ALASKA, Alaska — A new NASA study has found that there’s no evidence that global warming is causing a warming of the northern hemisphere.
A team of researchers based in Australia and the United States studied the Northern Hemisphere data from NASA’s Earth-observing satellites over the past 30 years and found that they didn’t find any warming or cooling trends in the northern parts of the planet, or regions that receive the most extreme heat and cold.
The researchers analyzed data from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard NASA’s Terra satellite and concluded that global temperatures have been stable over the last 30 years, but the northern regions have warmed significantly.
“The northern polar regions of the Northern hemisphere have been warming at a slower rate than the southern regions, indicating a cooling effect of the sun,” said the study’s lead author, Paul Stolzenberg of the University of Bristol in the United Kingdom.
This cooling effect has persisted for many years and continues today, he added.
In an accompanying commentary, Stolzberg said that “we’re looking at a very small temperature increase in the Northern and Southern hemispheres during the past few decades that has a significant impact on weather in the entire Northern Hemisphere, as well as in parts of Africa, and Australia and New Zealand.”
This is the first time we’ve found a cooling trend in the southern hemisphere, Stoltzberg wrote.
It’s important to note that we haven’t found any warming in the tropics, or even tropical oceans, Stolys wrote.
Instead, the cooling trend is found in the North Atlantic.
NASA Goddard Space Flight Center, Greenbelt, Md., manages the Goddard Spaceflight Center for NASA.
For more information about climate change, visit: www.nasa.gov/climatechange.