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Updated: May 16, 2026

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
Published on: July 26, 2024
Airborne measurements of atmospheric methane column abundance using a pulsed integrated-path differential absorption
Haris Riris1, Kenji Numata, Steve Li
1NASA, Goddard Space Flight Center, Science and Exploration Directorate, Greenbelt, Maryland 20771, USA. haris.riris@nasa.gov
Abstract:
We report airborne measurements of the column abundance of atmospheric methane made over an altitude range of 3-11 km using a direct detection integrated-path differential-absorption lidar with a pulsed laser emitting at 1651 nm. The laser transmitter was a tunable, seeded optical parametric amplifier pumped by a Nd:YAG laser, and the receiver used a photomultiplier detector and photon-counting electronics. The results follow the expected changes with aircraft altitude, and the measured line shapes and optical depths show good agreement with theoretical calculations.
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