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The topic today is the temperature trend in the Arctic. Of special interest are the hard facts. At Climate4You we find the satellite measured temperature development (UAH) of the Arctic:
We do see a warming over the past 4 decades. Since the El Nino-induced peak of 2016, the temperature has fallen gradually. The coldest temperatures were recorded at the end of the 1980s and early 1990s.
Temperatures - Today - Satellite - Data - Time
At around 1980 similar temperatures as those of today were measured. Unfortunately there is no satellite data for the time before 1979, and so not even a full 60-year ocean cycle is covered, and thus this makes it really difficult to assign warming to man or to natural causes over the recent decades.
Russian Arctic just as warm in the 1930s as today!
Course - Stations - Phase - Arctic - Time
But of course there were weather stations before 1979, and these showed a warming phase in the Arctic already in the 1930s and 1940s, a time when it was just as warm as it is today. Example: Opel et al. 2009 reconstructed the temperature history in the Russian Arctic for the last 100 years using ice cores. The warm maximum occurred in the 1930s and not today:
From 1999 to 2001 a 724 m deep ice core was drilled on Akademii Nauk ice cap, Severnaya Zemlya, to gain high-resolution proxy data from the central Russian Arctic. Despite strong summertime meltwater percolation, this ice core provides valuable information on the regional climate and environmental history. We present data of stable water isotopes, melt-layer content and major ions from the uppermost 57 m of this core, covering the period 1883–1998. Dating was achieved by counting seasonal isotopic cycles and using reference horizons. Multi-annual δ18O values reflect Eurasian sub-Arctic and Arctic surface air-temperature variations. We found strong correlations to instrumental temperature data from some stations (e.g. r = 0.62...
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