rl: Raman Lidar

The Raman Lidar (RL) is an active, ground-based, laser remote-sensing instrument that provides height- and time-resolved measurements of water-vapor mixing ratio, temperature, aerosol, and cloud optical properties. The RL operates in the UV and is sensitive to both molecular and aerosol backscatter.

The RL works by transmitting short pulses of UV laser light into the atmosphere. As the light propagates, a small fraction of the light energy is scattered back to the lidar transceiver where it is collected and recorded as a time-resolved signal. From the delay between the outgoing pulse and the backscattered signal, the instrument infers the distance to the scattering volume.

As the name implies, the RL makes use of the Raman effect in which light is inelastically scattered by atmospheric N2, O2 and H2O molecules. The ARM RL uses a number of narrow-band detection channels specifically tuned to sense the Raman backscatter from these molecules. Several other detection channels are configured to measure elastically backscattered light from atmospheric aerosol. The raw signals from these detection channels are combined and processed to yield measurements of water vapor mixing ratio, temperature, aerosol backscatter coefficient, extinction, and depolarization ratio.

Measurements

Locations

  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications

2018

Wagner T, P Klein, and D Turner. 2018. "A new generation of ground-based mobile platforms for active and passive profiling of the boundary layer." Bulletin of the American Meteorological Society, , 10.1175/BAMS-D-17-0165.1. ONLINE.

Johnson A, X Wang, K Haghi, and D Parsons. 2018. "Evaluation of Forecasts of a Convectively Generated Bore Using an Intensively Observed Case Study from PECAN." Monthly Weather Review, 146(9), 10.1175/MWR-D-18-0059.1.

Lv M, Z Wang, Z Li, T Luo, R Ferrare, D Liu, D Wu, J Mao, B Wan, F Zhang, and Y Wang. 2018. "Retrieval of Cloud Condensation Nuclei Number Concentration Profiles From Lidar Extinction and Backscatter Data." Journal of Geophysical Research: Atmospheres, 123(11), 10.1029/2017JD028102.

Osman M, D Turner, T Heus, and R Newsom. 2018. "Characteristics of Water Vapor Turbulence Profiles in Convective Boundary Layers During the Dry and Wet Seasons over Darwin." Journal of Geophysical Research: Atmospheres, 123(10), 10.1029/2017JD028060.
Research Highlight

Wang W, W Gong, F Mao, and Z Pan. 2018. "Physical constraint method to determine optimal overlap factor of Raman lidar." Journal of Optics, 47(1), 10.1007/s12596-017-0427-9.

Wolfmeyer V and D Turner. 2018. Land-Atmosphere Feedback Experiment Field Campaign Report. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-18-007.

Turner D, V Wulfmeyer, A Behrendt, T Bonin, A Choukulkar, R Newsom, W Brewer, and D Cook. 2018. "Response of the Land-Atmosphere System Over North-Central Oklahoma During the 2017 Eclipse." Geophysical Research Letters, 45(3), 10.1002/2017GL076908.
Research Highlight

Wulfmeyer V, D Turner, B Baker, R Banta, A Behrendt, T Bonin, W Brewer, M Buban, A Choukulkar, E Dumas, R Hardesty, T Heus, J Ingwersen, D Lange, T Lee, S Metzendorf, S Muppa, T Meyers, R Newsom, M Osman, S Raasch, J Santanello, C Senff, F Sp├Ąth, T Wagner, and T Weckwerth. 2018. "A New Research Approach for Observing and Characterizing Land-Atmosphere Feedback." Bulletin of the American Meteorological Society, 99(8), 10.1175/BAMS-D-17-0009.1.

2017

Tridon F, A Battaglia, and D Watters. 2017. "Evaporation in action sensed by multiwavelength Doppler radars." Journal of Geophysical Research: Atmospheres, 122(17), 10.1002/2016JD025998.

Thorsen T, R Ferrare, C Hostetler, M Vaughan, and Q FU. 2017. "The impact of lidar detection sensitivity on assessing aerosol direct radiative effects." Geophysical Research Letters, 44(17), 10.1002/2017GL074521.


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