty of the Brewer AOD were analyzed, and comparisons were made with data from Cimel and UVPFR instruments.
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