Intramonthly Indices of the Pacific/North American Teleconnection Pattern and Temperature Regimes over the United States |
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| Authors: | C E Konrad |
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| Institution: | (1) Department of Geography, University of North Carolina at Chapel Hill, U.S.A., US |
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| Abstract: | Summary Previous work has examined relationships between the planetary scale Pacific North American (PNA) teleconnection pattern
and regional scale mean temperature over portions of the United States, but analyses have been restricted to monthly values
of these two variables. It is not clear if this is the most appropriate scale for relating PNA patterns to temperature. In
this study, PNA indices are related to various aspects of temperature over a range of time scales spanning one month. To carry
this out, standardized PNA indices are calculated for 6 time intervals ranging from 5 to 30 days over a period of 27 winter
seasons. Standardized regional scale temperature anomalies are assessed over various regions of the United States and used
to compute mean, maximum, and minimum temperature anomalies over the same 6 time intervals. Correlation matrices are then
constructed to provide relationship characteristics between the PNA indices and temperature measures within the intramonthly
time scale.
Only the southeastern and northwestern regions of the United States display significant relationships between the PNA indices
and temperature. Over the Southeast, temperature anomalies on short time scales relate most strongly to PNA indices computed
over time intervals of 25 to 30 days; this is especially the case for the minimum temperature anomaly. The strongest relationships,
however, are observed between the PNA index and temperature anomalies computed on a 20–25 day time interval. Over the Northwest,
the relationships are not as strong and somewhat more varied. Most notably, moderate connections are found between the 30
day PNA index and minimum temperature anomalies computed over a 25 day period.
Received August 18, 1997Revised November 28, 1997 |
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