Monitoring of Atmospheric Aerosol Parameters with the Integrating Nephelometer

Charlson, Robert J.; Ahlquist, N. C.; Selvidge, H.; MacCready, Paul B.

doi:10.1080/00022470.1969.10469360

Cited by 89 publications

(29 citation statements)

References 8 publications

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“…Many of the methods used in the past are infer-Aerosol Science and Technology 27:l July 1997 Measurement of Aerosol Liquid Water 5 1 ential rather than direct (Charlson et al, 1969;Winkler and Junge, 1972;Ho et al, 1974;Pinnick et al, 1979;Rood et al, 1987;Rader and McMurry, 1986). The direct gravimetric method developed by Hanel, 1976) is delicate and not easily transportable to field sites.…”

Section: Introductionmentioning

confidence: 99%

An Instrument for Measuring the Liquid Water Content of Aerosols

Speer¹,

Barnes

Brown

1997

Aerosol Science and Technology

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ABSTRACT. An instrument for measuring the liquid water content of aerosols is described. Aerosol samples are collected on PTFE membrane filters and then are placed in a closed chamber in which the relative humidity can be controlled over a range from 5 to 95%. A /3-gauge measures the changing aerosol mass from a low humidity through a range of increasing humidities and then through a range of decreasing humidities. The instrument corrects for changes in air density in the Egauge. A method for correcting electronic drift is described. A comparison of liquid water mass measurements of a test aerosol with gravimetric mass measurements gave a regression slope of 0.98 and a standard deviation of 0 . 7~~l r n~. Examples of analyses on a generated aerosol and a fine fraction atmospheric sample are given.

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Section: Introductionmentioning

confidence: 99%

An Instrument for Measuring the Liquid Water Content of Aerosols

Speer¹,

Barnes

Brown

1997

Aerosol Science and Technology

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“…We have chosen, for comparison purposes, the following relationship found by This may be a factor of 2 too high in some cases. 9 ' 10 Also, the Tri-City Study 8 concluded that the standard error in the relationship of M to 6 sca t w^s much too high to be useful for prediction purposes, though the highest correlation among these variables (0.83) was found between 6 sca t and refined mass concentration. However dubious, this equation does allow us to combine the results of visibility categories into a mass concentration parameter.…”

Section: Resultsmentioning

confidence: 99%

“…The Tri-City Study 8 Figure 4 are plotted using 2.86 as the constant and an experimentally determined relation of 6 sca t (and, therefore, visual range) to mean mass concentration [M]. 9 The relationship between light scatter and M is rather more dubious than between light scatter and visibility. We have chosen, for comparison purposes, the following relationship found by This may be a factor of 2 too high in some cases.…”

Section: Resultsmentioning

confidence: 99%

Cyclic Trends in Los Angeles Fine Participates

Porch

Ellsaesser

1977

Journal of the Air Pollution Control Association

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“…In situ balloon observations continue to be used and have provided highly valuable data sets, including most notably the long time series of optical particle counter measurements from Laramie, WY (Deshler et al, 2003(Deshler et al, , 2006Kovilakam and Deshler, 2015). Aircraft-borne nephelometers (Beuttell and Brewer, 1949;Charlson et al, 1969) acquire detailed in situ measurements, providing, for example, plume composition (Murphy et al, 2014), but are spatially limited to the aircraft track. Ground-based lidars have been used to do detailed studies of the extent of volcanic aerosol plumes (Chazette et al, 1995;Sawamura et al, 2012) and provide valuable insight into long-term local variability and trends in the aerosol layer.…”

Section: Introductionmentioning

confidence: 99%

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

et al. 2016

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Abstract. The Aerosol Limb Imager (ALI) is an optical remote sensing instrument designed to image scattered sunlight from the atmospheric limb. These measurements are used to retrieve spatially resolved information of the stratospheric aerosol distribution, including spectral extinction coefficient and particle size. Here we present the design, development and test results of an ALI prototype instrument. The longterm goal of this work is the eventual realization of ALI on a satellite platform in low earth orbit, where it can provide high spatial resolution observations, both in the vertical and cross-track. The instrument design uses a large-aperture acousto-optic tunable filter (AOTF) to image the sunlit stratospheric limb in a selectable narrow wavelength band ranging from the visible to the near infrared. The ALI prototype was tested on a stratospheric balloon flight from the Canadian Space Agency (CSA) launch facility in Timmins, Canada, in September 2014. Preliminary analysis of the hyperspectral images indicates that the radiance measurements are of high quality, and we have used these to retrieve vertical profiles of stratospheric aerosol extinction coefficient from 650 to 1000 nm, along with one moment of the particle size distribution. Those preliminary results are promising and development of a satellite prototype of ALI within the Canadian Space Agency is ongoing.

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Monitoring of Atmospheric Aerosol Parameters with the Integrating Nephelometer

Cited by 89 publications

References 8 publications

An Instrument for Measuring the Liquid Water Content of Aerosols

An Instrument for Measuring the Liquid Water Content of Aerosols

Cyclic Trends in Los Angeles Fine Participates

The Aerosol Limb Imager: acousto-optic imaging of limb-scattered sunlight for stratospheric aerosol profiling

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