Navigation Links
Growing nitrous oxide levels explained
Date:4/4/2012

Australian, Korean and US scientists have generated a 65-year record of Southern Hemisphere nitrous oxide measurements establishing a new benchmark against which to compare changes in the long-lived greenhouse gas that is also a major ozone-depleting substance.Published this week in the journal Nature Geoscience, the record is drawn from atmospheric sampling at the Cape Grim Baseline Air Pollution Station, Tasmania, and air extracted from the Antarctic ice sheet

Its significance, says co-author CSIRO's Dr David Etheridge, will be its contribution to the development of emissions protocols as countries step up their monitoring of gases contributing to global warming and ozone depletion.

Nitrous oxide, N2O, is produced naturally by microbial activity in soils and the oceans as well as by agriculture. With a lifetime in the atmosphere of around 120 years, it is eventually broken down by oxidation in the stratosphere.

Scientists have measured a 20% increase in atmospheric nitrous oxide since 1750.

Dr Etheridge said that through analysis of isotopes, which are different forms of the nitrogen and oxygen comprising nitrous oxide, researchers identified that the increase of nitrous oxide was largely from agricultural sources.

"Through these measurements and a close analysis of the record we can also see seasonal cycles in N2O's isotopic composition, as well as large year-to-year variations and long-term trends," he said

He said the unique record of seasonal cycles allows scientists to trace the production and loss of nitrous oxide, from its origins in the ocean and soils to its movement through the stratosphere where it contributes to breaking down ozone.

"Until now the balance between the stratospheric sink and the oceanic source of nitrous oxide has been a key uncertainty in understanding nitrous oxide variations at the Earth's surface.

"This new evidence of the budget nitrous oxide allows us to better predict its future changes and therefore its impacts on climate and stratospheric ozone depletion - for different scenarios of fertiliser use in support of rising populations and increased production for bio-energy," he said.

Dr Etheridge said the record demonstrates the value of Australia's investment, through CSIRO and the Bureau of Meteorology, in a world-class atmospheric monitoring station since the 1970s, with its underlying vision of establishing an air archive which can be measured as new technologies are developed.

Adding to this is the Australian Antarctic Division's glaciology program that accesses a natural archive of the past atmosphere, at its primary drilling site Law Dome.

Dr Etheridge said that better estimates of the magnitudes and geographic distribution of N2O sources and how they change over time help formulate sound emissions policies.

Led by University of California-Berkeley's Dr Sunyoung Park, Australian co-authors included CSIRO scientists at the Centre for Australian Weather and Climate Research, Drs Paul Fraser, Paul Krummel, Ray Langenfelds, Paul Steele, Cathy Trudinger, and Dr Tas van Ommen, from the Australian Antarctic Division.

The Cape Grim Air Pollution Station's scientific research is jointly managed by the Bureau of Meteorology and CSIRO Marine and Atmospheric Research. The Australian Antarctic Division and the Australian Antarctic Science Program supported access and drilling at Law Dome.


'/>"/>

Contact: Craig Macaulay
Craig.Macaulay@csiro.au
61-362-325-219
CSIRO Australia
Source:Eurekalert

Related biology news :

1. VIB-BGI Genomics Meeting highlights growing impact of large-scale genomics in life sciences
2. After 25 years, sustainability is a growing science thats here to stay
3. Environmental troubles growing in Mid-East Gulf region due to rapid coastal development
4. Trees on tundras border are growing faster in a hotter climate
5. Growing without cell division
6. Acinetobacter baumannii found growing in nearly half of infected patient rooms
7. Growing something out of nothing
8. New method of growing high-quality graphene promising for next-gen technology
9. Genencor promotes biobased economy to address challenges of fast-growing world population
10. Rapid evolution within single crop-growing season increases insect pest numbers
11. Regrowing blood vessels with a potent molecule
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/23/2016)... 2016 Einzigartige ... und Stimmerkennung mit Passwörtern     ... MESG ), ein führender Anbieter digitaler Kommunikationsdienste, ... SpeechPro zusammenarbeitet, um erstmals dessen Biometrietechnologie einzusetzen. ... Möglichkeit angeboten, im Rahmen mobiler Apps neben ...
(Date:3/22/2016)... , PROVO and ... -- Newborn Screening Ontario (NSO), which operates the highest ... for molecular testing, and Tute Genomics and UNIConnect, leaders ... technology respectively, today announced the launch of a project ... sequencing (NGS) testing panel. NSO has ...
(Date:3/18/2016)... -- --> --> Competitive ... Unmanned Vehicles, Physical infrastructure and Perimeter Surveillance & Detection Systems ... security market and the continuing migration crisis in the ... has led visiongain to publish this unique report, which ... defence & security companies in the border security market ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... 2016  The Prostate Cancer Foundation (PCF) is pleased to announce ... cures for prostate cancer. Members of the Class of 2016 were selected from ... Read More About the Class of 2016 PCF Young Investigators ... ... ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the sample tracking software ... State Crime Laboratory, has joined STACS DNA as a Field Application Specialist. , ... Tremblay, President and COO of STACS DNA. “In further expanding our capacity as a ...
(Date:6/23/2016)... 2016 Andrew D ... http://doi.org/10.17925/OHR.2016.12.01.22 Published recently in ... from touchONCOLOGY, Andrew D Zelenetz , discusses ... care is placing an increasing burden on healthcare ... therapies. With the patents on many biologics expiring, ...
(Date:6/23/2016)... ... June 23, 2016 , ... Velocity Products, a division ... tuned and optimized exclusively for Okuma CNC machining centers at The International Manufacturing ... collaboration among several companies with expertise in toolholding, cutting tools, machining dynamics and ...
Breaking Biology Technology: