Non-annular, hemispheric signature of the winter North Atlantic Oscillation
نویسندگان
چکیده
منابع مشابه
Local and hemispheric dynamics of the North Atlantic Oscillation, annular patterns and the zonal index
In this paper we discuss the atmospheric dynamics of the North Atlantic Oscillation (NAO), the zonal index, and annular patterns of variability (also known as annular modes). Our goal is to give a unified treatment of these related phenomena, to make explicit how they are connected and how they differ, and to illustrate their dynamics with the aid of an idealized primitive equation model. Our f...
متن کاملNorth Atlantic Oscillation / Annular Mode: Two Paradigms - One Phenomenon
The "North Atlantic Oscillation (NAO)" as defined in Walker and Bliss (1932) has been traditionally viewed as a teleconnection pattern with 'centers of action' in the Atlantic sector. In contrast, the "zonal index cycle", as articulated by Namias (1950), involves the interactions between a fundamentally zonally symmetric or 'annular’ mode and the eddies. The perceived dynamical significance of ...
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The North Atlantic Oscillation (NAO) is modulating the Earth’s ozone shield such that the calculated anthropogenic total ozone decrease is enhanced over Europe whereas over the North Atlantic region it is reduced (for the last 30 years). Including the NAO in a statistical model suggests a more uniform chemical winter trend compared to the strong longitudinal variation reported earlier. At Arosa...
متن کاملOn the Zonal Structure of the North Atlantic Oscillation and Annular Modes
The zonal structure and dynamics of the dipolar patterns of intraseasonal variability in the extratropical atmosphere—namely, the North Atlantic Oscillation (NAO) and the so-called annular modes of variability—are investigated in an idealized general circulation model. Particular attention is focused on the relationships linking the zonal structure of the stationary waves, synoptic variability ...
متن کاملA Mechanism and Simple Dynamical Model of the North Atlantic Oscillation and Annular Modes
A simple dynamical model is presented for the basic spatial and temporal structure of the large-scale modes of intraseasonal variability and associated variations in the zonal index. Such variability in the extratropical atmosphere is known to be represented by fairly well-defined patterns, and among the most prominent are the North Atlantic Oscillation (NAO) and a more zonally symmetric patter...
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ژورنال
عنوان ژورنال: Climate Dynamics
سال: 2016
ISSN: 0930-7575,1432-0894
DOI: 10.1007/s00382-016-3292-3