Featured Research

from universities, journals, and other organizations

Coastal waters produce halogenated organic molecules that exacerbate stratospheric ozone depletion

Date:
February 1, 2012
Source:
Heidelberg University
Summary:
Coastal waters of the tropical Western Pacific produce natural halogenated organic molecules involving chlorine, bromine and iodine atoms that may damage the stratospheric ozone layer. This is the conclusion drawn from the initial findings of a field measurement campaign conducted in the South China Sea.

Coastal waters of the tropical Western Pacific produce natural halogenated organic molecules involving chlorine, bromine and iodine atoms that may damage the stratospheric ozone layer. This is the conclusion drawn from the initial findings of a field measurement campaign conducted in the South China Sea in the framework of the international SHIVA project. In November and December 2011, the scientists involved in this interdisciplinary project, which is coordinated by physicists from the Institute of Environmental Physics at Heidelberg University, investigated the oceanic sources and atmospheric transport pathways of these trace gases in the waters and air of Malaysia, Brunei and the Philippines.

The halogens chlorine, bromine and iodine are known as ozone-depleting substances. Micro-organisms such as macro-algae and phytoplankton form natural halogenated organic molecules, which are released into the air, where they eventually find their way into the stratosphere. The SHIVA project is testing conjectures based on earlier findings by scientists from Heidelberg University's Institute of Environmental Physics that the ozone layer may not only be harmed by industrial "ozone killers" like chlorofluorocarbons (CFC), but also by these natural halogenated organic molecules. "Our measurements off the coast of Borneo, in the South China Sea and in the Sulu Sea indicate that the biologically productive coastal waters are particularly abundant sources of these trace gases," says overall coordinator Prof. Dr. Klaus Pfeilsticker of Heidelberg University. Involved in the field measurements were the German research ship "Sonne" and various smaller Malaysian vessels. "In addition, our British and Malaysian colleagues did laboratory analyses which indicate that rhodophyta, or red algae, are one of the prime producers of these halogenated organic molecules, due to a stress reaction triggered by oxygen," Prof. Pfeilsticker adds.

The German Aerospace Center's (Deutsches Zentrum für Luft- und Raumfahrt, DLR) research plane "Falcon" based in Miri (Borneo) was used to investigate the atmospheric transport pathways of the halogenated organic molecules and their decay products more closely. In the tropics, atmospheric transport of the targeted species to the mid troposphere is fairly rapid due to the shallow atmospheric boundary layer. In addition, in the rainy season convective systems like thunderstorms lift the air masses into the upper troposphere in a matter of hours. "The results from our measurements and models indicate that for the transport of ozone relevant and other trace gases into the upper tropical troposphere, the vertical transport due to intermittent convective systems is the most important factor," says Prof. Pfeilsticker. "From there these gases are transported to the lower stratosphere by radiative heating in the tropical tropopause layer."

Next, the scientists will evaluate and interpret the new data with the help of large-scale chemical, transport and global-climate models. "Our aim is to predict the future development of the ozone layer under the influence of anthropogenic climate change in the tropical oceans, atmospheric circulation and photochemistry," says Prof. Pfeilsticker. In the coming years, the transport pathways of the halogenated organic molecules in the tropical tropopause region are to be investigated with high-flying planes like the NASA's"Global Hawk."


Story Source:

The above story is based on materials provided by Heidelberg University. Note: Materials may be edited for content and length.


Cite This Page:

Heidelberg University. "Coastal waters produce halogenated organic molecules that exacerbate stratospheric ozone depletion." ScienceDaily. ScienceDaily, 1 February 2012. <www.sciencedaily.com/releases/2012/02/120201093105.htm>.
Heidelberg University. (2012, February 1). Coastal waters produce halogenated organic molecules that exacerbate stratospheric ozone depletion. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2012/02/120201093105.htm
Heidelberg University. "Coastal waters produce halogenated organic molecules that exacerbate stratospheric ozone depletion." ScienceDaily. www.sciencedaily.com/releases/2012/02/120201093105.htm (accessed September 1, 2014).

Share This




More Earth & Climate News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Lightning Hurts 3 on NYC Beach

Lightning Hurts 3 on NYC Beach

AP (Sep. 1, 2014) — A lightning strike injured three people on a New York City beach on Sunday. The storms also delayed flights and interrupted play at the US Open tennis tournament. (Sept. 1) Video provided by AP
Powered by NewsLook.com
Thailand Totters Towards Waste Crisis

Thailand Totters Towards Waste Crisis

AFP (Sep. 1, 2014) — Fears are mounting in Bangkok that poor planning and lax law enforcement are tipping Thailand towards a waste crisis. Duration: 01:21 Video provided by AFP
Powered by NewsLook.com
Washington Wildlife Center Goes Nuts Over Baby Squirrels

Washington Wildlife Center Goes Nuts Over Baby Squirrels

Reuters - US Online Video (Aug. 30, 2014) — An animal rescue in Washington state receives an influx of orphaned squirrels, keeping workers busy as they nurse them back to health. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Raw: Volcano Erupts on Papua New Guinea

Raw: Volcano Erupts on Papua New Guinea

AP (Aug. 29, 2014) — Several communities were evacuated and some international flights were diverted on Friday after one of the most active volcanos in the region erupts. (Aug. 29) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins