Interannual variability of United States cloudiness

Details Interannual variability of United States cloudiness Interannual variability of United States cloudiness

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995angeo..13..660k&link_type=abstract

Annales Geophysicae, vol. 13, Issue 6, pp.660-665

Physics

4

Scientific paper

United States cloudiness data for 1950-1992 show quasi-biennial (QBO) and quasi-triennial (QTO) oscillations which match partly with the QBO and QTO of the Southern Oscillation (SO) index (the Tahiti minus Darwin pressure), but not with the QBO of the 50-mb equatorial zonal wind. Cloudiness also shows significant periodicities near 4.2 and 7.5 years, and probably a sunspot cycle effect (periodicities 11-14 years), with minimum cloudiness at or soon after sunspot minima, though this could also be due to periodicities of 10 and 17 years observed in the SO index. During 1955-1970, cloudiness increased by about 1%. Thereafter, it remained almost steady for the eastern and central parts of the USA, but continued to rise until about 1980 for the western USA.

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