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In 1998 D. Dahl-Jensen et al. pointed out in the journal Science that the 1930s is 0.5°K warmer than the present time based on a bore-hole study of Greenland ice sheet.
The following data support D. Dahl-Jensen’s findings, from Soon 2012.
Heat - Waves - USA
Also heat waves were far worse across the USA in the 1930s:
More heat waves in the 1930s.
Hurricane - Labor - Day - Hurricane - Hurricane
The strongest hurricane was the Labor Day hurricane, which hit in 1935. Hurricane Irma and Harvey had much higher central pressure at landfall. (U.S .National Hurricane Center):
Strongest hurricane occurred in the 1930s.
Parts - Arctic
Parts of the Arctic were warmer in the 1930s:
Source: Real Climate Science.
Arctic - Sea - Ice - Levels - Today
Arctic sea ice levels were just as low in the 1930s as they are today:
Read more here.
Data - Activity - Change - Index - Oscillation
The climatic data above can be understood with solar activity change (aa Index) and ocean oscillation (Pacific Decadal Oscillation Index), see the 2 charts that follow.
The Pacific Decadal Oscillation (PDO) index was also in its warm phase during the 1930s:
PDO - Index - From1925 - To1945 - Data
PDO index was positive from1925 to1945. Data: Japan Meteorological Agency.
In summary, increasing solar activity with positive PDO index caused the warmer period of...
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