From: University of Hertfordshire
Published October 18, 2017 10:12 AM

University of Hertfordshire physicists track atmospheric particles producing Monday's red sky

During the time the particles sat over England, the sky acquired a reddish hueand the Sun appeared distinctly red, due to the preferential scattering of blue light by the particles (main image).

Professor Joseph Ulanowski of the University computed the likely path taken by the particles over the preceding six days, prior to their arrival over England, using the NOAA HYSPLIT trajectory model. These computations show that the air passed over both the Saharan desert and Portugal, picking up desert dust from the Algeria-Mauritania region of the Sahara and potentially also bushfire smoke from Portugal, which the air then carried over south-east England.

Dr Matthias Tesche, a meteorologist at the University of Hertfordshire, noted the role of tropical storm Ophelia in producing Monday’s rare views of the Sun and sky. “The presence of Ophelia in the region greatly affected the larger-scale circulation patterns and enabled it to tap into the reservoir of Saharan dust and lead it straight to the UK and Ireland,” he said.

Continue reading at University of Hertfordshire.

Image Credit:  David Campbell and the University of Hertfordshire

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