Spatial and temporal characteristics of intraseasonal oscillations of precipitation over the United States |
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| Authors: | H Ye H-R Cho |
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| Institution: | (1) Department of Geography, University of Idaho, Moscow, ID, USA, US;(2) Department of Physics, University of Toronto, Ontario, Canada, CA |
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| Abstract: | Summary This study shows that precipitation over the United States has two time scales of intraseasonal variation at about 37 days
and 24 days. The results are derived from the application of a combination of statistical methods including principal component
analysis (PCA), singular spectrum analysis (SSA), and multi-channel singular spectrum analysis (MSSA) to over 10 years of
gridded daily precipitation records. Both oscillations have largest amplitude during the cold season. The 37-day oscillation
has larger interannual variability. Intraseasonal oscillations are most significant in the Pacific Northwest. The 37-day oscillation
has opposite phases between the western and eastern United States, while the 24-day oscillation has the same phases. These
intraseasonal time scale precipitation variations may be associated with previously revealed mid-tropospheric circulation
anomalies that oscillate at similar time scales.
Received February 7, 2000 Revised October 20, 2000 |
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