Temperature

 

Understanding Global Warming

Temperature is getting more pleasant

Figure 1. Hadley Centre Central England Temperature (HadCET) dataset + DMI+ NOAH


The CET dataset represents the world’s longest continuous instrumental temperature record. Danish temperature data have been superimposed for comparison. The earliest Danish measurements were taken from the top of the Round Tower in Copenhagen and subsequently converted to a national average, with an estimated uncertainty of ±0.5 °C.

Also shown are global temperature values from NOAA (National Oceanic and Atmospheric Administration), adjusted by adding 13.7 °C (the IPCC’s assumed preindustrial average) plus global anomaly for 1980 +0.51 °C, resulting in an approximate absolute temperature of 14.2 °C. 

All three datasets begin to show a consistent warming trend from the mid-1970s onward, coinciding with the start of satellite-based temperature measurements in 1978.

England - once part of our North Sea Empire - now a neighbor 300 nautical miles to the west, from where we get most of our weather. This is significant because here close to us, instrumental temperatures are dating back to the middle of the 500-year cool period referred to as The Little Ice Age - link. Denmark - Link.

The graph clearly shows how we gradually came out of the cold and into the Modern Warm Period. From the oldest measurement in 1659 and up to now, a trend of 0.28 oC per 100 years can be read. The temperature has rised 1,2 oC in the period. We must go back to 1700 to find a faster and longer-lasting rise than the one we have just experienced (the one predicted by Willi Dansgaard).  In Jutland and islands, the temperature range goes back to 1786. A couple of peaks and valleys in the Danish temperature record are related to similar variation in sunshine – hyperlink.

Figure 2. Old aerial photograph from Knud Rasmussen's and Lauge Koch's expedition


Our northernmost regions are heavily influenced by the periodic Atlantic Multidecadal Oscillation (AMO). The warm before World War II is very clear here and the same warm is happening again right now. The AMO has a periodicity of 60–80 years (Fig.2).  

Old aerial photographs from Knud Rasmussen's and Lauge Koch's expeditions in Southeast Greenland in the 1930s show a glacier landscape very much like the one we have now - hyperlink.

Figure 3.The Atlantic Multidecadal Oscillation (AMO) with a periodicity of 60–80 years. The cyclical variation with high temperatures in 30’s and now is seen in Greenland and somewhat weaker in Torshavn.

Understanding Global Warming, Oversigt - LINK

lt January 3, 2021.

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