Abstract
Knowledge of present carbon sources and sinks including their spatial distribution and their variation in time is one of the essential information for predicting future CO2 atmospheric concentration levels. The differential absorption lidar (DIAL) is expected to measure atmospheric CO2 profiles in the atmospheric boundary layer and lower troposphere from a ground platform.We have succeeded to develop a compact 1.6 μm DIAL system for measuring CO2 concentration profiles in the lower atmosphere. This 1.6 μm DIAL system consists of the optical parametric generator (OPG) transmitter that excited by the LD pumped Nd:YAG laser with high repetition rate and the receiving optics that included the near-infrared photomultiplier tube operating at the analog mode and a 25 cm telescope. CO2 concentration profiles were obtained up to 2.5 km altitude.
Highlights
For the detailed analysis of forest carbon dynamics and CO2 fluxes of urban area, the CO2 concentration measurement techniques with high spatial and temporal resolution are required in the lower atmosphere [1]
We have developed a direct detection 1.6 μm differential absorption lidar (DIAL) technique to perform range-resolved measurements of vertical CO2 concentration profiles in the atmosphere
COMPACT CO2-DIAL SYSTEM In order to observe the CO2 concentration distribution in the lower altitude, the output power of transmitter and the dynamic range of the receiver of the CO2 DIAL have improved. This 1.6 μm DIAL system consists of the optical parametric generator (OPG) transmitter that excited by the LD pumped Nd:YAG MOPA (Master Oscillator Power Amplifier) system [4] and a 25 cm coaxial telescope
Summary
For the detailed analysis of forest carbon dynamics and CO2 fluxes of urban area, the CO2 concentration measurement techniques with high spatial and temporal resolution are required in the lower atmosphere [1]. In order to observe CO2 distribution in the tropopause, we have developed a compact light source and have improved the receiving system This new CO2-DIAL system can observe the vertical CO2 concentration profile from 0.4 km to 2.5 km altitude. 2. COMPACT CO2-DIAL SYSTEM In order to observe the CO2 concentration distribution in the lower altitude, the output power of transmitter and the dynamic range of the receiver of the CO2 DIAL have improved. COMPACT CO2-DIAL SYSTEM In order to observe the CO2 concentration distribution in the lower altitude, the output power of transmitter and the dynamic range of the receiver of the CO2 DIAL have improved This 1.6 μm DIAL system consists of the OPG transmitter that excited by the LD pumped Nd:YAG MOPA (Master Oscillator Power Amplifier) system [4] and a 25 cm coaxial telescope. As the transmitter beam of this DIAL system is able to scan from -4 degree to 52 degree with elevation angle, the vertical distribution of lower CO2 concentration as well as the horizontal distribution from short range can be measured with high precision
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