EOL Seminar: Ground-based eye-safe networkable micro-pulse differential absorption lidar (DIAL) for thermodynamic profiling in the lower troposphere

Date: 
Friday, January 18, 2019 - 14:15
Location: 
FL2 - 1022
Contact Name: 
Mike Reeves
Contact Email: 
Contact Phone: 
303-497-1029

Dr. Kevin S. Repasky
Montana State University

The importance of thermodynamic profiling has been underscored by a series of National Research Council (NRC) reports as well as a report to the National Science Foundation and National Weather Service. A recent review article details the state of remote sensing of lower tropospheric thermodynamic profiles. In this review paper, it was demonstrated that huge observational gaps exist with respect to thermodynamic profiling in the lower troposphere, and low-cost ground-based passive and active remote sensing systems are suggested as the best means to close these observational gaps.
In an effort to develop low-cost ground based active remote sensing instruments to address the needs of the science community, researchers at Montana State University (MSU) and the National Center for Atmospheric Research (NCAR) have developed an eye-safe diode laser based (DLB) micro-pulse differential absorption lidar (MP-DIAL) for water vapor profiling in the lower troposphere. Currently, two MP-DIAL instruments are operational and have been deployed at the Front Range Air Pollution and Photochemistry Experiment (FRAPPE), the Plains Elevated Convection at Night (PECAN) experiment, the Perdigão experiment, and the Land Atmosphere Feedback Experiment (LAFE). For each of these field experiments, the MP-DIAL was run unattended and provided near-continuous water vapor profiles from 300 m above the ground level to 4 km (or the cloud base) with 150 m vertical resolution and 5 minute temporal resolution. Three additional MP-DIAL instruments are currently under construction and will result in a network of five MP-DIAL instruments for ground based weather and climate research experiments. Taking advantage of the broad spectral coverage and modularity of the DLB MP-DIAL architecture, a high spectral resolution lidar (HSRL) has been developed at NCAR for aerosol profiling and work has begun on the development of a DIAL instrument for temperature profiling in the lower troposphere.

In this talk, an overview of the DLB MP-DIAL technique will be presented. The talk will include a discussion on the development and current status of the MP-DIAL for water vapor profiling and including data from recent field experiments. Furthermore, the status of the development of the MP-DIAL for temperature profiling will be discussed.

Tuesday, 29 May 2018, 3:30 PM
Refreshments 3:15 PM
NCAR-Foothills Laboratory • 3450 Mitchell Lane
Bldg 2 Large Auditorium (Rm1022)
Webcast: https://ucarconnect.ucar.edu/live (Room 2: FL2-1022)