Navigation Links
The water cycle amplifies abrupt climate change
Date:1/19/2014

The role of the hydrological cycle during abrupt temperature changes is of prime importance for the actual impact of climate change on the continents. In a new study published in Nature Geoscience online (January 19, 2014) scientists from the University of Potsdam, Germany and the GFZ German Research Centre for Geosciences show that during the abrupt cooling at the onset of the so-called Younger Dryas period 12680 years ago changes in the water cycle were the main drivers of widespread environmental change in western Europe. The team of scientists analyzed organic remains extracted from Meerfelder maar lake sediments from the Eifel region, western Germany, to reconstruct changes in precipitation patterns in unprecedented detail. They were able to show that the intrusion of dry polar air into western Europe lead to the collapse of local ecosystems and resulted in the observed widespread environmental changes at that time.

Organic remains of plants from lake sediments as molecular rain gauges

The exact sequence of events during abrupt climate changes occurring over only a few years is one of the great unknowns in paleoclimate research. The new results presented here were obtained by using a novel method, where molecular organic remains derived from plant fossils were extracted from precisely dated annually laminated lake sediments. The ratio of the heavy Deuterium to the light Hydrogen isotopes in these biomarkers can be used to reconstruct changes in precipitation regime and moisture sources with unprecedented detail.

The Younger Dryas period was the last major cold period at the end of the last glaciation with a duration of about 1100 years, when an abrupt change in the pathway of westerly wind systems over Europe lead to massive environmental change within a few years, as GFZ scientists showed in an earlier study. Dirk Sachse, the head of the workgroup at the Institute of Earth and Environmental Sciences of the Potsdam University explains: "In our new study we can show for the first time that this change in the pathway of westerly wind systems brought dry polar air into western Europe and this was the ultimate cause for the widespread disappearance of forests in the area."

Changing westerly wind pathways bring dry polar air into western Europe

With these new results, the group also supports the hypothesis that this change in atmospheric circulation patterns over western Europe took place 170 years after the onset of cooling, as observed in the Greenland Icecores. The authors attribute this delay to the subsequent southward expansion of sea ice in the North Atlantic following the onset of cooling. This lead to a southward shift of the polar front channeling dry polar air into western Europe. "Our results also show that abrupt climate and environmental change may not be coeval on large regional scales, but can take place with substantial regional and temporal delays" explains Prof. Achim Brauer from the GFZ German Research Centre for the Geosciences.

The results of this study, which was funded by the German Research Foundation (DFG) through its Emmy-Noether Programme and the Helmholtz Climate Initiative REKLIM, do not only show unequivocally that temperature changes can have regionally different impacts, but also that the water cycle acts as amplifier of change with potentially severe effects on continental ecosystems. As such, the regional impacts of future climate changes can be largely driven by hydrological changes, not only in the monsoonal areas of the world, but also in temperate areas, such as western Europe. The results of this study contribute to the development of higher spatially resolved regional climate models, which will allow for a better prediction of the regional impacts of future climate change.


'/>"/>

Contact: F.Ossing
ossing@gfz-potsdam.de
49-331-288-1040
GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre
Source:Eurekalert

Related biology news :

1. Waterfowl poisoning halved by lead shot prohibition
2. Coral reefs in Palau surprisingly resistant to naturally acidified waters
3. An improved, cost-effective catalyst for water-splitting devices
4. MBL scientists to study coastal waterbird habitats through funding for Obamas Climate Action Plan
5. To curb Chinas haze and air pollution, use water
6. Deepwater Horizon NRDA study shows possible oil impact on dolphins
7. American Chemical Society podcast: Detecting radioactive material in nuclear waste water
8. SOFS take to water
9. Ultrafast heating of water -- This pot boils faster than you can watch it
10. Where water is limited, researchers determine how much water is enough
11. New study highlights key role soil structure plays in water uptake by crops
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/6/2017)... , Feb. 6, 2017 According ... security are driving border authorities to continue to ... reports there are 2143 Automated Border Control (ABC) ... currently deployed at more than 163 ports of ... 2013 to 2016 achieving a combined CAGR of ...
(Date:2/2/2017)...  Central to its deep commitment to honor ... Japan Prize Foundation today announced the laureates of ... envelope in their respective fields of Life Sciences ... being recognized with the 2017 Japan Prize for ... to the advancement of science and technology, but ...
(Date:1/26/2017)... , Jan. 26, 2017  Acuity Market Intelligence ... Biometrics and Digital Identity".  Acuity characterizes 2017 as ... when increased adoption reflects a new understanding of ... "Biometrics and digital identity are often perceived ... Maxine Most , Principal of Acuity Market intelligence. ...
Breaking Biology News(10 mins):
(Date:2/23/2017)... ... February 23, 2017 , ... Today, researchers ... CRP, adiponectin, uric acid, and/or other biomarkers or SNPs of interest) using one, ... Salimetrics’ SalivaLab , the relationship between insulin and other relevant biomarkers can be ...
(Date:2/23/2017)... , Feb. 23, 2017 Aviva ... tools, announced the acquisition of GenWay Biotech Incorporated, ... comprehensive service and product offering for both the ... will facilitate growth and enhance capabilities for both ... and ELISA assays will nicely complement ASB,s objective ...
(Date:2/22/2017)... Feb. 22, 2017  Aratana Therapeutics, Inc. (NASDAQ: PETX), a ... of innovative biopharmaceutical products for companion animals, will host a ... a.m. ET to discuss financial results from the fourth quarter ... Interested participants and investors may access the audio webcast ... ...
(Date:2/22/2017)... DIEGO , Feb. 22, 2017  PrimeVax Immuno-Oncology, ... will be presenting at the Annual Biocom Global Life ... March 2, at 11:15 AM, at the Torrey Pines ... thankful to the organizers at Biocom who have chosen ... international symposium of biotechnology companies, investors, and clinical researchers," ...
Breaking Biology Technology: