Navigation Links
'Chemical equator' discovery will aid pollution mapping
Date:9/23/2008

Scientists at the University of York have discovered a 'Chemical Equator' that divides the polluted air of the Northern Hemisphere from the largely uncontaminated atmosphere of the Southern Hemisphere.

Researchers from the University's Department of Chemistry found evidence for an atmospheric chemical equator around 50 km wide in cloudless skies in the Western Pacific. Their findings show for the first time that the chemical and meteorological boundaries between the two air masses are not necessarily the same.

The discovery will provide important clues to help scientists to model simulations of the movement of pollutants in the atmosphere more accurately, and to assess the impact of pollution on climate. The study is part of the ACTIVE project (Aerosol and Chemical Transport in Tropical Convection) funded by the Natural Environment Research Council.

Previously, scientists believed that the Intertropical Convergence Zone (ITCZ) formed the boundary between the polluted air of the Northern Hemisphere and the cleaner air of the Southern Hemisphere. The ITCZ is a cloudy region circling the globe where the trade winds from each hemisphere meet. It is characterised by rapid vertical uplift and heavy rainfall, and acts as a meteorological barrier to pollutant transport between the hemispheres.

But the new research, to be published in the Journal of Geophysical Research - Atmospheres, found huge differences in air quality on either side of the chemical equator, which was 50 km wide and well to the north of the ITCZ. The study revealed that carbon monoxide, a tracer of combustion, increased from 40 parts per billion to the south, to 160 parts per billion in the north. The difference in pollutant levels was increased by extensive forest fires to the north of the boundary and very clean air south of the chemical equator being pulled north from the Southern Indian Ocean by a land based cyclone in northern Australia.

The scientists discovered evidence of the chemical equator using sensors on a specially equipped aeroplane during a series of flights north of Darwin. At the time, the ITCZ was situated well to the south over central Australia.

Dr Jacqueline Hamilton, of the Department of Chemistry at York, said: "The shallow waters of the Western Pacific, known as the Tropical Warm Pool, have some of highest sea surface temperatures in the world, which result in the region's weather being dominated by storm systems. The position of the chemical equator was to the south of this stormy region during the ACTIVE campaign.

"This means that these powerful storms may act as pumps, lifting highly polluted air from the surface to high in the atmosphere where pollutants will remain longer and may have a global influence. To improve global simulations of pollutant transport, it is vital to know when the chemical and meteorological boundary are in different locations."


'/>"/>

Contact: David Garner
dcg501@york.ac.uk
44-019-044-32153
University of York
Source:Eurekalert

Related biology news :

1. Green tea boosts production of detox enzymes, rendering cancerous chemicals harmless
2. American Chemical Societys Weekly PressPac -- Aug. 8, 2007
3. Thermochemical process converts poultry litter into bio-oil
4. New chemically-sensitive MRI scan may bypass some invasive diagnostic tests in next decade
5. Natural chemical found in broccoli helps combat skin blistering disease
6. American Chemical Societys Weekly PressPac -- Aug. 15, 2007
7. American Chemical Societys Weekly Press Pac
8. Amber specimen captures ancient chemical battle
9. American Chemical Societys Weekly Presspac -- Aug. 29, 2007
10. American Chemical Society calls green chemistry bill a smart step
11. Institution of Chemical Engineers chooses Elsevier as publishing partner
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/15/2016)... York , June 15, 2016 ... new market report titled "Gesture Recognition Market by Application ... Forecast, 2016 - 2024". According to the report, the  ... 11.60 billion in 2015 and is estimated to ... USD 48.56 billion by 2024.  Increasing ...
(Date:6/9/2016)... Paris Police Prefecture and ... ensure the safety of people and operations in several locations ... Teleste, an international technology group specialised in broadband ... its video security solution will be utilised by ... across the country. The system roll-out is scheduled for the ...
(Date:6/3/2016)... LONDON , June 3, 2016 /PRNewswire/ ... Transport Management) von Nepal ... ,Angebot und Lieferung hochsicherer geprägter Kennzeichen, einschließlich ... weltweit führend in der Produktion und Implementierung ... an der Ausschreibung im Januar teilgenommen, aber ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... 2016  Blueprint Bio, a company dedicated to identifying, ... community, has closed its Series A funding round, according ... "We have received a commitment from Forentis Fund ... to meet our current goals," stated Matthew Nunez ... to complete validation on the current projects in our ...
(Date:6/23/2016)... On Wednesday, June 22, 2016, the ... the Dow Jones Industrial Average edged 0.27% lower to finish ... 0.17%. Stock-Callers.com has initiated coverage on the following equities: Infinity ... NKTR ), Aralez Pharmaceuticals Inc. (NASDAQ: ... ). Learn more about these stocks by accessing their free ...
(Date:6/23/2016)... Pleasant Prairie, WI (PRWEB) , ... June 23, ... ... sciences consultancy focused on quality, regulatory and technical consulting, provides a free ... webinar is presented on July 13, 2016 at 12pm CT at no charge. ...
(Date:6/23/2016)... , June 22, 2016  Amgen (NASDAQ: ... of the QB3@953 life sciences incubator to ... health. The shared laboratory space at QB3@953 was created ... a key obstacle for many early stage organizations - ... of the sponsorship, Amgen launched two "Amgen Golden Ticket" ...
Breaking Biology Technology: