Multi-Frequency Differential Absorption LIDAR (DIAL) System for Aerosol and Cloud Retrievals of CO2/H2O and CH4/H2O

Published

December 1, 2023

Author(s)

Jasper Stroud, Gerd Wagner, David Plusquellic

Abstract

We discuss a remote sensing system that is used to simultaneously detect range-resolved differential absorption LIDAR (light detection and ranging; DIAL) signals and integrated path DIAL signals (IP-DIAL) from aerosol targets for ranges up to 22 km. The DIAL/IP-DIAL frequency converter consists of a 1.6 μm OPO pumped at 1064 nm and operating at 100 Hz pulse repetition frequency. The probe light is free space coupled to a movable platform that contains one transmitter and two receiver telescopes. Hybrid photon current/counting systems increase the dynamic range for detection by two orders of magnitude. Range resolved and column integrated dry-air mixing ratios are obtained from line shape fits of CO2 and CH4 centered at 1602.2 nm and 1645.5 nm, respectively and measured at 10 different frequencies over a ≈ 1.5 cm-1 bandwidth. The signal-to-noise ratios (SNR) of the cloud averaged IP-DIAL returns approach 1000:1 and the uncertainties in the weighted mixing ratios over the cloud segments range from 0.1 % to 1 %. The IP-DIAL mixing ratios are in good agreement with the range averaged DIAL mixing ratios at the 1 % to 2 % level for both CO2 and CH4. These results can serve as a validation method for future active and passive satellite observational systems.

Citation

Remote Sensing

Volume

15

Issue

23

Pub Type

Journals

Download Paper

https://doi.org/10.3390/rs15235595

Local Download

Keywords

DIAL, differential absorption lidar, IPDA, integrated path differential absorption LIDAR, cloud retrievals

Citation

Stroud, J. , Wagner, G. and Plusquellic, D. (2023), Multi-Frequency Differential Absorption LIDAR (DIAL) System for Aerosol and Cloud Retrievals of CO2/H2O and CH4/H2O, Remote Sensing, [online], https://doi.org/10.3390/rs15235595, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956685 (Accessed March 8, 2025)