By using the direct solar radiation data measured by a CE-318 sun photometer in Inner Mongolia during the period between June 2002 and May 2003,the aerosol optical thickness(AOT) and size distribution were retrieved by extinction method.
Based on measurements on 936nm water-vapor band and 870nm atmospheric window band for CE318 sun photometer,A method of water vapor amount estimation by an improved Langley plot is presented. Calibration of CE318 sun photometer and calculation of water vapor amount are also described.
By using the direct solar radiation data measured by CE-318 sun photometer in Inner Mongolia during the period between June 2002 and May 2003, the aerosol optical thickness (AOT) and size distribution were retrieved by extinction method. The radiative properties including scattering efficiency, single scattering albedo (SSA), extinction coefficient were analyzed.
Two methods of atmospheric column water vapor content retrieval from 940nm NIR and adjacent bands of CE318 sun photometer based on water vapor absorption in this region are introduced. They are respectively modified Langley Plot and ratio method.
The application of CMOS image sensors ADCS-2121 is used in full automatic portable sun photometer to introduce the application of CMOS image sensors in pointing of optical system, and compared with traditional method that choosing quarter sensor as facular detector.
In this paper, the calibration of sun photometer, the calculation of atmospheric aerosol optical thickness and the Angstrom parameters a and β obtained from aerosol optical thickness are discussed.
The atmospheric parameter is necessary for atmospheric correction algorithm of satellite on the sea, and the accuracy of measuring data of hand held sun photometer is main approach to derive the atmospheric parameter.
The techniques of retrieving aerosol optical depth from EOS MODIS was introduced first, then our several recent research works with MODIS were summarized, including calibrating the MODIS 10 km Level 2 products of NASA by our surface sun photometer observations, analyzing the aerosol distribution patterns over China, remote sensing high resolution (1km) aerosol optical depth products and applying the aerosol products on studying the air pollution problems.
However, for exceptional very clear days having maximum actinometric intensity of the solar radiation the sensitivity of the microamperimeter in theVolz sun photometer fails.
Turbidometric estimations in Mexico city using the Volz sun photometer
Of the 9 filters, 4 were not included in the standard equipment of the sun photometer.
A sun photometer fitted with 9 narrowband interference filters from 368 nm to 1024 nm was used to determine the aerosol optical depth at 8 measuring stations in Europe.
Measurements of the spectral aerosol optical depth using a sun photometer
Error analysis and correction is applied to a specific multi-wavelength sun-photometer, which is used for aerosol remote sensing at four locations in China. The results show that instrument calibration, filter bandwidth, gas absorption, etc. can bring serious errors. Several methods are used to correct these kinds of errors, especially a" three band method" is put forward to reduce the errors brought by water vapor. After the correction, it is shown that the relative error is no larger than 10% for...
Error analysis and correction is applied to a specific multi-wavelength sun-photometer, which is used for aerosol remote sensing at four locations in China. The results show that instrument calibration, filter bandwidth, gas absorption, etc. can bring serious errors. Several methods are used to correct these kinds of errors, especially a" three band method" is put forward to reduce the errors brought by water vapor. After the correction, it is shown that the relative error is no larger than 10% for very clear condition and is about 2% for medium turbidity.
The method of remote sensing aerosols using MODIS data is introduced. The aerosol products from MODIS are compared with the results from the sun photometer observations at Peking University. The two data series fit very well with high correlations. Some pictures are shown which described the aerosol optical depth (AOD) distribution over Beijing. We found that the remote sensing from space had provided us a new way to understand the regional air pollution better, and the AOD data from satellite observations...
The method of remote sensing aerosols using MODIS data is introduced. The aerosol products from MODIS are compared with the results from the sun photometer observations at Peking University. The two data series fit very well with high correlations. Some pictures are shown which described the aerosol optical depth (AOD) distribution over Beijing. We found that the remote sensing from space had provided us a new way to understand the regional air pollution better, and the AOD data from satellite observations filled up the shortcoming of the data from ground observations with limited spatial coverage. Aerosol data from space are useful not only to the research on global and regional climate but also to the analysis of urban pollution.
Aerosol optical depths were measured by a sun photometer from July 2000 to July 2001 in the Beijing urban area. The direct solar radiation data for 50 days were acquired in the measurements. Estimation of aerosol optical parameters, such as the aerosol optical depth and Junge parameters and atmospheric coefficients, is conducted, and the characteristics of air particle distribution in different weather conditions in Beijing are given. Analysis shows that the measurements are very important for analyzing...
Aerosol optical depths were measured by a sun photometer from July 2000 to July 2001 in the Beijing urban area. The direct solar radiation data for 50 days were acquired in the measurements. Estimation of aerosol optical parameters, such as the aerosol optical depth and Junge parameters and atmospheric coefficients, is conducted, and the characteristics of air particle distribution in different weather conditions in Beijing are given. Analysis shows that the measurements are very important for analyzing and monitoring air pollution in the Beijing urban area.
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