Spectral analysis, digital integration, and measurement of low backscatter in coherent laser radar

Vaughan, J. M.; Callan, R D; Bowdle, David A.; Rothermel, Jeffry

doi:10.1364/ao.28.003008

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…Following the measurements out of Ascension Island (SABLE 1988 and1989), an initial outline of the aim and scope of the program was given by Alejandro et al [1990].…”

Section: Program Outlinementioning

confidence: 99%

“…Some examples are shown in section 4. As noted by Vaughan et al [1989], it is difficult to put a precise value on the likely absolute error in the backscatter calculation in view of the many terms entering the calibration expressions, especially detector performance [see Wilson et al, 1991]. Reasonable estimates would suggest an overall limit error of -40%.…”

Section: Aircraft Parameters and Airborne Equipmentmentioning

confidence: 99%

See 1 more Smart Citation

Atlantic atmospheric aerosol studies: 1. Program overview and airborne lidar

Alejandro¹,

Koenig²,

Bedo³

et al. 1995

J. Geophys. Res.

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During the period 1988–1990, studies of atmospheric aerosol have been made over the Atlantic. These include measurement programs out of Ascension Island (8°S, 14°W), the Azores (38°N, 25°W), Iceland (63°N, 23°W), and from the United Kingdom over the Northeast Atlantic. For these studies the equipment deployed included an airborne backscatter lidar (operating at 10.6 μm), airborne particle‐sounding probes, ground‐based lidars (operating at 10.6, 0.53, and 0.35 μm), balloon radiosondes, and a Sun‐tracking photometer. In addition, standard meteorological information has been incorporated along with, when appropriate, data from the SAGE II limb‐sounding satellite. The present paper thus introduces an overview of the program together with an outline of the technology, measurement characteristics, and performance of the airborne equipment that determined the strategic planning of much of the work. The measurements themselves, made in the relatively clean period for the atmosphere before the Mount Pinatubo eruption, will be presented in a subsequent series of papers.

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“…Following the measurements out of Ascension Island (SABLE 1988 and1989), an initial outline of the aim and scope of the program was given by Alejandro et al [1990].…”

Section: Program Outlinementioning

confidence: 99%

Section: Aircraft Parameters and Airborne Equipmentmentioning

confidence: 99%

Atlantic atmospheric aerosol studies: 1. Program overview and airborne lidar

Alejandro¹,

Koenig²,

Bedo³

et al. 1995

J. Geophys. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…At higher levels (greater than 2 x 10-9 m-• sr-•) there may, on occasion, be some tendency to overestimate the backscatter coefficient, most particularly in conditions of high turbulence. However, any such overestimation cannot be greater than a factor of 2 at most [seeVaughan et al, 1989, section V] and is likely to be much less. At worst, this would introduce very little change to the distributions of Figures 7-12.…”

mentioning

confidence: 99%

Atlantic atmospheric aerosol studies: 2. Compendium of airborne backscatter measurements at 10.6μm

Vaughan¹,

Brown²,

Nash³

et al. 1995

J. Geophys. Res.

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The airborne backscatter measurements at 10.6 μm, from the South Atlantic Backscatter Lidar Experiment (SABLE) and the Global Atmospheric Backscatter Lidar Experiment (GABLE) programs over the Atlantic, are gathered together and presented. Plots of backscatter versus altitude are shown for 80 flight sequences. These data comprising about 4×105 measurements from over 180 flight hours is statistically analyzed. The material is distributed in altitude (1 km) and backscatter (half decade) intervals and presented in tabular and histogram form for six principal regions and seasons: South Atlantic summer, South Atlantic winter, far‐North Atlantic spring, mid‐Atlantic spring/summer, and Northeast Atlantic winter and summer. Several features of the results are discussed, including the incidence of low backscatter and drop‐outs and the remarkably high incidence of thin cirrus in the southern tropical winter season. The compendium should provide a climatology of atmospheric backscatter at 10.6 μm for regions of the Atlantic during the relatively clean atmospheric period 1988–1990.

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“…Extensive calibration studies (Vaughan et al, 1989) established a limiting sensitivity of aerosol backscattering, (usually expressed as ()), of 8 Â 10 À12 m À1 sr À1 . LATAS was carried on a Canberra (B-57) twin engined aircraft with operational ceiling of 16 km and maximum ight duration of 4 hours.…”

Section: Backscatter Measurementsmentioning

confidence: 99%

Comparison of atmospheric aerosol backscattering and air mass back trajectories

Vaughan¹,

Maryon

Geddes³

2002

Meteorology and Atmospheric Physics

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Atmospheric backscattering from aerosol particulates has been measured over the Atlantic at 10.6 mm wavelength with an airborne, coherent heterodyne, lidar, and corresponding air mass back trajectories have been calculated. These back trajectories (usually extended up to 10 days prior to the backscatter measurement) have shown very diverse origins for the air parcels at different altitudes. In many cases it has been possible to attribute the observed levels of scattering to these origins over oceanic, arctic, continental, industrial etc. regions. This is illustrated by 6¯ight records: out of Ascension Island in the South Atlantic; over the Azores in the mid North Atlantic; over the UK and the North Sea; and in the Arctic along 71 North. In each of these regions the pro®les of backscatter versus altitude show highly variable features; remarkably different origins for air masses at different altitudes are evident from the corresponding back trajectory analyses. It is thus possible for the ®rst time to present probable explanations for the different levels of scattering observed at different altitudes.

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Spectral analysis, digital integration, and measurement of low backscatter in coherent laser radar

Cited by 15 publications

References 5 publications

Atlantic atmospheric aerosol studies: 1. Program overview and airborne lidar

Atlantic atmospheric aerosol studies: 1. Program overview and airborne lidar

Atlantic atmospheric aerosol studies: 2. Compendium of airborne backscatter measurements at 10.6μm

Comparison of atmospheric aerosol backscattering and air mass back trajectories

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