In order to initially explore the different temporal and spatial distribution characteristics of sulfur dioxide (SO2) and nitrogen dioxide (NO2) concentrations in Huainan, the gas concentration detections were carried out at Huainan Academy of Atmospheric Sciences by the differential absorption laser radar system of Anhui Institute of Optics and Fine Mechanics. According to the detected distribution profiles of atmospheric SO2 and NO2 concentrations in part of the months from July 2016 to June 2017, in this paper, the typical examples are selected to analyze the distribution characteristics of SO2 and NO2 from three aspects: diurnal variations of horizontal concentration, vertical concentration changes and monthly variations of horizontal concentration. According to the SO2 and NO2 concentration distribution profiles in the selected examples, the following conclusions can be drawn:(1) The concentrations of SO2 and NO2 at night are greater than that of SO2 and NO2 in the afternoon on the same day;(2) The vertical concentrations of SO2 and NO2 decrease with the increasing height;(3) The monthly variations of SO2 and NO2 horizontal concentration are the highest in the winter months, and the lowest in the summer months, followed by the spring and autumn months. The changes in SO2 and NO2 concentrations are the result of a combination of population activities and changes in meteorological conditions.
With two sets of experimental instruments, laser transmission was investigated through horizontal atmosphere at 1.06 m under fine and haze-fog events. One set of the instruments is an indirect transmission meter used to measure visibility and the other one is a direct transmission meter used to measure the attenuation of laser power. Results show that the variation of transmittance got from laser power (Tp) and that obtained by visibility (Tvis) are highly correlated. For relative humidity (RH) below 85%, the curve of Tvis fits that of Tp very well. While the RH is above 85%, the Tvis is more likely smaller than Tp under fine meteorological condition, but under haze-fog condition Tvis is larger than Tp on the contrary. For different weather condition, the relation efficient between extinction coefficient and visibility is different. Even for similar visibility, the extinction coefficient of haze-fog event is larger than that of fine event.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.