Estimation of background gas concentration from differential absorption lidar measurements

Differential Absorption Lidar (DIAL) Measurements of Landfill Methane Emissions

Methane is one of the most important gaseous hydrocarbon species for both industrial and environmental reasons. Understanding and quantifying methane emissions to atmosphere is therefore an important element of climate change research. Range-resolved infrared differential absorption Lidar (DIAL) measurements provide the means to map and quantify a wide range of different methane sources. This p...

Error reduction methods for integrated-path differential-absorption lidar measurements.

We report new modeling and error reduction methods for differential-absorption optical-depth (DAOD) measurements of atmospheric constituents using direct-detection integrated-path differential-absorption lidars. Errors from laser frequency noise are quantified in terms of the line center fluctuation and spectral line shape of the laser pulses, revealing relationships verified experimentally. A ...

Analysis of Range Measurements From a Pulsed Airborne CO2 Integrated Path Differential Absorption Lidar

Determining the CO2 column abundance from an integrated path differential absorption (IPDA) lidar requires accurate knowledge of the range to the scattering surface, i.e., the column height. We have adapted and tested a ranging algorithm for the airborne IPDA CO2 lidar designed at the NASA Goddard Space Flight Center, and have evaluated its accuracy and precision. We applied a quasi-maximum-lik...

Lidar Backscattering Measurements of Background Stratospheric Aerosols

Estimation of Cloud Droplet Concentration from Radar, Lidar and Microwave Radiometer Measurements

In 1996 and 1998, measurement campaigns have taken place in the Netherlands and the United Kingdom, respectively. A variety of collocated instruments performed measurements on the clouds. Among the instruments were a microwave radiometer, lidars and radars. Also, particle size measuring probes were operated during flights through the clouds. Estimates of the microphysical properties of clouds m...