Effect of Cirrus Cloud on the Measurement of Atmospheric Optical Thickness with Novel Photometer

Abstract

Abstract: Based on an automatic and fast variable field solar photometer (VFOVSP) developed, the fast measurement of solar radiation
in different fields of view is realized, which provides a new technical means for distinguishing aerosol particles from
cloud particles for ground measurement. The novel photometer adopts the sun tracking technology based on CCD image sensor
and a programmable variable fields aperture, which can realize the rapid measurement of different fields of view in a
short time interval. Through preliminary analysis of the measurement data of different fields of view under different
weather conditions, it is shown that the way of comparing the changes in atmospheric optical thickness measured in
different fields of view can provides a new technology of distinguishing thin cloud and aerosol. This method can
quickly identify whether cirrus cloud exist in current atmospheric environment, which provides a foundation for
studying the characteristics of cirrus cloud.

Key words: novel photometer, different fields of view, atmospheric optical thickness, cirrus clouds recognition

CLC Number:

P412

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