Abstract
The combined use of remote sensing and in-situ monitoring instruments could help improve the assessment of near-surface aerosol properties. In this paper, we analyze the diurnal behavior of aerosol extinction coefficients, αExt(λ), at λ=349 and 550 nm using a lidar and a present weather detector, respectively. We utilize the aerosol optical thickness (AOT), single scattering albedo (SSA), and Ångström exponent (AE) from SKYNET sky radiometer, and AE from aethalometer, and the number distribution from optical particle counter to evaluate the effect of relative humidity (RH) on aerosol extinction coefficients. It is found that although αExt(λ) often exhibits a positive correlation with the ambient RH, this relation is obscured when both the number distribution and particle size change simultaneously. Moreover, αExt at 349 nm is more sensitive to this change than at 550 nm.
Highlights
Aerosol plays an important role in the Earth climate change
We examine the diurnal behavior of aerosol extinction coefficient by focusing on the lower troposphere where most of the sources and sinks of aerosol are located
In the early morning with a constant high relative humidity (RH) (~90%), a decreasing trend is seen for αExt,Lidar (349 nm), while almost no change in αExt,PWD (550 nm)
Summary
Aerosol plays an important role in the Earth climate change. One parameter that controls visual air quality is the aerosol extinction coefficient. We examine the diurnal behavior of aerosol extinction coefficient by focusing on the lower troposphere where most of the sources and sinks of aerosol are located. The values of aerosol extinction coefficient, αExt (λ), are derived from a lidar system with a low elevation angle and a visibility meter. They are related to other aerosol optical properties, particle size and number distribution. Synergetic use of the data from these remote sensing and sampling instruments could help improve the assessment of aerosol radiative forcing to climate [1,2]
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