Abstract
A strong correlation has been observed between concentrations of radon (222Rn) and cloud condensation nuclei (CCN) during long-distance transit flights over North America and during several days of observations over Arizona. The correlation coefficient between the compared observations was 0.92 for transit flights at altitude 2000–4000 m. Correlation coefficients for five altitude profiles, each from 300 to 4500 m over Arizona, were in the range of 0.73–0.95. Over oceans and snow-covered areas there was no correlation. There was no significant correlation for two vertical profiles over Arizona because of unusually high CCN concentrations between 2000 and 3000 m.
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