Tracking down abrupt climate changes

Aug 01, 2008

In an article in the scientific magazine Nature Geosciences, the geoscientists Achim Brauer, Peter Dulski and Jörg Negendank, (emeritus Professor) from the GFZ German Research Centre for Geosciences, Gerald Haug from the DFG-Leibniz Center for Surface Processes and Climate Studies at the University of Potsdam and the ETH in Zurich, and Daniel Sigman from the Princeton University prove, for the first time, an extremely fast climate change in Western Europe. This took place long before man-made changes in the atmosphere, and is causatively associated with a sudden change in the wind systems.

The proof of an extreme cooling within a short number of years 12 700 years ago was attained in sediments of the volcanic lake "Meerfelder Maar" in the Eifel, Germany. The seasonally layered deposits allow to precisely determine the rate of climate change.

With a novel combination of microscopic research studies and modern geochemical scanner procedures the scientists were able to successfully reconstruct the climatic conditions even for individual seasons. And so it was particularly the changes in the wind force and direction during the winter half-year, which caused the climate to topple over into a completely different mode within one year after a short instable phase of a few decades.

Up to now one assumed that it was the attenuation of the Golf Stream alone that was responsible for the strong cooling in Western Europe.

The examined lake deposits show however that the atmospheric circulation, probably in connection with the spreading of sea-ice, probably played a very important role. At the same time, these new results also show that the climate system is long not understood, and that especially the mechanisms of short-term change and the time of occurrence still hold many puzzles. Micro-layered lake deposits represent particularly suitable geological archives, with which scientists want to track down climate change.

Scientists from the Helmholtz Centre Potsdam – German Research Centre for Geosciences (GFZ) and other institutions are in search of such archives worldwide, so as to also, in the future, obtain area-wide information on the dynamics of climate and possible regional variations.

Citation: "An abrupt wind shift in Western Europe at the onset of the Younger Dryas cold period", Achim BRAUER, Gerald H. HAUG, Peter DULSKI, Daniel M. SIGMAN, Jörg F.W. NEGENDANK, Nature Geoscience 8, 520 – 523

Source: Helmholtz Association of German Research Centres

Explore further: Scientists investigate link between skyrocketing sea slug populations and warming seas

add to favorites email to friend print save as pdf

Related Stories

Storm chasers take on supercell thunderstorms in Bangladesh

42 minutes ago

This past April, Scott Olson touched down in Bangladesh to become the country's first known storm chaser. On the other side of the world, back in Oklahoma, Tim Vasquez and a team of meteorologists worked tirelessly to put ...

A robot to help improve wine production

52 minutes ago

A European research consortium comprising Spanish, French, Italian and German universities and companies is working on the development of an unmanned robot, equipped with non-invasive advanced sensors and ...

Recommended for you

Global warming won't mean more stormy weather

13 hours ago

A study led by atmospheric physicists at the University of Toronto finds that global warming will not lead to an overall increasingly stormy atmosphere, a topic debated by scientists for decades. Instead, ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

mikiwud
2.3 / 5 (3) Aug 01, 2008
The changes were probably not global,but over much of the northern hemisphere as to change average global temperatures.It does show that CO2 is not the only cause (or not) of changes as a lot of scientists say if allowed to be heard by the public.
Can we protect these brave scientists from the Gorestapo?

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.