Observational Studies On Solar Spectra In Tibet

Sunlight is the light of life on the earth.According to the history of life evolution,UV irradiance among the solar spectrum created the first single celled organism on the earth.The photosynthesis of visible light(photosynthetically active irradiance)in the solar spectrum creates the earth's plant life,and the infrared light in the solar spectrum provides heat energy to the earth's organisms.Today,according to the characteristics of the solar spectra,various solar cellsmatching the spectral characteristics have been developed to protect the earth's ecology and to provide green and clean energy.The ground solar spectrum records the distribution information of ground solar light intensity with wavelength,and then one can retrieve the influence information for all objects(organisms,materials,atmosphere,etc.)interacting with the spectral characteristics.Therefore,the observation studies of ground solar spectra provides field observation information for many fields such as biology,ecology,solar energy application,meteorology and climatology,etc.The Qinghai Tibet Plateau plays an important role as a barrier to national ecological security,Tibet is the main body of the Qinghai Tibet Plateau.At the present,due to the influence of natural and human activities,the Qinghai Tibet Plateau presents problems such as the decrease of ecosystem stability and the increase of atmospheric environmental pressure.For the current problems,the state has put forward the policy on strengthening the protection of the national ecological security barrier for the Qinghai Tibet Plateau,which requires strengthening the basic research on the effect of atmospheric environment change on the ecological barrier on the Qinghai Tibet Plateau,and establishing the dynamic monitoring system for the ecological barrier function.The observation of ground solar spectrum in Tibet has important practical application value for the research and application in the above related fields in Tibet.As the main body of the Tibetan Plateau,it plays an important role in the ecological security of the Tibetan Plateau.At present,due to the influence of natural and human activities,the Qinghai Tibet Plateau presents problems such as the decrease of ecosystem stability and the increase of atmospheric environmental pressure.In view of the current problems,the state has put forward the policy of strengthening the protection of the national ecological security barrier on the Qinghai Tibet Plateau,which requires strengthening the basic research on the effect of atmospheric environment change on the ecological barrier on the Qinghai Tibet Plateau,and establishing the dynamic monitoring system of ecological barrier function.The observation of ground sunlight spectrum in Tibet has important practical application value for the research and application in the above related fields in Tibet.This research work is based on the observation of the ground solar spectrum of six populated areas in Tibet(Lhasa,Nyingchi,Naqu,Shigatse,Dingri and ALI).Two international spectrometers are used in this work.Ramses-acc-vis(observation wavelength range: 320 ? 950 nm,wavelength accuracy: 0.3nm);Solar spectrometer(solarsim-g)produced in Canada(wavelength range: 280-1200 nm,wavelength accuracy: 0.1nm).Both spectrometers were purchased in 2019,and the manufacturer made absolute calibration when purchasing.During the observation period,calibrate the instrument regularly,set the measurement interval of the instrument to one minute,and process and analyze the observation data by using data analysis software such as MATLAB and python;Field data of solar spectrum in Tibet(for one year)were obtained by observation;The surface solar spectrum in Tibet recorded the content characteristics of greenhouse gases in the atmosphere.The spectral characteristics of annular eclipse in Tibet were observed for the first time.Discover the temporal and spatial variation of solar spectrum in Tibet.