Moreno Oyervides, Aldo LuisBonilla Manrique, Óscar ElíasGarcía, OmairaMartín Mateos, Pedro2023-10-162023-10-162023-12-01Optics and Lasers in Engineering, (2023), v. 171, 107801.0143-8166https://hdl.handle.net/10016/38612In this paper, we present the design of a laser heterodyne radiometry instrument that combines, for the first time, frequency comb calibration and a remarkably high level of portability. A design that can, therefore, be more than capable of addressing the current need for accurate ground-based greenhouse gases monitoring in urban areas and other emission hot spots. Indeed, the compact, battery-powered system allows the acquisition of atmospheric spectral characterizations, at any location, without restrictions. As its most prominent feature, the system is equipped with an electro-optic frequency comb reference that provides a set of calibration ticks from which an accurate characterization of the absorption line shape can be obtained. Besides this, the spectrometer has been designed to promptly switch between traditional operation and wavelength modulation, so the performance of future inversion models may benefit greatly by this complementary data. The system has been tested in different locations in the Madrid region (Spain), where measurements have been carried out under a wide variety of conditions. Here, a set of highly representative results is presented clearly illustrating the capabilities of the developed system.7eng© 2023 The Author(s). Published by Elsevier Ltd.This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0)Atribución-NoComercial-SinDerivadas 3.0 EspañaLaser heterodyne radiometryOptical frequency combOptical atmospheric soundingWavelength-modulation laser heterodyne radiometryOptical spectroscopyGreenhouse gasesresearch articleÓpticaTelecomunicacioneshttps://doi.org/10.1016/j.optlaseng.2023.107801open access11078017OPTICS AND LASERS IN ENGINEERING171AR/0000033401