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

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Long-term variations in the surface air 7Be concentration and climatic changes.

Liu Jiwen¹, Valeriia N Starovoitova, Douglas P Wells

¹Idaho State University, Idaho Accelerator Center, 1500 Alvin Ricken Dr., Pocatello, ID 83201, USA.

Journal of Environmental Radioactivity

|October 30, 2012

Summary

Global beryllium-7 (7Be) surface concentrations show a decreasing trend over 25 years, possibly linked to atmospheric transport changes. A weak negative correlation with precipitation was also noted.

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Area of Science:

Environmental Science
Atmospheric Chemistry
Geochemistry

Background:

Beryllium-7 (7Be) is a cosmogenic radionuclide with a known atmospheric source.
Surface Air Sampling Program (SASP) data provides long-term measurements of atmospheric radionuclides.
Understanding 7Be trends can offer insights into atmospheric transport processes.

Purpose of the Study:

To analyze the long-term trend of 7Be surface concentration.
To investigate correlations between 7Be trends and climatic changes, specifically precipitation and temperature.
To assess the influence of atmospheric transport on 7Be distribution.

Main Methods:

Utilized EML Surface Air Sampling Program (SASP) data from 23 global sites.
Analyzed 7Be concentration data spanning over 25 years.
Employed two independent techniques to extract long-term trend parameters.

Main Results:

A pronounced decreasing trend in 7Be concentrations was observed at most stations.
A weak negative correlation between 7Be concentration and precipitation amount was identified.
Potential statistically significant changes in the atmospheric transport of 7Be were indicated.

Conclusions:

The observed decreasing trend in 7Be suggests alterations in atmospheric transport mechanisms.
Climate variables, particularly precipitation patterns, may weakly influence 7Be surface concentrations.
Further data from more globally representative sites are required to confirm the statistical robustness of these findings.