Coupling between Greenland blocking and the North Atlantic Oscillation pattern

  title={Coupling between Greenland blocking and the North Atlantic Oscillation pattern},
  author={Paolo Davini and Chiara Cagnazzo and Richard B. Neale and Joseph J. Tribbia},
  journal={Geophysical Research Letters},
Through the adoption of a bidimensional blocking index based on geopotential height, it is shown that the blocking frequency over Greenland is not only a key element in describing the North Atlantic Oscillation (NAO) index, but it also operates as an essential element in modulating its pattern. When Greenland blocking is lower than average, the first Empirical Orthogonal Function (EOF) of the 500 hPa geopotential height over the Euro‐Atlantic region no longer resembles the NAO. Moreover, the… 

Asymmetries in Circulation Anomalies Related to the Phases of the North Atlantic Oscillation on Synoptic Time Scales

The North Atlantic Oscillation (NAO) index is often characterized by independent positive and negative NAO events with a characteristic spatial pattern and a typical lifetime of around 1 week. These

On the misinterpretation of the North Atlantic Oscillation in CMIP5 models

The representation of the wintertime North Atlantic Oscillation (NAO) and its relationship with atmospheric blocking and the Atlantic jet stream is investigated in a set of CMIP5 models. It is shown

Structure and impact of atmospheric blocking over the Euro‐Atlantic region in present‐day and future simulations

The spatial structure of winter atmospheric blocking and its impact on the surface temperatures are analyzed for the current climate and a strong CO2 emission scenario over the Euro‐Atlantic sector,

Linking interannual variability in extreme Greenland blocking episodes to the recent increase in summer melting across the Greenland ice sheet

Atmospheric blocking commonly occurs over the high latitudes of the Northern Hemisphere, resulting from the development of persistent areas of high pressure that lead to warmer‐than‐average surface

The Influence of the Madden–Julian Oscillation on Northern Hemisphere Winter Blocking

AbstractThe persistent and quasi-stationary nature of atmospheric blocking is associated with long-lasting extreme weather conditions that influence much of the Northern Hemisphere during boreal

On the blocking flow patterns in the Euro-Atlantic sector: A simple model study

  • D. LuoYao Yao
  • Environmental Science, Physics
    Advances in Atmospheric Sciences
  • 2014
The flow patterns of Euro-Atlantic blocking events in winter are investigated by dividing the sector into three subregions: 60°–30°W (Greenland region); 20°W–30°E [eastern Atlantic-Europe (EAE)

Relationship between zonal position of the North Atlantic Oscillation and Euro-Atlantic blocking events and its possible effect on the weather over Europe

  • Yao YaoD. Luo
  • Environmental Science
    Science China Earth Sciences
  • 2014
The North Atlantic Oscillation (NAO) exhibited a marked eastward shift in the mid-1970s. Observations show that the extreme weather events in Europe have emerged frequently in the past decades. In

Decadal Relationship between European Blocking and the North Atlantic Oscillation during 1978–2011. Part II: A Theoretical Model Study

AbstractIn Part I of this study, it is revealed that decadal variations of European blocking, in its intensity, duration, and position, during 1978–2011 are modulated by decadal changes in the

On the Predominant Nonlinear Response of the Extratropical Atmosphere to Meridional Shifts of the Gulf Stream

AbstractThe North Atlantic atmospheric circulation response to the meridional shifts of the Gulf Stream (GS) path is examined using a large ensemble of high-resolution hemispheric-scale Weather

Non-annular, hemispheric signature of the winter North Atlantic Oscillation

Sensitivity experiments with an atmospheric general circulation model (AGCM) without a proper stratosphere are performed to locally force a North Atlantic oscillation (NAO)-like response in order to



Bidimensional Diagnostics, Variability, and Trends of Northern Hemisphere Blocking

AbstractIn this paper, Northern Hemisphere winter blocking is analyzed through the introduction of a set of new bidimensional diagnostics based on geopotential height that provide information about

A New Rossby Wave–Breaking Interpretation of the North Atlantic Oscillation

This paper proposes the hypothesis that the low-frequency variability of the North Atlantic Oscillation (NAO) arises as a result of variations in the occurrence of upper-level Rossby wave–breaking

Two‐dimensional indices of atmospheric blocking and their statistical relationship with winter climate patterns in the Euro‐Atlantic region

The statistical relationship between the leading climate patterns of mid‐tropospheric flow and atmospheric blocking over the Euro–Atlantic region during winter is investigated using three new

Synoptic View of the North Atlantic Oscillation

Abstract This article investigates the synoptic characteristics of individual North Atlantic Oscillation (NAO) events by examining the daily evolution of the potential temperature field on the

Teleconnections in the Geopotential Height Field during the Northern Hemisphere Winter

Abstract Contemporaneous correlations between geopotential heights on a given pressure surface at widely separated points on earth, referred to as teleconnections in this paper, are studied in an

Atmospheric blocking: space-time links to the NAO and PNA

In the Northern hemisphere, regions characterized by an enhanced frequency of atmospheric blocking overlap significantly with those associated with the major extra-tropical patterns of large-scale

Variability of the North Atlantic eddy‐driven jet stream

Much of the atmospheric variability in the North Atlantic sector is associated with variations in the eddy‐driven component of the zonal flow. Here we present a simple method to specifically diagnose

Climate Change and the North Atlantic Oscillation

Over recent decades the boreal winter index of the North Atlantic Oscillation (NAO) has exhibited an upward trend, corresponding to lowered surface pressure over the Arctic and increased surface

Tropospheric Rossby Wave Breaking and the NAO/NAM

Objective analysis of several hundred thousand anticyclonic and cyclonic breaking Rossby waves is performed for the Northern Hemisphere (NH) winters of 1958–2006. A winter climatology of both

A possible mechanism for the eastward shift of interannual NAO action centers in last three decades

A weakly nonlinear North Atlantic Oscillation (NAO) model proposed recently by Luo et al. (2006) is used to examine the dynamical processes that dominate the eastward shift of the NAO action centers