National Weather Center Colloquium

NCAR’s New Water Vapor Differential Absorption Lidar

Dr. Tammy Weckwerth

National Center for Atmospheric Research

10 November 2015, 4:00 PM

National Weather Center, Room 1313
120 David L. Boren Blvd.
University of Oklahoma
Norman, OK

The talk will begin with a brief overview of the NCAR’s instrumentation available to NSF PIs via the Deployment Pool. The bulk of the presentation will focus on a new water vapor DIfferential Absorption Lidar (DIAL) that was created to profile water vapor within the lowest levels of the atmosphere. Although there are some limitations, this new instrument provides advantages over other water vapor measuring techniques, such as radiosondes, Atmospheric Emitted Radiance Interferometers (AERIs), microwave profiling radiometers, Raman lidars, GPS receivers and satellite retrievals. Recent significant advances in the DIAL were accomplished through creative engineering upgrades. The instrument is now able to accurately obtain: i) continuous, unattended water vapor profiles, ii) data closer to the ground, and iii) profiles during the day and in the presence of bright clouds. A brief history of the instrument development will be presented. Intercomparisons with data from other instruments obtained during field campaigns FRAPPE (Colorado 2014) and PECAN (Kansas 2015) illustrate the relative error and operating limitations of the DIAL. Data examples will be shown to highlight potential applications for this exciting and unique instrument.

Speaker bio

National Weather Center Colloquium Seminar Series website