Airborne tunable diode laser sensor for high-precision concentration and flux measurements of carbon monoxide and methane

摘要

Abstract: An airborne tunable diode laser instrument is described that is capable of operating in two measurement modes. One mode provides high precision (0.1 percent CH$-4$/; 1 percent CO) measurements of CH$-4$/ and CO with a 5 second response time, and a second mode achieves the very fast response time ($APEQ 60 msec) that is necessary to make airborne eddy correlation flux measurements. Examples of data from atmospheric expeditions of the Global Tropospheric Experiment are presented.!