scholarly journals Solar cycle modulation of the North Atlantic Oscillation: Implication in the spatial structure of the NAO

2002 ◽  
Vol 29 (8) ◽  
pp. 59-1-59-4 ◽  
Author(s):  
Kunihiko Kodera
Keyword(s):  
Solar Cycle ◽  
Spatial Structure ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

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

Insignificant influence of the 11-year solar cycle on the North Atlantic Oscillation

2019 ◽  
Vol 12 (2) ◽  
pp. 94-99 ◽  
Author(s):  
Gabriel Chiodo ◽  
Jessica Oehrlein ◽  
Lorenzo M. Polvani ◽  
John C. Fyfe ◽  
Anne K. Smith
Keyword(s):  
Solar Cycle ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
The North ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

scholarly journals Impacts of UV Irradiance and Medium-Energy Electron Precipitation on the North Atlantic Oscillation during the 11-Year Solar Cycle

Atmosphere ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1029
Author(s):  
Sigmund Guttu ◽  
Yvan Orsolini ◽  
Frode Stordal ◽  
Odd Helge Otterå ◽  
Nour-Eddine Omrani ◽  
...  
Keyword(s):  
Solar Cycle ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
High Energy ◽  
Energy Electron ◽  
The North ◽  
Uv Irradiance ◽  
Ocean Atmosphere ◽  
The North Atlantic ◽  
The North Atlantic Oscillation

Observational studies suggest that part of the North Atlantic Oscillation (NAO) variability may be attributed to the spectral ultra-violet (UV) irradiance variations associated to the 11-year solar cycle. The observed maximum surface pressure response in the North Atlantic occurs 2–4 years after solar maximum, and some model studies have identified that atmosphere–ocean feedbacks explain the multi-year lag. Alternatively, medium-to-high energy electron (MEE) precipitation, which peaks in the declining phase of the solar cycle, has been suggested as a potential cause of this lag. We use a coupled (ocean–atmosphere) climate prediction model and a state-of-the-art MEE forcing to explore the respective roles of irradiance and MEE precipitation on the NAO variability. Three decadal ensemble experiments were conducted over solar cycle 23 in an idealized setting. We found a weak ensemble-mean positive NAO response to the irradiance. The simulated signal-to-noise ratio remained very small, indicating the predominance of internal NAO variability. The lack of multi-annual lag in the NAO response was likely due to lagged solar signals imprinted in temperatures below the oceanic mixed-layer re-emerging equatorward of the oceanic frontal zones, which anchor ocean–atmosphere feedbacks. While there is a clear, yet weak, signature from UV irradiance in the atmosphere and upper ocean over the North Atlantic, enhanced MEE precipitation on the other hand does not lead to any systematic changes in the stratospheric circulation, despite its marked chemical signatures.

The Atlantic Multidecadal Oscillation controls the impact of the North Atlantic Oscillation on North European climate

2021 ◽  
Author(s):  
Florian Börgel ◽  
Claudia Frauen ◽  
Thomas Neumann ◽  
H. E. Markus Meier
Keyword(s):  
North America ◽  
Spatial Structure ◽  
North Atlantic Oscillation ◽  
North Atlantic ◽  
Atlantic Multidecadal Oscillation ◽  
The North ◽  
European Climate ◽  
The North Atlantic ◽  
The North Atlantic Oscillation ◽  
The Impact

<p>European climate is heavily influenced by the North Atlantic Oscillation (NAO). However, the spatial structure of the NAO is varying with time, affecting its regional importance. By analyzing an 850-year global climate model simulation of the last millennium it is shown that the variations in the spatial structure of the NAO can be linked to the Atlantic Multidecadal Oscillation (AMO). The AMO changes the zonal position of the NAO centers of action, moving them closer to Europe or North America. During AMO+ states, the Icelandic Low moves further towards North America while the Azores High moves further towards Europe and vice versa for AMO- states. The results of a regional downscaling for the East Atlantic/European domain show that AMO-induced changes in the spatial structure of the NAO reduce or enhance its influence on regional climate variables of the Baltic Sea such as sea surface temperature, ice extent, or river runoff.</p>

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