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Related Experiment Video

Updated: Jun 12, 2026

Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer

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Problems in comparing particulate spectrometer and visibility meter data.

R B Loveland, J D Lindberg

|June 12, 2010

Summary

This summary is machine-generated.

Discrepancies in aerosol extinction measurements were found between particulate spectrometers and visibility meters in stratus clouds. Instrument design limitations, specifically the visibility meter's acceptance angle and the spectrometer's electro-optical design, cause errors at high and low aerosol extinction, respectively.

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Area of Science:

Atmospheric Science
Cloud Physics
Aerosol Science

Background:

Accurate measurement of aerosol properties is crucial for understanding cloud formation and climate.
Vertical profiles of aerosol properties in low stratus clouds are important for atmospheric modeling.
Simultaneous data acquisition using different instruments is necessary for cross-validation.

Purpose of the Study:

To investigate discrepancies between particulate spectrometers and visibility meters in measuring aerosol extinction in stratus clouds.
To identify the causes of measurement errors under varying aerosol extinction conditions.
To improve the accuracy of aerosol property measurements in cloudy environments.

Main Methods:

Simultaneous data collection using particulate spectrometers and a visibility meter.
Application of Mie theory for calculating extinction from particulate data.
Analysis of discrepancies between calculated and inferred extinction values.
Investigation of potential instrument-specific error sources.

Main Results:

Discrepancies observed between particulate spectrometer and visibility meter data, particularly at high and low aerosol extinction.
The limited acceptance angle of the visibility meter (integrating nephelometer) contributes to errors at high extinction.
Electro-optical design peculiarities of the particulate spectrometer lead to errors in aerosol density estimates at low extinction.

Conclusions:

Both particulate spectrometers and visibility meters have limitations affecting aerosol extinction measurements in stratus clouds.
Instrument design factors significantly influence measurement accuracy under specific aerosol loading conditions.
Further research and instrument refinement are needed for reliable aerosol property profiling in clouds.