研究目的
To present a compact array spectroradiometer capable of precise and robust measurements of solar UV spectral direct irradiance for accurate total ozone column (TOC) retrieval, with reduced internal stray light eliminating the need for mathematical corrections.
研究成果
The BTS2048-UV-S series spectroradiometer demonstrated its capability for accurate solar UV spectral direct irradiance measurements and TOC retrieval, with deviations of less than 1.5% from most other instruments and not exceeding 3% from established systems like Dobson or Brewer. Future improvements aim to enhance radiometric sensitivity, especially at higher solar zenith angles.
研究不足
At higher solar zenith angles or air mass, the signal-to-noise ratio decreases, especially at low wavelengths, leading to higher systematic uncertainties for TOC calculation. The instrument's performance is also affected by the detection threshold at lower irradiance levels.
1：Experimental Design and Method Selection:
The BTS2048-UV-S series array spectroradiometer was designed based on the Czerny–Turner spectrometer design, incorporating a temperature-controlled back-thinned Hamamatsu CCD detector and a filter wheel for stray-light reduction.
2：Sample Selection and Data Sources:
Direct solar irradiance measurements were conducted at the Iza?a Atmospheric Observatory in Tenerife during an international total ozone measurement intercomparison.
3：List of Experimental Equipment and Materials:
The instrument includes a silicon carbide (SiC) photodiode, a filter wheel with up to six different optical filters, and is mounted on a solar tracker.
4：Experimental Procedures and Operational Workflow:
Measurements were performed using the solar bandpass correction method, with spectra recorded every 8 s.
5：Data Analysis Methods:
TOC values were calculated using a retrieval algorithm based on ratios of wavelength bands and compared to model values from a lookup table generated with the libRadtran software package.
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