Measurements of the background methane concentration with a remote lidar on kilometer routes in the Moscow region.

Abstract

Local path measurements of the background methane concentration in the northeast of the Moscow Region were carried out using a remote active lidar based on a powerful Raman amplifier of optical radiation in the wavelength range of ~ 1650 nm. The radiation power in the pulse was about 3 W. The trasses were selected taking into account possible anomalous deviations of the background of atmospheric methane and included forests, gasified buildings with natural gas, a peat lake, a road with heavy traffic, a livestock farm and a solid waste landfill. The length of the distances ranged from ~ 0.6 km to ~ 3.15 km. The highest background concentration of methane was observed over a livestock farm, over a highway and a solid waste landfill, which confirms the fact of an increase in gas emissions over these facilities. Also higher methane levels were observed above of the gasified homes and the heavy traffic road, indicating a possible increase in the number of vehicles using methane as fuel and a possible leak of natural gas from pipelines supplying buildings with natural gas.

Numerical simulation of greenhouse gas measurements in the atmosphere by using a two-channel near-IR lidar system

“…For this reason, the problem of monitoring greenhouse gas concentrations using methods and means of remote sensing is relevant today. Among the methods of gas analysis, one can distinguish the method of differential absorption lidar technique (DIAL) [1][2][3][4] and differential optical absorption spectroscopy (DOAS) [5]. The aim of this work is to develop an IR lidar system for the simultaneous reconstruction of spatially resolved profiles and concentrations of the studied greenhouse gases (CO 2 , H 2 O) averaged along the horizontal sounding path using the DIAL and DOAS registration channels.…”

Concept of a mobile three-channel IR lidar system for sounding greenhouse gases in the atmosphere

“…Laser detection and measurement of the concentrations of atmospheric gases (greenhouse gases in particular) in the IR spectral region is based on the principle of laser absorption spectroscopy (LAS). Among LAS gas analysis methods, the differential absorption technique (differential absorption lidar (DIAL) and integral-path differential absorption (IPDA)) [1][2][3][4][5][6][7] and diode laser absorption spectroscopy (DLAS) [8][9][10][11][12] should be noted.…”