Air traffic may increase cirrus cloudiness
Article Abstract:
The link between variations in the occurrence of cirrus cloud and spatial distribution of aviation fuel consumption was studied using synoptic cloud reports from land and ship stations, between 1982 and 1991. Average changes was plotted against fuel consumption and the largest increase in cirrus occurrence between 40 degrees and 60 degrees N was found in the North Pacific Ocean which lies downwind of a high traffic area. The trend in cirrus amount over continental regions of high air traffic is estimated to correspond to additional cloud radiative forcing. Observed changes my not but due exclusively to aviation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Discovery of molecular hydrogen in a high-velocity cloud of the Galactic halo
Article Abstract:
High-velocity clouds may be the result of gas that has cooled once being ejected from the Galaxy via fountain-like flows fuelled by supernovae, or that they consist of gas which falls onto the disk of the Milky Way. Molecular hydrogen absorption has been discovered in a high velocity cloud, along with an iron abundance which is half of the solar value, concluding that gas in the cloud originated in the disk of the Milky Way.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Clouds from near and far
Article Abstract:
Richter and colleagues and Wakker and colleagues have reported differing compositions for two close high-velocity clouds (HVCs). Wakker and colleagues detected ionized sulphur in an HVC complex consistent with the Local Group hypothesis. Richter and colleagues discovered molecular hydrogen in another HVC, along with a relatively high abundance of iron.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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