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Related Experiment Video

Updated: Jun 15, 2026

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Water vapor differential absorption lidar development and evaluation.

E V Browell, T D Wilkerson, T J McIlrath

|March 11, 2010

Summary

This summary is machine-generated.

A new ground-based differential absorption lidar (DIAL) system accurately measures vertical water vapor profiles. This laser-based technology shows promise for future atmospheric research and remote sensing applications.

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Area of Science:

Atmospheric Science
Remote Sensing
Optical Engineering

Background:

Accurate measurement of atmospheric water vapor is crucial for weather forecasting and climate studies.
Traditional methods like rawinsondes have limitations in spatial and temporal resolution.
Differential Absorption Lidar (DIAL) offers a promising remote sensing technique for profiling water vapor.

Purpose of the Study:

To describe a newly developed ground-based differential absorption lidar (DIAL) system for vertical water vapor measurements.
To validate the DIAL system's performance by comparing its measurements with rawinsonde data.
To assess the accuracy of theoretical simulations for predicting DIAL system errors.

Main Methods:

Utilized a ruby-pumped dye laser system operating at a specific water vapor absorption line (724.372 nm).
Simultaneously transmitted ruby laser output for atmospheric scattering and attenuation characterization.
Employed a 0.5-m telescope and photomultiplier tubes for detecting backscattered laser light.

Main Results:

The DIAL system successfully measured vertical water vapor concentration profiles at night.
Measurements showed agreement with rawinsonde data within the rawinsonde's uncertainty up to 3 km altitude.
Theoretical simulations accurately predicted the random error of the DIAL measurements.

Conclusions:

The ground-based DIAL system is a reliable tool for vertical water vapor profiling.
Simulation results provide a strong basis for designing future airborne and spaceborne DIAL systems.
This technology has significant potential for advancing atmospheric research and monitoring.