AI Summary & Key Takeaways
AI InsightIt issuggested that the 3-factor empirical models are selected firstly for the calibration, and the better understandingof the physical and chemical processes in the atmosphere.
📌 3 Key Takeaways
Özet
Solar spectral and direct radiation, and biogenic volatile organic compound (BVOC) emissions were measured ina temperate forest, China in the 2010 and 2011 growing seasons. The principle of energy balance above canopylevel was used to develop solar radiation empirical model. Three main processes of radiative transfer in theatmosphere, attenuation by BVOCs, absorption and scattering by gases, liquids, and particles (GLPs) wereconsidered. Simulated solar radiation agreed with observations at the ground and the top of the atmosphere(TOA). Based on solar irradiance in different wavelength regions measured and estimated using empirical modelat TOA, the calibrations of solar radiometers were made. 3-factor and 2-factor empirical models of solar radiation were used for calibrations at different situations. The sensitivity analysis showed that solar global radiation was more sensitive to changes in scattering factor (S/Q, solar scattering to global radiation) than to watervapor and BVOCs. This method can be used to calibrate all kinds of solar radiometers with some advantages. It issuggested that the 3-factor empirical models are selected firstly for the calibration, and the better understandingof the physical and chemical processes in the atmosphere.