The observed temperature increase in Western Europe about twice that of the global mean increase. Part 38 in everywhere is warming twice as fast as everywhere else.
Observed development in the Wadden Sea area
The observed temperature increase in Western Europe (including the Wadden Sea area) during the past 50 years is about twice that of the global mean increase (KNMI, 2014; Figure 2). Total temperature increase between 1901 and 2013 equals 1.8 °C of which 1.4 °C were reached between 1951 and 2013 (KNMI, 2014). The higher mean temperatures coincides with a decrease in the number of days with a minimum temperature less than 0 °C and an increase in days with a maximum temperature higher than 20 °C (Sluijter, 2008). In winter (December, January, February), more frequent westerly winds led to milder temperatures. In summer (June, July, August), an increase in solar radiation, mainly due to a reduction in air pollution, contributed to the additional warming (Van Oldenborgh et al. 2009; KNMI, 2014). Based on the Hellmann index for winter severity (Hellmann, 1917), winters after 1998 ranged between normal in the NE part of the Wadden Sea to normal – very mild in the SW part. In 2015 there was a positive phase of the ‘Atlantic Multidecadal Oscillation’ (AMO), but there are indications that this may change in the coming time to a negative phase with less rain and cooler summers (McCarthy et al., 2015), depending on the rate of climate change.
Climate change worse everywhere than everywhere else