scholarly journals Role of ozone in the solar cycle modulation of the North Atlantic Oscillation

2008 ◽  
Vol 113 (D14) ◽  
Author(s):  
Yuhji Kuroda ◽  
Koji Yamazaki ◽  
Kiyotaka Shibata
Keyword(s):  
Solar Cycle ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

The Role of Extratropical Air–Sea Interaction in the Autumn Subseasonal Variability of the North Atlantic Oscillation

2019 ◽  
Vol 32 (22) ◽  
pp. 7697-7712 ◽  
Author(s):  
Yu Nie ◽  
Hong-Li Ren ◽  
Yang Zhang
Keyword(s):  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Gulf Stream ◽  
Low Frequency ◽  
Mean Flow ◽  
The North ◽  
Subseasonal Variability ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract Considerable progress has been made in understanding the internal eddy–mean flow feedback in the subseasonal variability of the North Atlantic Oscillation (NAO) during winter. Using daily atmospheric and oceanic reanalysis data, this study highlights the role of extratropical air–sea interaction in the NAO variability during autumn when the daily sea surface temperature (SST) variability is more active and eddy–mean flow interactions are still relevant. Our analysis shows that a horseshoe-like SST tripolar pattern in the North Atlantic Ocean, marked by a cold anomaly in the Gulf Stream and two warm anomalies to the south of the Gulf Stream and off the western coast of northern Europe, can induce a quasi-barotropic NAO-like atmospheric response through eddy-mediated processes. An initial southwest–northeast tripolar geopotential anomaly in the North Atlantic forces this horseshoe-like SST anomaly tripole. Then the SST anomalies, through surface heat flux exchange, alter the spatial patterns of the lower-tropospheric temperature and thus baroclinicity anomalies, which are manifested as the midlatitude baroclinicity shifted poleward and reduced baroclinicity poleward of 70°N. In response to such changes of the lower-level baroclinicity, anomalous synoptic eddy generation, eddy kinetic energy, and eddy momentum forcing in the midlatitudes all shift poleward. Meanwhile, the 10–30-day low-frequency anticyclonic wave activities in the high latitudes decrease significantly. We illustrate that both the latitudinal displacement of midlatitude synoptic eddy activities and intensity variation of high-latitude low-frequency wave activities contribute to inducing the NAO-like anomalies.

Influence of the Solar Cycle on the North Atlantic Oscillation

2021 ◽  
Author(s):  
Yuhji Kuroda ◽  
Kunihiko Kodera ◽  
Kohei Yoshida ◽  
Seiji Yukimoto ◽  
Lesley Gray
Keyword(s):  
Solar Cycle ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

scholarly journals The role of the North Atlantic Oscillation in European climate projections

2016 ◽  
Vol 49 (9-10) ◽  
pp. 3141-3157 ◽  
Author(s):  
Clara Deser ◽  
James W. Hurrell ◽  
Adam S. Phillips
Keyword(s):  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Climate Projections ◽  
The North ◽  
European Climate ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

scholarly journals Robust winter warming over Eurasia under stratospheric sulfate geoengineering – the role of stratospheric dynamics

2020 ◽  
Author(s):  
Antara Banerjee ◽  
Amy H. Butler ◽  
Lorenzo M. Polvani ◽  
Alan Robock ◽  
Isla R. Simpson ◽  
...  
Keyword(s):  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Volcanic Eruptions ◽  
Forced Response ◽  
Positive Phase ◽  
Dynamical Response ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Abstract. It has been suggested that increased stratospheric sulfate aerosol loadings following large, low latitude volcanic eruptions can lead to wintertime warming over Eurasia through dynamical stratosphere-troposphere coupling. We here investigate the proposed connection in the context of hypothetical future stratospheric sulfate geoengineering in the Geoengineering Large Ensemble simulations. In those geoengineering simulations, we find that stratospheric circulation anomalies that resemble the positive phase of the Northern Annular Mode in winter is a distinguishing climate response which is absent when increasing greenhouse gases alone are prescribed. This stratospheric dynamical response projects onto the positive phase of the North Atlantic Oscillation, leading to associated side-effects of this climate intervention strategy, such as continental Eurasian warming and precipitation changes. Seasonality is a key signature of the dynamically-driven surface response. We find an opposite response of the North Atlantic Oscillation in summer, when no dynamical role of the stratosphere is expected. The robustness of the wintertime forced response stands in contrast to previously proposed volcanic responses.

scholarly journals Aeolian sediment reconstructions from the Scottish Outer Hebrides: Late Holocene storminess and the role of the North Atlantic Oscillation

2016 ◽  
Vol 132 ◽  
pp. 15-25 ◽  
Author(s):  
Lisa C. Orme ◽  
Liam Reinhardt ◽  
Richard T. Jones ◽  
Dan J. Charman ◽  
Andrew Barkwith ◽  
...  
Keyword(s):  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Late Holocene ◽  
The North ◽  
Outer Hebrides ◽  
The North Atlantic ◽  
The North Atlantic Oscillation ◽  
Aeolian Sediment
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