reported Wednesday that global
warming was interrupted in 1970 when a cold snap in northern
oceans caused world temperatures to temporarily decrease.
1968 and 1972, temperature records show that sea surface temperatures
in the Northern Hemisphere dropped 0.3 degrees Celsius (0.5 F)
rapidly. This occurred mainly in the North Atlantic, and scientists
used to think it was just a side effect of the slow build up of air
from cars and power plants, which blocked sunlight.
now, American and British scientists, who examined the above
mentioned temperature records, are saying that the sudden temperature
drop in 1970 occurred during the same time as a "sudden inflow
of cold water from the Arctic." This flow of cold, fresh water
into the North Atlantic is known as the "Great Salinity
Anomaly," and the scientists believe a cold spell in these
oceans led to a decrease in world temperatures, resulting in a
momentary pause in the global
scientists, led by David Thompson, lead author of the study at
Colorado State University, found the temperature drop after
eliminating other factors that can block sunlight, such as volcanic
ash blocking sunlight and long-term shifts in ocean temperatures and
knew that the Northern Hemisphere oceans cooled during the mid 20th
century, but the sudden nature of that cooling surprised us,"
findings of Thompson and his co-author of the study, Phil Jones, of
Britain's University of East Anglia, sharply contrast all previous
predictions surrounding this temperature decrease from 1968 to 1972
because this new study notes that this "pulse" of cooler
temperatures seemed to occur due to natural variations rather than
one is postulating that the 'Great Salinity Anomaly' has any
relationship to warming or the greenhouse effect from humans,"
contrast, the U.N. panel of climate scientists mentioned that average
world temperatures have increased by 0.7 degrees Celsius since the
Industrial Revolution. Sea ice is made of fresh water, and with
fossil fuels emitting carbon dioxide and supposedly warming world
temperatures since the Industrial Revolution, sea
ice in the Arctic could have melted and flowed into the
North Atlantic due to man-made activity.
was involved with the hacked e-mails at the University of East Anglia
in 2009, and was accused of exaggerating evidence that supports
global warming. After a review, he was reinstated and all accusations
were cleared. Now, when asked how he thinks climate skeptics will
react when he releases this study "highlighting the cause of
cooling rather than warming," Jones said, "Maybe it will
get them thinking."
study was published in Nature this