The globe is dimmed Science


If you repeatedly looked closely at the Earth, even from the Moon, you could notice that the Earth is a little dimmed.

This has now been measured. A group of atmospheric scientists measured the change in the Earth’s reflectivity, or albedo, over a 20-year period.

The change was observed with the Moon. Reflectivity could be measured when scientists observed from the surface of the Moon how much light is reflected from the surface of the Earth to its surface. Data were accurately collected between 1998 and 2017.

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The results show that the Earth now reflects about half a watt less light per square meter than in 1998. This corresponds to a decrease of about 0.5 percent in reflectivity.

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“Earth shine” was measured in Southern California At the Big Bear Solar Observatory. Data were collected for a total of approximately 1,500 nights.

In total, our planet reflects about 30 percent of the sunlight entering it. An important role here is played by pale clouds and pale polar glaciers.

“The drop in reflectivity was a surprise to us. First, our measurements showed about the same reflectivity for about 17 years. Then the last three years changed the curves, ”the physicist Philip Goode The U.S. Institute of Geophysics reports about the New Jersey Institute of Technology in the research bulletin.

The cause of dimming is the warm waters of the Pacific.

Satellite measurements suggest that much-reflecting and low-moving clouds have declined in the eastern Pacific, where surface waters have also warmed a lot.

Goode says CNN: wherethat seawater warming has affected jet currents and as a result clouds near the west coast of South and North America “burn off”.

The dimming of the Earth also means that somewhat more of the Sun’s energy remains on the Earth. If the Earth continues to dim, it threatens to warm our planet even more.

Many scientists had hoped that a warmer Earth would produce more clouds, allowing the Earth to reflect more sunlight into space.

That, in turn, would curb warming and balance the climate, he says Edward Schwieterman, University of California Geophysicist.

“But now things seem to be going the other way around,” he says.

Schwieterman was not involved in the study.

The study was published in a scientific journal Geophysical Research Letters.


Source: Tiede by www.tiede.fi.

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