Title
A Novel Lidar Ceilometer (Springer Theses),Used
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In this thesis, a new lidar (light detection and ranging) ceilometer capable of monitoring cloud base and sensitive to boundary layer aerosols is introduced. The key to this novelty lies in its dividedlens design that addresses a classical lidar problem of balancing transmitterreceiver overlap and signaltonoise ratio, along with a method for characterizing overlap in the laboratory. Enhanced sensitivity in the nearrange of the instrument is achieved without compromising signaltonoise in a design that is straightforward to manufacture for broad deployment. The instrument, its optical characterization, and its performance in the field are described. The prototype instrument described here has since formed the basis of a commercial sensor for monitoring clouds and aerosols.Highresolution, continuous observations of clouds and aerosols are needed to reduce the large uncertainties in our current understanding of their influence on climate that have been highlighted by the International Panel on Climate Change. And as international health organizations indicate growing public health threats over the coming decades resulting from poor air quality, extensive aerosol monitoring is required to assess personal exposure to and the health impacts of anthropogenic particulates. Groundbased optical remote sensing measurements made by wellcharacterized instruments, such as that described in these pages, are critical to this.
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