Wavelength dependence of backscatter by use of aerosol microphysics and lidar data sets: application to 21-µm wavelength for space-based and airborne lidars

Srivastava, Vandana; Rothermel, Jeffry; Clarke, A. D.; Spinhirne, James D.; Menzies, Robert T.; Cutten, Dean R.; Jarzembski, Maurice A.; Bowdle, David A.; McCaul, Eugene W.

doi:10.1364/ao.40.004759

Cited by 18 publications

(15 citation statements)

References 20 publications

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“…The only reliable method of assessing the variability of the aerosol versus time and height in a given location is to collect datasets over an extended period. The frequency of precipitation, the back trajectory of the air mass, and the season are all factors that are known to influence the aerosol concentration (Spinhirne et al 1997;Srivastava et al 2001;Vaughan et al 2002). The observed SNR versus height for the complete vertically staring dataset was analyzed and Fig.…”

Section: B Snr Statisticsmentioning

confidence: 99%

An Analysis of the Performance of the UFAM Pulsed Doppler Lidar for Observing the Boundary Layer

Pearson

Davies

Collier

2009

Journal of Atmospheric and Oceanic Technology

294

249

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The performance of the 1.5-mm pulsed Doppler lidar, operated by the U.K. Universities Facility for Atmospheric Measurement (UFAM) over a 51-day continuous and unattended field deployment in southern England, is described and analyzed with a view to demonstrating the capabilities of the system for remote measurements of aerosols and velocities in the boundary layer. A statistical assessment of the vertical pointing mode in terms of the availability and errors in the data versus range is presented. Examples of lidar data are compared to theoretical predictions, radiosondes, the UFAM radar wind profiler, and an ultrasonic anemometer.

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Section: B Snr Statisticsmentioning

confidence: 99%

An Analysis of the Performance of the UFAM Pulsed Doppler Lidar for Observing the Boundary Layer

Pearson

Davies

Collier

2009

Journal of Atmospheric and Oceanic Technology

294

249

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show abstract

“…The in situ instruments provided both microphysical measurements and thermal IR scattering characteristics at flight altitude. Extensive comparisons of the focused CW laser backscatter data and modeled aerosol backscatter using the particle counters have been reported [ Cutten et al , 1996; Srivastava et al , 1997; Cutten et al , 1998; Srivastava et al , 2001]. Several studies of aerosol in the free troposphere based on measurement data from these in situ instruments have been reported [ Clarke , 1993; Srivastava et al , 1995; Rothermel et al , 1996a; Cutten et al , 1996; Srivastava et al , 1997].…”

Section: Experiments Descriptionmentioning

confidence: 99%

Aerosol layers over the Pacific Ocean: Vertical distributions and optical properties as observed by multiwavelength airborne lidars

et al. 2002

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[1] Scattering properties of tropospheric aerosol layers were observed with airborne lidars during the Global Backscatter Experiment (GLOBE) airborne campaigns covering a wide range of latitude and longitude over the Pacific Ocean. Lidar data at 0.532, 1.064, 1.54, and 9.25 mm wavelengths are used to study the vertical profiles and optical properties of the marine boundary layer (MBL) as well as elevated dust layers due to transport of material from Asia. The lidars were calibrated to provide absolute aerosol backscatter coefficients at their respective wavelengths. The lidar data are compared with predictions based on commonly used dust and sea salt aerosol refractive index and size distribution parameters. Published observations of aerosol characteristics from onboard in situ sensors are used to verify locations where mineral dust aerosol dominated the aerosol optical properties in the free troposphere. Relative humidity has a major impact on the observed MBL aerosol scattering characteristics. The multiwavelength observations of the dust layers are consistent with the assumption that for the particle size range that dominates the scattering properties the particle size distribution varies little over 10 3 km transport distances and is not strongly dependent on altitude. A nonsphericity effect on the dust scattering, in particular the suppression of backscattering at the shorter lidar wavelengths, is discussed in the context of data comparisons with model predictions. The observations of the sea salt aerosol scattering in the remote MBL indicate that at altitudes above 150 m in optically clear conditions the influence of the supermicron coarse mode is minor compared with that of the submicron accumulation mode.

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“…In our simulation the combined effects of Mie and molecular backscattering are taken into account. Since the aerosol type and density in the atmosphere is hard to predict and model, we have assumed a moderate loading of aerosols [12] with uniform scattering throughout the measurement range. The Rayleigh backscatter parameters have been adopted from the U.S. Standard Atmospheric Model.…”

Section: Simulation Resultsmentioning

confidence: 99%

A Micropulse eye-safe all-fiber molecular backscatter coherent temperature lidar

Abari

Chu

Mann

et al. 2016

EPJ Web of Conferences

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Abstract-In this paper, we analyze the performance of an all-fiber, micropulse, 1.5 µm coherent lidar for remote sensing of atmospheric temperature. The proposed system benefits from the recent advances in optics/electronics technology, especially an all-fiber image-reject homodyne receiver, where a high resolution spectrum in the baseband can be acquired. Due to the presence of a structured spectra resulting from the spontaneous Rayleigh-Brillouine scattering, associated with the relevant operating regimes, an accurate estimation of the temperature can be carried out. One of the main advantages of this system is the removal of the contaminating Mie backscatter signal by electronic filters at the baseband (before signal conditioning and amplification). The paper presents the basic concepts as well as a Monte-Carlo system simulation as the proof of concept.

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Wavelength dependence of backscatter by use of aerosol microphysics and lidar data sets: application to 21-µm wavelength for space-based and airborne lidars

Cited by 18 publications

References 20 publications

An Analysis of the Performance of the UFAM Pulsed Doppler Lidar for Observing the Boundary Layer

An Analysis of the Performance of the UFAM Pulsed Doppler Lidar for Observing the Boundary Layer

Aerosol layers over the Pacific Ocean: Vertical distributions and optical properties as observed by multiwavelength airborne lidars

A Micropulse eye-safe all-fiber molecular backscatter coherent temperature lidar

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