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Greenland ice cores show record of acid rain, success of U.S. Clean Air Act

RATE THIS! +6
Posted in Science on 13th Apr, 2014 11:56 PM by AlexMuller

The rise and fall of acid rain is a global experiment whose results are preserved in the geologic record. By analyzing samples from the Greenland ice sheet, atmospheric scientists found clear evidence of the U.S. Clean Air Act. They also discovered a link between air acidity and how nitrogen is preserved in layers of snow.

 
Forty-five years ago, acid rain was killing fish and dissolving stone monuments on the East Coast. Air pollution rose beginning with the Industrial Revolution and started to improve when the U.S. Clean Air Act of 1970 required coal power plants and other polluters to scrub sulfur out of their smokestacks.
 
UW researchers began their study of ice cores interested in smog, not acid rain. They discovered a link between the two forms of pollution in the geologic record.
 
Nitrogen is emitted as a short-lived compound, NOx, which causes ground-level ozone, the main ingredient in smog, and relates to compounds that are the “detergent” of the atmosphere. Sources of NOx include smokestacks and vehicle tailpipes, as well as wildfires, soil microbes or reactions triggered by lightning strikes.

Tags: iceacid rainair pollutionGreenland

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Comments

Author: Guest
Posted: 2014-04-14
+1
This just shows how how careful research and recordings can help tackle issues of pollution Reply
Author: Guest
Posted: 2014-04-14
+1
Ice cores from Greenland and North American lake sediments showed the nitrogen-15 ratio gradually decreasing since 1850, suggesting a corresponding rise in human emissions. This new research says: not so fast. This shows that the relationship between emissions and the isotopes is less direct than we thought. Reply


 

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