研究目的
To investigate the atmospheric broadband transmission properties of clouds, aerosols, and ozone in different spectral regions (EUV, TUV, GS) using ground-based measurements in Seoul, Korea, and to evaluate their wavelength dependence and the influence of meteorological parameters.
研究成果
The study concludes that clouds have the dominant effect on reducing atmospheric transmission, with overcast conditions causing significant reductions. Annual average transmissions decrease with increasing wavelength, but monthly variations show opposite dependencies due to high total column ozone, with a critical value of 370 DU identified. Ozone plays a key role in wavelength-dependent effects, more so than aerosols and clouds. Enhancements in transmission occur under partial cloud cover, more frequently at shorter wavelengths.
研究不足
The study is limited to one location (Seoul, Korea), which may not represent global conditions. The harmonic model for clear-sky irradiance is empirical and may not account for all atmospheric variables. Enhancements in transmission due to cloud edges were observed but not fully explained. Further radiative transfer modeling is needed to clarify results.
1：Experimental Design and Method Selection:
The study used ground-based measurements from instruments in Seoul, Korea, over 9 years. Harmonic analysis was employed to model clear-sky irradiance as a reference. Atmospheric transmission was defined as the ratio of measured solar radiation to clear-sky irradiance, with corrections for cloud cover, aerosol optical depth, and total column ozone using radiation amplification factors.
2：Sample Selection and Data Sources:
Daily data from March 2004 to February 2013 were used, including solar irradiance in EUV, TUV, and GS regions, cloud cover amount, aerosol optical depth at 320.1 nm, and total column ozone. Data were sourced from instruments at Yonsei University and the Korea Meteorological Administration.
3：1 nm, and total column ozone. Data were sourced from instruments at Yonsei University and the Korea Meteorological Administration.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Dobson spectrophotometer (Beck #124), Brewer spectrophotometer (SCI-TEC Instruments Inc. model MKIV #148), Kipp & Zonen CM21 pyranometer, Campbell Scientific CR21X data loggers, mercury lamps, standard lamps (tungsten halogen, 50 W), solar tracker.
4：Experimental Procedures and Operational Workflow:
Instruments were calibrated regularly. Solar irradiance was measured at specific wavelengths and integrated for broadband values. Data were collected daily, with corrections applied to isolate the effects of clouds, aerosols, and ozone. Transmission was calculated and analyzed for annual and monthly averages.
5：Data Analysis Methods:
Statistical analysis of transmission values, grouping by cloud cover, aerosol optical depth, and total column ozone categories. Harmonic analysis for clear-sky modeling, and use of radiation amplification factors for corrections.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
