A high spectral resolution lidar for untended operation in the Arctic.

Global climate models suggest that the arctic climate may be particluarly sensitive to perturbations caused by the increase of green house gases. Global climate models show large variations in the predicted arctic cloud cover. Model development is currently hampered by a lack of data on the optical properties of arctic clouds and hazes.

The University of Wisconsin High Spectral Resolution Lidar(HSRL)provides vertical profiles of optical depth, backscatter cross section, depolarization and backscatter phase functions. All measurements are absolutely calibrated by reference to molecular scattering which is measured at each point in the lidar profile. This paper describes a new version of of the HSRL currently under construction which is designed for untended operation in the Arctic. This system will be packaged in a "phone booth' size container instead of the 46' semi-trailer required by the current instrument. A major redesign of the optical system and the introduction of extensive computer control will eliminated the need for a highly trained on-site operator. The system will be controlled remotely via an internet connection which will also transport data to an online computer archive.

This paper will describe the new insturment and, using data obtained from the current HSRL, we will present examples of the the observations expected from the new system.