Abstract
The suitability of traditional sunshine duration recorders to detect changes in atmospheric turbidity has been previously reported, especially during sunrises and sunsets. This work presents the results of an experimental measurement campaign carried out in Valencia (eastern Spain) during the summer of 2011. Some measurements reveal a possible and unexpected impact of the aerosols during the morning hours, hypothetically due to the concentration and transport of pollution associated with the inland passage of sea breeze fronts. These results confirm the suitability of sunshine duration observations using a Campbell-Stokes recorder to identify changes in atmospheric turbidity. However, future research is needed for an estimation of the atmospheric turbidity using the historical long-term sunshine duration series available for some stations since the late 19th century.
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