Abstract
Between the 1940s and the 1960s there was a significant lowering of the surface temperatures of the central North Pacific. This cool-down is discussed on the basis of analyses of a very large surface temperature data base, covering most of the North Pacific, which began in 1947 and continued for at least 30 years afterwards. A surface area more than 20 degrees of latitude by approximately 70 degrees of longitude, centered on 40°N, cooled down within about a ten year period by typically 0.5℃ and by as much as 1.0℃. Previously a permanent surface and near surface circulation was proposed in which a shallow very broad warm surface layer flows northeastward at mid-latitudes on the eastern side of the North Pacific while colder water returns southward to the east, west and underneath the warm surface current. It is suggested that variations in this hypothesized circulation, due to natural causes not yet completely understood, potentially provide a mechanism for producing a cooling down (or warming up) of a large region of the central North Pacific at mid-latitudes in a relatively short period of time (ten years or less).
Highlights
Between the 1940s and the 1960s there was a significant lowering of the surface temperatures of the central North Pacific
From data analyses published earlier [5,Figure 1] comes the educated guess that a large slice of the North Pacific was cooling down simultaneously with the US within about a 30 year period starting in 1947
An examination of the cool-down is presented which is expanded from a single latitude line (35°N) to a band of latitudes (30-50°N) but at the same time more narrowly focused in time: the most intense period of cooling is condensed from 30 to 10 years
Summary
“The earth’s average surface temperature has increased by about 1.2°F in the past century, with most of the increase occurring from about 1920 to 1950, and again beginning around 1975” [1]. Though not explained either, is the fact that the annual mean temperature of the United States as a whole lowered between about 1953 and 1968 by roughly 0.7°C [3] It is shown below, through analyzing an extensive set of sea surface temperature data, involving millions of ship injection temperatures [4], that the temperature of most of the North Pacific Ocean’s surface waters dropped, in the mean, by around 0.5°C within a ten year span between about 1949 and 1959. On global warming and climate change is that they are long on discussion but short on data presentation In this brief journal article an effort is made to have a more balanced account. It appears that nobody has yet studied the particular North Pacific SST data base in terms of short period climate variations in the way I have chosen to look at these observations here
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