Earth Is Dimming Due To Climate Change

By NAPS (North American Precis Syndicate)
on November 23, 2021

(NAPSI)—Warming ocean waters have caused a drop in the brightness of the Earth, according to recent research. 

Scientists used decades of measurements of earthshine—the light reflected from Earth that illuminates the surface of the Moon—as well as satellite measurements to find that there has been a significant drop in Earth’s reflectance, or albedo, over the past two decades.

 

The Earth is now reflecting about half a watt less light per square meter than it was 20 years ago, with most of the drop occurring in the last three years of earthshine data, according to the new study in the AGU journal Geophysical Research Letters, which publishes high-impact, short-format reports with immediate implications spanning all Earth and space sciences. That’s the equivalent of 0.5% decrease in the Earth’s reflectance. Earth reflects about 30% of the sunlight that shines on it. 

 

“The albedo drop was such a surprise to us when we analyzed the last three years of data after 17 years of nearly flat albedo,” said Philip Goode, a researcher at New Jersey Institute of Technology and the lead author of the new study, referring to earthshine data gathered by the Big Bear Solar Observatory in Southern California. When the latest data were added to the previous years, the dimming trend became clear.

 

Two things affect the net sunlight reaching the Earth: the Sun’s brightness and the planet’s reflectivity. The changes in Earth’s albedo observed by the researchers did not correlate with periodic changes in the Sun’s brightness, so that means changes in Earth’s reflectiveness are caused by something on the Earth.

 

Specifically, there has been a reduction of bright, reflective low-lying clouds over the eastern Pacific Ocean in the most recent years, according to satellite measurements made as part of NASA’s Clouds and the Earth’s Radiant Energy System (CERES) project.

 

That’s the same area, off the west coasts of North and South America, where increases in sea surface temperatures have been recorded because of the reversal of a climatic condition called the Pacific Decadal Oscillation, with likely connections to global climate change.

 

The dimming of the Earth can also be seen in terms of how much more solar energy is being captured by Earth’s climate system. Once this significant additional solar energy is in Earth’s atmosphere and oceans, it may contribute to global warming, as the extra sunlight is of the same magnitude as the total anthropogenic climate forcing over the last two decades.

 

“It’s actually quite concerning,” said Edward Schwieterman, a planetary scientist at the University of California at Riverside who was not involved in the new study. For some time, many scientists had hoped that a warmer Earth might lead to more clouds and higher albedo, which would then help to moderate warming and balance the climate system, he said. “But this shows the opposite is true.”

 

Learn More

 

For further facts and stats, you can visit AGU at www.news.agu.org. AGU supports 130,000 enthusiasts to experts worldwide in Earth and space sciences. Through broad and inclusive partnerships, it advances discovery and science that accelerates knowledge and creates solutions that are ethical, unbiased and respectful of communities and their values. 

 

On the Net:North American Precis Syndicate, Inc.(NAPSI)

Get Top Stories Delivered Weekly

Recent ramaponews News Articles

GET TOP STORIES DELIVERED WEEKLY

FOLLOW OUR NEWSPAPER

Ramapo students consult with LASIK NJ doctors before deciding on whether to have LASIK surgery.

Log In

or Create an account

Employers & Housing Providers

Employers can list job opportunities for students

Post a Job

Housing Providers can list available housing

Post Housing

Log In

Forgot your password?

Your new password has been sent to your email!

Logout Successful!

Please Select Your College/University:

You just missed it! This listing has been filled.

Post your own housing listing on Uloop and have students reach out to you!

Upload An Image

Please select an image to upload
Note: must be in .png, .gif or .jpg format
OR
Provide URL where image can be downloaded
Note: must be in .png, .gif or .jpg format