About My Health Careers Internship MedBlogs Contact us
Medindia LOGIN REGISTER
Advertisement

Global Warming Predictions may be Exaggerated

by Hannah Punitha on November 22, 2008 at 6:37 PM
Font : A-A+

 Global Warming Predictions may be Exaggerated

A detailed analysis of black carbon, in computer climate models, has suggested that those models may be overestimating global warming predictions.

Savanna fires occur almost every year in northern Australia, leaving behind black carbon, which is the residue of burned organic matter that remains in soil for thousands of years.

Advertisement

A new study, by researchers at Cornell University, quantified the amount of black carbon in Australian soils and found that there was far more than expected, according to Johannes Lehmann, a Cornell professor of biogeochemistry.

As a result of global warming, soils are expected to release more carbon dioxide, the major greenhouse gas, into the atmosphere, which, in turn, creates more warming.
Advertisement

limate models try to incorporate these increases of carbon dioxide from soils as the planet warms, but results vary greatly when realistic estimates of black carbon in soils are included in the predictions, the study found.

Soils include many forms of carbon, including organic carbon from leaf litter and vegetation and black carbon from the burning of organic matter.

It takes a few years for organic carbon to decompose, as microbes eat it and convert it to carbon dioxide.

But, black carbon can take 1,000-2,000 years, on average, to convert to carbon dioxide.

By entering realistic estimates of stocks of black carbon in soil from two Australian savannas into a computer model that calculates carbon dioxide release from soil, the researchers found that carbon dioxide emissions from soils were reduced by about 20 percent over 100 years, as compared with simulations that did not take black carbon's long shelf life into account.

The findings are significant because soils are by far the world's largest source of carbon dioxide, producing 10 times more carbon dioxide each year than all the carbon dioxide emissions from human activities combined.

Small changes in how carbon emissions from soils are estimated, therefore, can have a large impact.

The study quantified the amount of black carbon in 452 Australian soils across two savannas. Black carbon content varied widely, between zero and more than 80 percent, in soils across Australia.

"We know from measurements that climate change today is worse than people have predicted," said Lehmann. "But this particular aspect, black carbon's stability in soil, if incorporated in climate models, would actually decrease climate predictions," he added.

Source: ANI
SPH
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Advertisement
News Category
What's New on Medindia
International Day of Persons with Disabilities 2021 - Fighting for Rights in the Post-COVID Era
Effect of Blood Group Type on COVID-19 Risk and Severity
Woman with Rare Spinal Cord Defect from Birth Sues Doctor
View all

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Health Effects of Global Warming Global Warming 

Recommended Reading
Critical Component of Climate Change Could be Water Vapor
Using recent NASA satellite data, researchers have estimated more precisely than ever the ......
Soil may Release Less CO2 Than Expected Due to Global Warming
A new study of Australian soils has indicated that as the climate warns, soils may not release as .....
Study Claims Recent Climate Change More Significant Than Ever
A new study has determined that while Earth experienced numerous changes in climate over the past .....
Health Effects of Global Warming
Greenhouse effect causes excessive heat to build up in the earth’s atmosphere causing global warming...

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2021

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use