• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

Earth Wise

A look at our changing environment.

  • Home
  • About Earth Wise
  • Where to Listen
  • All Articles
  • Show Search
Hide Search
You are here: Home / Archives for albedo

albedo

Large Mammals And Climate Change | Earth Wise         

April 14, 2022 By EarthWise Leave a Comment

The natural world has an important part to play in mitigating the effects of climate change.  We mostly think about the role of plant life which absorbs carbon in trees, grasses, and other flora.  However, a new study published by Oxford University looks at the role of large wild animals in restoring ecosystems and reducing the effects of climate change.

According to the study, there are three important ways in which large animals such as elephants, rhinos, giraffes, whales, bison, and moose can potentially mitigate the effects of climate change:  carbon stocks, albedo, and fire regimes.

When large herbivores graze, they disperse seeds, clear vegetation, and fertilize soil.  All of these things build more complex and resilient ecosystems which helps to maintain and increase carbon stocks in the soil and in plant tissues thereby helping to reduce CO2 in the atmosphere.

Grazing large animals trample vegetation which opens up areas of dense vegetation to create open mixes of grass and shrubs and can reveal snow-covered ground in cold regions.  Such open habitats are lighter in color (higher in albedo) and reflect more solar radiation into the atmosphere, cooling the Earth’s surface rather than heating it up.

Large grazing animals can lessen wildfire risk by browsing on woody vegetation that would otherwise fuel the fires and also by creating paths that act as firebreaks.

In marine ecosystems, whales and other large animals fertilize phytoplankton, which capture some 37 billion tons of CO2 each year.

Overall, large animals are an important part of the natural world’s ability to reduce the effects of the changing climate by helping with localized adaptation to the changes taking place in ecosystems.

**********

Web Links

Large mammals can help climate change mitigation and adaptation

Photo, posted August 20, 2017, courtesy of Jon Niola via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

The Earth Is Dimming | Earth Wise

November 3, 2021 By EarthWise Leave a Comment

According to a new study published in the journal Geophysical Research Letters, warming ocean waters have caused a drop in the brightness of the earth.

Researchers measure the earth’s albedo by observing the light reflected from earth that illuminates the surface of the moon as well as with satellite measurements. The earth reflects about 30% of the sunlight that shines on it.  The data shows that the earth now reflects about half a percent less light than it did 20 years ago, with most of the drop occurring in the last three years.  That number had been fairly constant for most of the past 20 years.

According to the researchers at the New Jersey Institute of Technology, New York University, and a Spanish astrophysical agency, the apparent cause of the albedo drop has been a reduction of bright, reflective low-lying clouds over the eastern Pacific Ocean in most recent years.  That is the same area off the west coasts of North and South America where increases in sea surface temperature have been observed because of the reversal of a climate condition called the Pacific Decadal Oscillation, which is likely a result of global climate change.

The dimming of the earth implies that more solar energy is being absorbed rather than reflected, which may contribute further to global warming.

These results are somewhat surprising.  Scientists had postulated that the warming of the earth could lead to more clouds and therefore a higher albedo – more reflection of the sun’s light.  If that were the case, it would help to moderate warming and balance the climate system.  These new results indicate that the opposite is true.

**********

Web Links

The Earth Is Dimming Due To Climate Change

Photo, posted August 18, 2021, courtesy of Arek Socha/GPA Photo Archive via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Algae And The Greenland Ice Sheet

February 2, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/02/EW-02-02-18-Algae-and-the-Greenland-Ice-Sheet.mp3

The Greenland Ice Sheet is the second largest ice body in the world, after the Antarctic ice sheet.  It is about 1,500 miles long, nearly 900 miles across at its widest point, and averages more than a mile in thickness.  It has experienced record melting in recent years and is a source of great concern as the climate continues to warm. The Greenland Ice Sheet is losing an estimated 270 billion tons of ice each year.   If the entire sheet were to melt, global sea levels would rise by 24 feet which, of course, would be a world-wide catastrophe.

[Read more…] about Algae And The Greenland Ice Sheet

Disappearing Arctic Ice

October 25, 2016 By WAMC WEB

https://earthwiseradio.org/wp-content/uploads/2016/10/EW-10-25-16-Disappearing-Arctic-Ice.mp3

The top of the world is turning from white to blue in the summer.  The ice that has long covered the north polar seas is melting away.

[Read more…] about Disappearing Arctic Ice

Primary Sidebar

Recent Episodes

  • Sea Level Rise And Global Security | Earth Wise
  • Keeping The Keeling Curve Going | Earth Wise
  • Great Salt Lake In Danger | Earth Wise
  • Distributed Wind Energy | Earth Wise
  • Solar Power At Night | Earth Wise

WAMC Northeast Public Radio

WAMC/Northeast Public Radio is a regional public radio network serving parts of seven northeastern states (more...)

Copyright © 2023 ·