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7 October 2011 Direct detection 1.6μm DIAL for measurements of CO2 concentration profiles in the troposphere
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Inverse techniques using atmospheric transport models are developed to estimate the CO2 sources and sinks based on the observed data. In comparison with the ground-based monitoring network, CO2 measurements for vertical profiles in the troposphere have been due to the limited observations by using campaign-style aircrafts and the commercial airlines with limited spatial and temporal coverage. The differential absorption lidar (DIAL) with the range resolution is expected to bring several advantages over passive measurements, for example, daytime coverage and neglecting influences of aerosol and cirrus layers. We have succeeded to develop the 1.6 μm DIAL technique using direct detection method for measurement of CO2 concentration profiles in the atmosphere. This paper describes the advanced CO2 1.6 μm DIAL technique consisting of the optical parametric generator (OPG) transmitter (10mJ/pulse) that excited by the LD pumped Nd:YAG laser with high repetition rate (500Hz) and the receiving optics that included the large telescope with 60cm diameter and the photomultiplier tube with high quantum efficiency (~8%) operating at the photon counting mode and the narrowband interference filter (0.5nm bandwidth) for daytime observations. The CO2 concentration profiles from ground to an altitude of 12km are conducted to measure with better than 1% standard deviation using 500m bins by this CO2 DIAL.
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Chikao Nagasawa, Makoto Abo, Yasukuni Shibata, Tomohiro Nagai, and Makoto Tsukamoto "Direct detection 1.6μm DIAL for measurements of CO2 concentration profiles in the troposphere", Proc. SPIE 8182, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VII, 81820G (7 October 2011);

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