A Zonal Wave Number-3 Pattern of Northern Hemisphere Wintertime Planetary Wave Variability at High Latitudes

TitleA Zonal Wave Number-3 Pattern of Northern Hemisphere Wintertime Planetary Wave Variability at High Latitudes
Publication TypeJournal Article
Year of Publication2012
JournalJournal of Climate
Pages6756-6769
Date PublishedMarch
Abstract

Low-frequency variability and the trend of the Northern Hemisphere (NH) wintertime large-scale circulation are often represented in terms of a NH annual mode (NAM), which mainly represents the zonal mean circulations. However the NH high latitudes exhibit strong wave structures.  In a recent study, BER-funded scientists at the National Center for Atmospheric Research analyzed reanalysis data during the past 50 years or so and global coupled climate model simulations. They identified a prominent pattern of variability of the stationary waves defined by the second empirical orthogonal function of detrended December-February mean 300 hPa meridional wind and they named it the Wave3 Pattern.  This pattern  is worthy of attention because its structure is similar to the linear trend pattern as well as the leading pattern of multi-decadal variability of the planetary waves during the past half century. Climate models must represent it correctly if they are to accurately estimate theregional reaction to greenhouse gas increases.

DOI10.1175/JCLI-D-11-00664.1
Journal: Journal of Climate

Low-frequency variability and the trend of the Northern Hemisphere (NH) wintertime large-scale circulation are often represented in terms of a NH annual mode (NAM), which mainly represents the zonal mean circulations. However the NH high latitudes exhibit strong wave structures.  In a recent study, BER-funded scientists at the National Center for Atmospheric Research analyzed reanalysis data during the past 50 years or so and global coupled climate model simulations. They identified a prominent pattern of variability of the stationary waves defined by the second empirical orthogonal function of detrended December-February mean 300 hPa meridional wind and they named it the Wave3 Pattern.  This pattern  is worthy of attention because its structure is similar to the linear trend pattern as well as the leading pattern of multi-decadal variability of the planetary waves during the past half century. Climate models must represent it correctly if they are to accurately estimate theregional reaction to greenhouse gas increases.

DOI: 10.1175/JCLI-D-11-00664.1
Year of Publication: 2012
Citation:
Teng, H, and G Branstator.  2012.  "A Zonal Wave Number-3 Pattern of Northern Hemisphere Wintertime Planetary Wave Variability at High Latitudes."  Journal of Climate 6756-6769, doi:10.1175/JCLI-D-11-00664.1.