In a number of measurement scenarios it is necessary to operate a lidar in remote sites with a minimum personnel attendance on the spot. This requires a stability of operation, automatic functioning and remote control of the instrument status, and data downloading. Such backscatter/depolarisation lidar is realised by Observatory of Neuchatel and was operated for one year in Basel, Switzerland as part of Urban Boundary Layer study (BUBBLE project). The lidar is optimal for measurements at altitudes of planetary boundary layer (PBL) and troposphere. The operation was remotely controlled via internet from the premises of Observatory of Neuchatel. The lidar measurements covered a large number of the diurnal cycles of PBL development. We present a brief description of the lidar and its operation. We also present a preliminary results for PBL diurnal cycle measurements. These results include: determination of the aerosol mixed layer height using the altitude derivative of the lidar backscatter range-corrected signal and determination of the aerosol backscatter coefficient with a lidar signal inversion procedure.
Backscatter lidar measurements were performed in the atmospheric boundary layer and the troposphere above Neuchatel, Switzerland (47.00°N, 6.95°S, 485m asl). The backscatter lidar is based on Nd:YAG laser. The lidar measurements are done in the period from June 2000 till February 2002 as part of the EU project EARLINET (http://lidarb.dkrz.de/earlinet/). From the lidar measurements, we determine the following values vertical profile of the aerosol backscatter coefficients, the gradient of the range-corrected lidar signal and the variance of the range-corrected lidar signal. These values are used to determine the aerosol mixed layer (AML) height in the atmospheric boundary layer (ABL). In this work, we present a comparison of these different lidar methods to determine the AML height. The lidar-obtained values are also compared with the values for ABL top, as determined from upper air weather parameters. This comparison is performed and presented for various seasons and time in the diurnal cycle.
Conference Committee Involvement (1)
Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing
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