Abstract
An advanced diode-laser-based water vapor differential absorption lidar (WV-DIAL) has been developed. The next generation design was built on the success of previous diode-laser-based prototypes and enables accurate measurement of water vapor closer to the ground surface, in rapidly changing atmospheric conditions, and in daytime cloudy conditions up to cloud base. The lidar provides up to 1 min resolution, 150 m range resolved measurements of water vapor in a broad range of atmospheric conditions. A description of the instrument and results from its initial field test in 2014 are discussed.
Highlights
Water vapor is a potent greenhouse gas which is heterogeneously distributed in the lower part of atmosphere
We have built on these seminal instruments and developed them further – towards a sensor that would be suitable for a national scale network – by improving eye-safety and reliability, and enabling accurate measurement of water vapor closer to the ground surface, in rapidly changing atmospheric conditions, and in daytime cloudy conditions up to cloud base [13]
The instrument was autonomously operated in Erie, CO, USA during the Front Range Air Pollution and Photochemistry Experiment (FRAPPE) between 1-July 2014 and 19-August 2014
Summary
Water vapor is a potent greenhouse gas which is heterogeneously distributed in the lower part of atmosphere. A new generation of lower cost water vapor lidar – capable of safely, accurately, continuously, and autonomously measuring water vapor in the lower troposphere with high vertical resolution – is needed to lower the barrier to investment and enable a network. We have built on these seminal instruments and developed them further – towards a sensor that would be suitable for a national scale network – by improving eye-safety and reliability (e.g., reducing sensitivity to environmental temperature), and enabling accurate measurement of water vapor closer to the ground surface, in rapidly changing atmospheric conditions, and in daytime cloudy conditions up to cloud base [13]
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