Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Stratospheric ozone chemistry plays an important role for atmospheric airflow patterns

10.03.2008
Still too much uncertainty in today's climate models

Interactions between the stratospheric ozone chemistry and atmospheric air flow lead to significant changes of airflow patterns from the ground up to the stratosphere.

This is the result of climate simulations, which have just been published in the journal "Geophysical Research Letters" (Brand et al, Geophys. Res. Lett.). Scientists at the Research Unit Potsdam of the Alfred Wegener Institute for Polar and Marine Research, which is a member of the Helmholtz Association, have investigated a fundamental process for climate interactions in the Arctic. So far it is not known what causes natural variations of atmospheric air flow patterns which have been playing an important role for climate changes in the last decades. This basic knowledge is necessary to improve climate models that still hold much uncertainty.

Atmospheric airflows follow preferred patterns. The most important pattern for the northern hemisphere is the Arctic Oscillation. It's a spacious oscillation of the atmosphere that is characterised by opposing anomalies in air pressure in the central Arctic region and in parts of the mid- and subtropical latitudes. This oscillation of the atmosphere lasts for decades and is more or less pronounced. In the positive phase, which has been predominant since 1970, the polar vortex during winter times is stable and the exchange of air masses between the mid- and higher latitudes is limited. In midlatitudes strong westerly winds bring warm air from the Atlantic Ocean to North and Central Europe and Siberia during the winter season. In the negative phase of the Arctic Oscillation cold polar air can penetrate further south and leads to harsh winter seasons in Europe.

So far feedbacks between chemical processes in the stratosphere and the circulation in the troposphere and stratosphere (height between 0 and 10 kilometres or 10 and about 50 kilometres) are not included in complex global climate models linking atmosphere and ocean. For the first time, scientists from the Alfred Wegener Institute have included a module of stratospheric ozone chemistry into a coupled global climate model. The scientists show that ozone chemistry significantly influences the Artic Oscillation by comparing simulations of the standard model with results from the model extended by the new ozone chemistry module. Changes of atmospheric air flows and temperature distribution lead to an increase of the negative phase of the Artic Oscillation during the winter seasons.

"Our research is an important contribution to reduce the uncertainty in the simulation of today's climate. Today's climate models carry, contrary to many claims, still a high level of uncertainty. Only by understanding the basic processes in the Arctic, can we quantify these deviations and eliminate them," said Sascha Brand of the Alfred Wegener Institute, main author of the published study. The results indicate that if interactions between atmospheric air flow and stratospheric ozone chemistry are being taken into account, they will also have an influence on the stability of the polar vortex in the simulation of future climate developments and should therefore be included in climate models. In a follow-up project, the new model will be used for the calculation of future climate developments.

The Alfred Wegener Institute performs research in the Arctic, in the Antarctic and in the oceans at mid- and high latitudes. It coordinates the polar research in Germany and provides important infrastructure like the research icebreaker "Polarstern" and stations in the Arctic and Antarctica for the use of the international scientific community. The Alfred Wegener Institute is one among the fifteen research centres of the Helmholtz Association, the biggest scientific organisation in Germany.

Margarete Pauls | idw
Further information:
http://www.awi.de/

More articles from Earth Sciences:

nachricht Six-decade-old space mystery solved with shoebox-sized satellite called a CubeSat
15.12.2017 | National Science Foundation

nachricht NSF-funded researchers find that ice sheet is dynamic and has repeatedly grown and shrunk
15.12.2017 | National Science Foundation

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>