Abstract
Abstract. Aerosol measurements have been carried out at Kolhapur (16°42′N, 74°14′E) by using newly designed Semiautomatic Twilight Photometer. The system is a ground based simple and inexpensive but very sensitive passive remote sensing technique. The altitudes of the Junge layer peaks on measurement days were derived from the aerosol vertical profiles. One attempt is made to examine the association between oscillations of the stratospheric aerosol layer peaks and different types of clouds. The values of AND for the Junge layer peaks for each observational day were also calculated. The graph between AND at peak point of Junge layer and day numbers was also studied in comparison with High, Medium and Low level clouds. There is an annual variation in the altitude of the peak of Junge layer also. Its maximum is observed during January. The annual variation of the altitude of the peak of Junge layer and the AND of Junge layer peak showed opposite phase relation.
Highlights
Atmospheric aerosols are the suspension of fine solid particles or liquid droplets in air
The association between oscillations of the stratospheric aerosol layer peaks and different types of clouds was examined in this study
Medium and low level cloudy days noted down and they were included in this graph
Summary
Atmospheric aerosols are the suspension of fine solid particles or liquid droplets in air. In the present work aerosol measurements have been carried out at Kolhapur (16°42′N, 74°14′E) by using newly designed Semiautomatic Twilight Photometer during the period 1 January 2009 to 30 December 2011 to study the vertical distribution of the stratospheric aerosol number density per cm[3] (AND) (Here after aerosol number density per cm[3] is abbreviated as AND). The stratospheric aerosol layer was first measured in the late 1950s using balloon-borne impactors (Junge et al 1961a and Junge et al 1961b) and is often called the Junge layer, its existence was suggested 50 years earlier from twilight observations (Gruner et al 1927) These particles are composed of sulfuric acid and water and are formed by the chemical transformation of sulfur-containing gases. It is able to give the information of aerosols in the atmosphere up to higher altitudes (from 6 km to 350 km)
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