Category Archives: Atlantic

Atlantic overturning in decline?

Recent direct observations of the strength of the Atlantic Meridional Overturning Circulation (AMOC) show a decline of 10-15% since 2004. Is this a temporary fluctuation or part of a longer-term decline? A new analysis suggests that we might expect a … Continue reading

Posted in Atlantic, MOC, observations, variability | 4 Comments

Predicting changes in North Atlantic temperatures

The Earth is a complex system of interacting components, such as the atmosphere and ocean, which produce a wide variety of natural variability. This natural variability ensures that the evolution of a particular region’s climate, e.g. that of Western Europe, … Continue reading

Posted in Atlantic, GCMs, MOC, predictability, SSTs, variability | 1 Comment

Reconstructing Atlantic atmospheric variability

In a previous post I discussed the Old Weather project which is using volunteers to transcribe the hand-written weather data from Royal Navy ships logs in the World War 1 period. The good news is the first 243 ships have … Continue reading

Posted in Atlantic, history, variability, weather | 4 Comments

Hysteresis of the Atlantic MOC in an AOGCM

UPDATE (16/06/11) – the paper describing this work has now been published and highlighted. The potential for a rapid collapse in the strength of the Atlantic overturning circulation (AMOC) has long been recognised. The pioneering work of Stommel first suggested … Continue reading

Posted in Atlantic, GCMs, hysteresis, MOC | Leave a comment

Atlantic multi-decadal variability

Observations of Atlantic SSTs show significant multi-decadal variability since 1870 (see red line in figure 2 below), often termed the Atlantic Multi-Decadal Oscillation (AMO), though there is no clear evidence that it is really an ‘oscillation’.

Posted in Atlantic, GCMs, SSTs, variability | 2 Comments