Scientists at the Hebrew University of Jerusalem have demonstrated that sea spray over the oceans contributes to cleansing air that has been polluted overland. The air pollution is washed down by rain, which occurs because the rain-suppressing effect of such pollution is significantly neutralized. An article on this research appears in the online magazine Science Express, published today.
In previous studies, Prof. Daniel Rosenfeld of the Ring Department of Atmospheric Sciences, and colleagues from the Hebrew University and elsewhere have shown that particles generated by such elements as urban pollution, desert dust and burning of vegetation hinder precipitation by creating nuclei in clouds around which droplets are formed. These droplets are too small to bond together to form actual raindrops, thereby reducing rainfall.
The new observations by Prof. Rosenfeld, together with Hebrew University Ph.D. student Ronen Lahav, Prof. Alexander Khain and Dr. Mark Pinsky, show that precipitation from similar polluted clouds over the ocean is much less affected, because large sea salt nuclei seed the clouds and override the precipitation-suppression effect of the pollution nuclei. Raindrops initiated by the sea salt grow by collecting small cloud droplets that form on the pollution particles, thereby cleansing the air and increasing rainfall prospects.
Heidi Gleit | Hebrew University
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From June 25th to 27th 2019, the Fraunhofer Institute for Digital Media Technology IDMT in Ilmenau (Germany) will be presenting a new solution for acoustic quality inspection allowing contact-free, non-destructive testing of manufactured parts and components. The method which has reached Technology Readiness Level 6 already, is currently being successfully tested in practical use together with a number of industrial partners.
Reducing machine downtime, manufacturing defects, and excessive scrap
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Researchers at TU Graz calculate the most accurate gravity field determination of the Earth using 1.16 billion satellite measurements. This yields valuable knowledge for climate research.
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