Benieuwd wat de sneeuwbedekking in oktober gaat doen. Volgens Cohen zijn er aanwijzingen dat warmte in de herfst leidt tot meer sneeuw, waardoor een verdere afkoeling plaats vindt in de winter.
http://iopscience.iop.org/1748-9326/7/1 ... 014007.pdfIn summary, large-scale cooling has occurred during
boreal winter over much of the NH landmasses over the last
two and a half decades (figure 1(c)). With much attention
on the effects of global warming on the climate system, the
recent severe winter weather has heightened global warming
scepticism among the general public. Traditional radiative
GHG theory and coupled climate models forced by increasing
GHGs alone cannot account for this seasonal asymmetry.
Though we cannot conclude definitively that warming in
the summer and autumn is forcing winter regional cooling,
analysis of the most recent observational and modelling
data supports links between strong regional cooling trends
in the winter and warming trends in the prior seasons.
A warmer, more moisture-laden Arctic atmosphere in the
autumn contributes to an increase in Eurasian snow cover
during that season. This change in snow cover dynamically
forces negative AO conditions the following winter. We
deduce that one main reason for models failing to capture
the observed wintertime cooling is probably their poor
representation of snow cover variability and the associated
dynamical relationships with atmospheric circulation trends
(Hardiman et al 2008, Jeong et al 2011). Incorporation of the
snow cover–AO relationship into seasonal forecasts is shown
to greatly improve their abilities, and hence long-term climate
solutions from coupled climate models may also benefit from
improved snow–AO relationships.
