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Wind directions aloft and effects of seeding on precipitation in the whitetop experiment.

Abstract：

:The subdivision of all the experimental days of the Whitetop project into two approximately equal groups, group W with predominantly westerly winds aloft and group E with frequent easterly winds, shows a remarkable difference in the apparent effect of seeding. On W days there was no detectable effect of seeding on rainfall. On E days with seeding, the average 24 hour precipitation in an area of about 100,000 square miles was significantly less than that without seeding by 46 per cent of the latter. The decrease resulted from a "decapitation" of the usual afternoon rise in rainfall. It may be significant that the afternoon maximum of natural precipitation on E days occurs some two hours later than on W days. If the actual cause of the differences in rainfall was seeding, then the loss of water resulting from operational, rather than experimental, seeding would have averaged eight million acre-feet per summer.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Lovasich JL,Neyman J,Scott EL,Smith JA

doi

10.1073/pnas.64.3.810

subject

Has Abstract

pub_date

1969-11-01 00:00:00

pages

810-7

issue

3

eissn

0027-8424

issn

1091-6490

journal_volume

64

pub_type

杂志文章

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