Abstract
An advanced airborne triple-pulse 2-μm integrated path differential absorption (IPDA) lidar is under development at NASA Langley Research Center that targets both carbon dioxide (CO2) and water vapor (H2O) measurements simultaneously and independently. This lidar is an upgrade to the successfully demonstrated CO2 2-μm double-pulse IPDA. Upgrades include high-energy, highrepetition rate 2-μm triple-pulse laser transmitter, innovative wavelength control and advanced HgCdTe (MCT) electron-initiated avalanche photodiode detection system. Ground testing and airborne validation plans are presented.
Highlights
Understanding the process of CO2 exchange in the context of global climate change has become the topic of vital importance to the scientific community
Knowledge of the spatial and temporal distribution of CO2 sources and sinks, and transport in a global scale is crucial to predict and possibly manage the carbon cycle process. In response to these challenges, laser-based active remote sensing instruments are being developed at NASA Langley Research Center (LaRC) [1,2]
This paper presents the technical methodology and technology progress for this 2- m integrated path differential absorption (IPDA) lidar
Summary
Understanding the process of CO2 exchange in the context of global climate change has become the topic of vital importance to the scientific community. LaRC researchers have envisioned a 2-μm triplepulse integrated path differential absorption (IPDA) lidar that can measure atmospheric column concentrations of CO2 and H2O simultaneously and independently. This lidar operates on both ground and airborne platforms. This paper presents the technical methodology and technology progress for this 2- m IPDA lidar Utilizing meteorological data, this unique 2- m triple-pulse IPDA lidar is used to measure atmospheric dry-air column mixing ratios of CO2 (XCO2) and H2O (XH2O) with projected precision of 0.2% and 0.5%, respectively [1]. RA where RA and RG are the instrument altitude and target elevation, respectively
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