JAN 05, 2020 6:30 AM PST

Frozen rivers on the decline

A study entitled, "The past and future of global river ice," is the first comprehensive study to quantify temporal shifts in river ice cover on such a large scale. Published recently in the journal Nature, it comes from researchers in the University of North Carolina at Chapel Hill Department of Geological Sciences who found that annual river ice cover is expected to decline by approximately six days for every one degree Celsius increase in global temperatures.

It may surprise you to know that over half of all large rivers on the planet freeze annually. And while those of us who are not close to frozen rivers may be unaware of their importance, for the communities and industries that live near them, the annual freeze is crucial. But ice cover is key not only from an economic and survival perspective for these high-latitude communities; it is also key for all of us because of how it regulates the greenhouse gasses released from rivers into Earth's atmosphere.

To conduct this study, the researchers analyzed changes in river ice cover in satellite imagery for a period of over three decades. Lead author, Xiao Yang, a postdoctoral scholar in the UNC-Chapel Hill geological sciences department, explains:

"We used more than 400,000 satellite images taken over 34 years to measure which rivers seasonally freeze over worldwide, which is about 56% of all large rivers. We detected widespread declines in monthly river ice coverage. And the predicted trend of future ice loss is likely to lead to economic challenges for people and industries along these rivers, and shifting seasonal patterns in greenhouse gas emissions from the ice-affected rivers."

The team used a comparison of river ice cover from 2008-2018 and 1984-1994 (in which they saw a monthly global decline ranging from 0.3-4.3%) to develop and calibrate a model based on temperature and season under climate change predictions that allowed them to project future changes in river ice extent. Using this model, the team projected river ice cover through 2009-2029 and 2080-2100 and found that ice cover will drop monthly in the Northern Hemisphere in a range from 9-15% in the winter months and 12-68% during the spring and fall.

What will be the fate of frozen rivers? Photo: Pixabay

Whereas the past observations showed the largest drops of river ice cover to occur in the Tibetan Plateau, eastern Europe, and Alaska, the model predicts future declines will be most prevalent in the Rocky Mountains, the northeastern United States, eastern Europe, and Tibetan Plateau.

"Ultimately, what this study shows is the power of combining massive amounts of satellite imagery with climate models to help better project how our planet will change," said UNC-Chapel Hill Associate Professor of global hydrology Tamlin Pavelsky. "The observed decline in river ice is likely to continue with predicted global warming,” concludes the study.

Sources: Nature, Science Daily

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
JUL 15, 2020
Chemistry & Physics
New report analyzes the efficiency of 6 different fiber-catching devices
JUL 15, 2020
New report analyzes the efficiency of 6 different fiber-catching devices
A study from the University of Plymouth International Marine Litter Research Unit has released a report analyzing the ef ...
AUG 02, 2020
Earth & The Environment
Scientists capture the seismic signals of the aurora borealis
AUG 02, 2020
Scientists capture the seismic signals of the aurora borealis
A team of seismologists reports capturing the aurora lights not on cameras, but on seismometers. They say that three 201 ...
SEP 03, 2020
Earth & The Environment
Falling mite populations warn of global diversity crash
SEP 03, 2020
Falling mite populations warn of global diversity crash
Researchers from the University of Queensland have conducted the first-ever global mite biodiversity study and their fin ...
OCT 02, 2020
Chemistry & Physics
A New Way of Building Houses: 3-D Printing with Clay
OCT 02, 2020
A New Way of Building Houses: 3-D Printing with Clay
Our ancestors had a long history of building dwelling structures using clay and plant-based fibrous materials. Even thes ...
OCT 09, 2020
Earth & The Environment
Machine learning + history = more accurate sea-level rise
OCT 09, 2020
Machine learning + history = more accurate sea-level rise
Researchers yet again toward our planet’s past to understand what might be in store for our future. In a new study ...
OCT 30, 2020
Earth & The Environment
Malaria stays dormant in the human bloodstream during the dry season
OCT 30, 2020
Malaria stays dormant in the human bloodstream during the dry season
A new study led by researchers from the University of Heidelberg in Germany details the mechanism by which the malaria-c ...
Loading Comments...