A Ground-Based Profiling Differential Absorption LIDAR System for Measuring Carbon Dioxide in the Planetary Boundary Layer

Computer Science – Performance

Scientific paper

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0315 Biosphere/Atmosphere Interactions, 0322 Constituent Sources And Sinks, 0345 Pollution: Urban And Regional (0305), 0394 Instruments And Techniques, 0400 Biogeosciences

Scientific paper

Ground-based LIDAR observations have the potential to provide continuous profiles of carbon dioxide through the planetary boundary layer and into the free troposphere. Such measurements would reduce biases in estimates of surface fluxes associated with the diurnal and seasonal "rectifier" effects and would provide a powerful tool for validation of future satellite measurements of carbon dioxide. We will present initial atmospheric measurements from a prototype system that is based on components developed by the telecommunications industry. Preliminary measurements and instrument performance calculations indicate than an optimized differential absorption LIDAR (DIAL) system will be capable of providing continuous hourly averaged profiles with 250m vertical resolution and better than 1 ppm precision at 1 km. Precision increases (decreases) at lower (higher) altitudes and is directly proportional to altitude resolution and acquisition time. Thus, precision can be improved if vertical and temporal resolution are sacrificed. Our approach meassures absorption by carbon dioxide of pulsed laser light near 1.58 microns backscattered from atmospheric aerosols. Aerosol concentrations in the planetary boundary layer are relatively high and are expected to provide adequate signal returns for the desired resolution. The long-term goal of this project is to develop a prototype of a rugged, autonomous system using commercial components, which can be replicated and deployed in a monitoring network.

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