Journal ArticleDOI
Classification, seasonality and persistence of low-frequency atmospheric circulation patterns
TLDR
In this article, Orthogonally rotated principle component analysis (RPCA) was used to identify and describe the seasonality and persistence of the major modes of interannual variability.Abstract:
Orthogonally rotated principle component analysis (RPCA) of Northern Hemisphere 1-month mean 700 mb heights is used to identify and describe the seasonality and persistence of the major modes of interannual variability. The analysis is detailed and comprehensive, in that 1) a high resolution, approximately equal-area 358-point grid is used for the virtually maximum possible 35-year period of record, 2) a positive bias in the NMC data base in the early 1950s in the subtropics is largely eliminated for the first time, and 3) homogeneous, separate analyses of each month of the year are carried out, detailing the mouth-to-month changes in the dominant circulation patterns. Winter results are similar to those of other recent RPCA and teleconnection studies except that some less obvious patterns are identified and further detail of the better-known patterns is provided. Two north-south dipole patterns are found over the Pacific Ocean (West Pacific Oscillation and East Pacific pattern) and over the Atla...read more
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BookDOI
Hydrological, Socioeconomic and Ecological Impacts of the North Atlantic Oscillation in the Mediterranean Region
TL;DR: The influence of external forcing factors on the observed North Atlantic Oscillation (NAO) index is still an open question as discussed by the authors, and it is possible that anthropogenic forcing could be altering the temporal or spatial character of the interannual NAO variability, though only relatively small changes in pattern are evident when considering the multi-model ensemble as a whole and there is only weak evidence for an increase in the interANNual variance.
Journal ArticleDOI
Role of the Pacific-North American (PNA) pattern in the 2007 Arctic sea ice decline
TL;DR: This paper showed that the anomalous circulation was linked to a leading climate mode of the Northern Hemisphere, the Pacific-North American (PNA) pattern, and its primary signal in the atmospheric circulation is a strong anomalous anticyclone that was collocated with the location of the greatest Arctic sea ice decline.
Journal ArticleDOI
Serial clustering of intense European storms
TL;DR: In this article, the authors investigated how the clustering of wintertime extra-tropical cyclones depends on the vorticity intensity of the cyclones, and the sampling time period over which cyclone transits are counted.
Journal ArticleDOI
Improved Skill of Northern Hemisphere Winter Surface Temperature Predictions Based on Land–Atmosphere Fall Anomalies
TL;DR: A statistical forecast model, referred to as the snowcast (sCast) model, has been developed using observed October mean snow cover and sea level pressure anomalies to predict upcoming winter land surface temperatures for the extratropical Northern Hemisphere.
Journal ArticleDOI
Circulation Regimes: Chaotic Variability versus SST-Forced Predictability
TL;DR: In this article, the authors studied the circulation regimes in the Pacific-North American region using the NCEP-NCAR reanalyses for the 18-winter period (1981/82-1998/99, N CEP18) and for the 54-winter periods (1948/49-2001/02, NCEPCN54).
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