Open-path Dual-Comb Spectroscopy Observations of Greenhouse Gas Spatial and Temporal Variability over Km-scale Paths

James Kasic; Nathan Malarich; Griffin Mead; Esther Baumann; Saad Syed; Brian Washburn; Kevin Cossel; Ian Coddington

doi:10.1051/epjconf/202636209005

Open Access

Issue		EPJ Web Conf. Volume 362, 2026 31^st International Laser Radar Conference (ILRC 31) Held Together with the 22^nd Coherent Laser Radar Conference (CLRC 22)


Article Number		09005
Number of page(s)		3
Section		Lidar Measurements of Trace Gases (including Greenhouse Gases and Water Vapour)
DOI		https://doi.org/10.1051/epjconf/202636209005
Published online		09 April 2026

EPJ Web of Conferences 362, 09005 (2026)
https://doi.org/10.1051/epjconf/202636209005

Open-path Dual-Comb Spectroscopy Observations of Greenhouse Gas Spatial and Temporal Variability over Km-scale Paths

James Kasic^(a)^,(b)^,(c)*, Nathan Malarich^(a), Griffin Mead^(a), Esther Baumann^(a)^,(b), Saad Syed^(a), Brian Washburn^(a), Kevin Cossel^(a) and Ian Coddington^(a)

^(a) National Institute of Standards and Technology, Spectrum Testing and Research Division, Boulder, CO 80305
^(b) University of Colorado, Boulder, Department of Physics, Boulder, CO 80309
^(c) University of Colorado, Boulder, Department of Atmospheric and Oceanic Science, Boulder, CO 80309 Author e-mail address: This email address is being protected from spambots. You need JavaScript enabled to view it.

Published online: 9 April 2026

Abstract

A dual-comb spectrometer is deployed for kilometer scale open-path measurements of CO₂ and CH₄ at building-top heights in Manhattan, New York City. The system operated for more than 3 months in summer 2023 and more than 1 month in winter 2024. The measurements show the high spatial and temporal variability of greenhouse gas emissions in an urban setting.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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