Principal modes of southern hemisphere low-frequency variability obtained from NCEP-NCAR reanalysis

From: Journal of Climate | Date: September 1, 1999| Author: | Copyright information

ABSTRACT

Analysis of the 300-hPa streamfunction from the 40-year NCEP-NCAR dataset has identified the principal modes of Southern Hemisphere variability on intraseasonal (IS), interannual (IA), and intradecadal (ID) timescales. The variance of streamfunction departures from the annual cycle is zonally symmetric in the IS and IA range with the largest values at midlatitudes. The ID variance is concentrated in the Pacific sector, where it extends to lower latitudes.

For the IS band, obtained by applying a 10-50-day bandpass filter to the twice-daily streamfunction fields, three pairs of EOF ...

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