OCT 12, 2018 5:34 AM PDT

How the Sahara ended up in the Arctic

The polar jet is an atmospheric circulation that is capable of transporting dust and warm, moist air from subtropics and mid-latitudes to the Arctic. This is a severe concern because roughly half of the warming in the Arctic is now being placed on higher levels of moisture and heat transported to the region from elsewhere.

Researchers at NYU Abu Dhabi recently reported that this meandering polar jet stream is depositing not only warm, moist air, but also hot dust from the Sahara Desert to the Arctic Circle. They collected data that shows that as a result of this deposit of warm dust, southeastern Greenland experienced higher surface temperatures (a 10-degree Celsius rise) for over three consecutive days. Such heightened temperatures greatly impacted ice melt in the region, which is already under great stress from climate change.

"The polar jet stream has been identified as the main driver for such events leading to the transport of large amounts of dust to high-latitudes," said Diana Francis, the lead researcher on this study. "If the polar jet is set to slow more frequently due to the changes in the Arctic climate system and to the Arctic Amplification, such events are expected to become more frequent."

Satellite images captured the plume of dust covering the Arctic. Photo: NESDIS - National Oceanic and Atmospheric Administration

The study was initiated in part because of a 2011 cyclone over Morocco that transported 38 million ton of dust, depositing 1.3 million tons of it in the Arctic. From this research, the scientists were able to determine that this meandering polar jet has the largest capability to transport dust because of its geographic location and close proximity to the pole. This means that dust is able to travel 4,000km over just three or four days.

“Before, many studies pointed out pathways through Europe or through the Atlantic around the Bermuda High, very long pathways where most of the dust settles in the ocean or over Europe on its way to the Arctic,” said Francis. “But this pathway is very short and reaches the Arctic in a few days, which means most of the dust is directly injected in the Arctic.”

The scientists urge that more research is needed in order to understand the atmospheric circulation of the polar jet. "The impact of dust deposition on ice in Greenland, such as darkening ice and formation of algae on ice or cryoconite, as well as the link between Saharan dust transport and the Arctic heat dome must be investigated further in collaboration with scientists in UK and Germany," Francis stressed. With such research, better models could be made projecting sea level rise and global temperature changes. The study was published in the Journal of Geophysical Research: Atmospheres.

Sources: Science Daily, The National, Journal of Geophysical Research: Atmospheres

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 31, 2020
Chemistry & Physics
Advancing Nuclear Fusion by Taming the "Chirping" Plasma
JUL 31, 2020
Advancing Nuclear Fusion by Taming the "Chirping" Plasma
2020 turns out to a year of breakthrough for nuclear fusion. The world's largest fusion project ITER (International ...
AUG 03, 2020
Earth & The Environment
What the heck are biocrusts and why are they so important?
AUG 03, 2020
What the heck are biocrusts and why are they so important?
Have you ever heard of biocrusts? No, it’s not a new kind of pizza crust. Biocrusts refer to a group of tiny deser ...
AUG 14, 2020
Plants & Animals
Tracking the Iconic American Bison
AUG 14, 2020
Tracking the Iconic American Bison
The Great Plains of Montana are home to one of the United States' largest land restoration projects, known as the Am ...
SEP 17, 2020
Earth & The Environment
Concerns about carbon monoxide concentrations from CA's wildfires
SEP 17, 2020
Concerns about carbon monoxide concentrations from CA's wildfires
As California faces its worst wildfire season yet, with 28 major fires burning throughout the state as of September 14, ...
OCT 09, 2020
Plants & Animals
Humpback Whales Thriving in NYC Waters
OCT 09, 2020
Humpback Whales Thriving in NYC Waters
Over the past decade, humpback whales have become increasingly common in waters known as the New York-New Jersey Bight. ...
OCT 26, 2020
Microbiology
A Network of Fungi Helps Trees Grow
OCT 26, 2020
A Network of Fungi Helps Trees Grow
Trees rely on a network of fungal friends for good health. Communities of trees can share nutrients and other essentail ...
Loading Comments...