SEP 01, 2017 2:16 PM PDT

What does the dust blow in?

You may be surprised by what the wind gusts around the world. Scientists know that dust from Asia blows across the Pacific on jet stream currents carrying pollution, soil, sediments, and other chemicals. Knowing where such dust is coming from can help us understand atmospheric circulation, contaminant pathways, and even climate patterns; but determining the point source of such dust isn’t easy.

In order to do it, a team of scientists used cathodeluminescence (CL) spectral analysis of tiny quartz grains to differentiate between the Gobi and the Taklimakan Deserts, two main Chinese dust sources. "The cathodoluminescence spectra of single quartz grains provide crystal-chemical features in quartz, such as impurities and imperfections," explains leader Kana Nagashima. Those features, she says, vary with the conditions of quartz formation and later geological events such as metamorphism.

CL spectroscopy is a technology that is able to distinguish impurities and imperfections in crystal-chemical features in quartz that depend on the conditions affecting quartz from the beginning of its formation toward present day, explains the study. Analyzing this geologic history means that the scientists can draw conclusions on which characteristics signify which source points.

Source rocks of the Gobi Desert have a lot of volcanic rock while those from the Taklimakan don’t have as much volcanic composition. Because of this known difference, the researchers collected dust grains collected from loess, riverbeds, and sand dunes; they looked at 268 quartz grains from the Gobi and 311 grains from the Taklimakan to see if the difference would carry over to the dust.

The weather phenomenon called Yellow Sand or Asian Dust has been known to engulf cities in South Korea. Photo: Stars and Stripes

The scientists had the right hunch; their results showed that certain crystal-chemical characteristics matched the percent of different rock types from each desert. This has big implications: we will now be able to use CL spectroscopy techniques in order to better comprehend the ways that dust affect global climate.

Sources: Science Daily, Geological Society of America

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
DEC 22, 2019
Earth & The Environment
DEC 22, 2019
Australia on fire
Australia is in a national state of emergency as fires ravage cities and rural areas around the country. One map circulating the media from the Government ...
JAN 13, 2020
Plants & Animals
JAN 13, 2020
An Albatross Mother's Work is Never Done
Albatross chicks are naturally flightless, and this increases their dependence on their parental units to bring back food for them to eat. In this chick&rs...
JAN 15, 2020
Earth & The Environment
JAN 15, 2020
2019 Was The Second Warmest Year on Record
Independent analyses from NASA and the National Oceanic and Atmospheric Administration (NOAA) have confirmed that 2019 was the second warmest year on recor...
JAN 20, 2020
Plants & Animals
JAN 20, 2020
Horned Lizards Do Anything to Protect Their Eggs From Predators
When a female horned lizard lays her eggs, she finds herself up against several predators that want to devour them. Fortunately, the female horned lizard d...
JAN 26, 2020
Microbiology
JAN 26, 2020
The Planet's Soil is Home to Microbe-Eating Protists
Protists don't fit neatly into any other category of organism; they are eukaryotes, but they are not a plant, fungi or animal....
JAN 27, 2020
Earth & The Environment
JAN 27, 2020
Study Suggests That Vineyards can Adapt to Climate Change
Researchers from the University of British Columbia (UBC) have some good news for wine lovers. Delicate wine grapes are highly susceptible to changes in te...
Loading Comments...