Abstract
Modeling of a space-based high-energy 2-μm triple-pulse Integrated Path Differential Absorption (IPDA) lidar was conducted to demonstrate carbon dioxide (CO2) measurement capability and to evaluate random and systematic errors. A high pulse energy laser and an advanced MCT e-APD detector were incorporated in this model. Projected performance shows 0.5 ppm precision and 0.3 ppm bias in low-tropospheric column CO2 mixing ratio measurements from space for 10 second signal averaging over Railroad Valley (RRV) reference surface.
Highlights
Sustained high-quality column CO2 measurements from space are required to improve estimates of regional and global scale sources and sinks to attribute them to specific biogeochemical processes for improving models of carbon-climate interactions and to reduce uncertainties in projecting future change
Technology developments are in progress to provide high pulse energy 2- m Integrated Path Differential Absorption (IPDA) that enables optimum, lower troposphere weighted column CO2 measurements from space
The IPDA lidar receiver is based on an advanced HgCdTe (MCT) electron avalanche photodiode (e-APD) detection system demonstrated at NASA GSFC
Summary
Sustained high-quality column CO2 measurements from space are required to improve estimates of regional and global scale sources and sinks to attribute them to specific biogeochemical processes for improving models of carbon-climate interactions and to reduce uncertainties in projecting future change. Space-based IPDA systems can provide sustained, high precision and low-bias column CO2 in presence of thin clouds and aerosols. Technology developments are in progress to provide high pulse energy 2- m IPDA that enables optimum, lower troposphere weighted column CO2 measurements from space. This system provides simultaneous ranging; information on aerosol and cloud distributions, measurements over region of broken clouds, and reduces influences of surface complexities. Modeling the performance of a direct-detection high pulse energy 2- m IPDA from space is presented in this paper [3]
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