1 Variations in power input to the ocean using a recent global “reanalysis” extending back 2 to 1871 shows a strong trend in the net power input since then, a trend dominated by 3 the Southern Ocean region. This trend is interpreted as a spurious result of the changing 4 observational system. Focussing therefore, on the North Atlantic, where the data base is 5 somewhat more secure, the input po...

The dynamical mechanisms for the late-winter teleconnection between El NiñoSouthern Oscillation (ENSO) and the North Atlantic Oscillation (NAO) are examined using output from two global climate models and various reanalysis datasets. During El Niño winters, the intensified transient disturbances along the equatorward shifted North Pacific storm track extend their influences farther downstream, ...

Climate influences the dynamics of natural populations by direct effects over habitat quality but also modulating the phenotypic responses of organisms' life-history traits. These responses may be different in males and females, particularly in dimorphic species, due to sex-specific requirements or constraints. Here, in a coastal seabird, the European shag (Phalacrocorax aristotelis), we studie...

Abstract The atmospheric impact on sea level variability in the Baltic Sea different time scales was investigated. Northern Hemisphere teleconnection patterns, namely, North Atlantic Oscillation (NAO), Arctic (AO) and Scandinavia (SCAND) were employed, a strong but non-stationary relationship found. SCAND appeared to be most relevant mean monthly variations throughout year. A negative correlati...

Observed sea surface temperatures (SSTs) in the North Atlantic from 1958 through 2000, as well as data from an ocean model simulation driven with the atmospheric variability observed during the same period, are examined using multichannel singular spectrum analysis. The two leading oscillatory modes are associated with a multidecadal and a quasi-decadal period. The former is connected to a basi...

Recently, Ottersen et al. (2001) reviewed the ecological impacts of the North Atlantic climate oscillation (NAO). The NAO is responsible for interannual and decadal fluctuations in winter temperatures, precipitation, wind conditions as well as distribution and fluxes of currents on both sides of the North Atlantic Ocean (Hurrell and van Loon 1997). A highly positive NAO index (measured as the d...

During the twentieth century sea surface temperatures in the Atlantic Ocean exhibited prominent multidecadal variations. The source of such variations has yet to be rigorously established—but the question of their impact on climate can be investigated. Here we report on a set of multimodel experiments to examine the impact of patterns of warming in the North Atlantic, and cooling in the South A...

Understanding and predicting the state of North Atlantic Oscillation (NAO) is key to forecasting weather in United Kingdom (UK). It has been shown that particular phases Madden–Julian (MJO) act as precursors either NAO+ or NAO? events. We assess ability UK Met Office coupled climate model (HadGEM3-GC3.1-MM) simulate these NAO responses at lead times 1–2 weeks show improvements are needed modell...

Major low-latitude volcanic eruptions cool Earth’s climate, and can lead to a positive phase of the North Atlantic Oscillation (NAO) during winter. However, question climate circulation impact Northern Hemisphere high-latitude has received less attention. Here we show that, contrary eruptions, response be associated with negative NAO both winter summer. We furthermore demonstrate that also prev...

Amidst stormy atmospheric circulation, there are prominent recurrent patterns of variability in the planetary circulation, such as the Antarctic Oscillation (AAO), Arctic Oscillation (AO) or North Atlantic Oscillation (NAO), and the Pacific–North America (PNA) pattern. The role of the synoptic eddy and low-frequency flow (SELF) feedback in the formation of these dominant low-frequency modes is ...