A calibration method for measuring aerosol light absorption coefficient with a black carbon meter
A technology of absorption coefficient and correction method, which is applied in measuring devices, color/spectral characteristic measurement, instruments, etc., can solve problems such as large deviations, achieve high precision, expand application range, and be difficult to maintain.
Active Publication Date: 2021-12-17
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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However, the correction parameters obtained by these correction methods are all obtained under the conditions of specific aerosol types, etc. When it needs to be extended to different scenarios, only fixed correction parameters can be used to correct b ATN，n，i A correction is made that ignores the large differences in the contribution of different aerosol types to the optical signal and thus produces a large bias
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[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings. Wherein, the same parts adopt the same reference numerals.
[0043] As mentioned in the background art, in the prior art, the accuracy of measuring the aerosol absorption coefficient by black carbon meter is not high. For example, in figure 1 In the schematic diagram shown, the in-situ absorbance coefficient b as a standard reference insitu，n，i They can almost be connected to form a horizontal straight line, indicating that the actual absorptivity of the aerosol should be relatively stable. However, the light attenuation ATN displayed by the triangle point measured by the black carbon meter n，i Converted black carbon meter absorbance coefficient b ATN，n，i , but there is a considerable difference, and there is an obvious jump in...
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The invention discloses a method for correcting the aerosol light absorption coefficient measured by a black carbon meter, which comprises the following steps: obtaining the light attenuation ATN of the i-th measurement under the n-th period corresponding to the λ band by measuring the black-carbon meter n,i (λ), calculate and obtain the black carbon instrument absorptivity b corresponding to the nth period of the lambda band and the ith measurement ATN,n,i (λ); by shading correction parameter and scattering correction parameter, to the above-mentioned black carbon instrument absorptivity b measured ATN,n,i (λ) is corrected to obtain the corrected absorption coefficient b corresponding to the nth period of the λ band cor,n,i (λ). The correction method of the present invention introduces two correction parameters that do not depend on additional "standard" equipment, so it does not need to rely on additional calibration equipment, and can be dynamically applied to the measurement of various aerosol absorption coefficients under different environmental conditions, expanding the black Application range of carbon meter.
Description
technical field [0001] The invention relates to the measurement of atmospheric parameters in the field of environmental protection, in particular to a method for measuring the aerosol light absorption coefficient with a black carbon meter, and in particular to a correction method for measuring the aerosol light absorption coefficient with a black carbon meter. Background technique [0002] Atmospheric aerosols have a significant impact on the Earth's energy budget. According to the Fifth Intergovernmental Panel on Climate Change Assessment Report on Climate Change, the overall radiative forcing by aerosols is -0.9W m -2 , but uncertain range up to (-1.9W m -2 to -0.1Wm -2 ). One of the reasons for such a high uncertainty is the inability to accurately measure the true aerosol absorptivity. [0003] At present, there are generally two methods for measuring the absorptivity of aerosols. One is to use a photoacoustic spectrometer to directly measure the aerosol to obtain th...
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IPC IPC(8): G01N21/31G01N21/27
CPCG01N21/31G01N21/274
Inventor 张宇哲支国瑞刘世杰靳文静王镭李正映薛志钢杜谨宏张玮琦任岩军曹晴
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI