Navigation Links
Rapid climate changes, but with a 120 year time lag
Date:12/4/2013

Regional climate changes can be very rapid. A German-British team of geoscientists now reports that such a rapid climate change occurred in different regions with a time difference of 120 years. Investigation in the west German Eifel region and in southern Norway demonstrated that at the end of the last glaciation about 12,240 years before present climate became warmer, first recognised in the Eifel region and 120 years later in southern Norway. Nonetheless, the warming was equally rapid in both regions.

The team around Christine Lane (Oxford University) and Achim Brauer from the GFZ German Research Centre for Geosciences reports in the latest volume of "Geology" (vol 41, no 12, p. 1251) that within the younger Dryas, the last about 1100-year long cold phase at the end of the last ice age, a rapid warming first was measured in the Eifel region. Sediment cores from the Meerfelder Maar lake depict a typical deposition pattern, which was also found in the sediments of Lake Krakenes in southern Norway, but with a time lag of 120 years.

But how did the researcher revealed such a accurate time marking? "12 140 years ago a major eruption of the Katla volcano occurred on Iceland" explains Achim Brauer. "The volcanic ash was distributed by strong winds over large parts of northern and central Europe and we can find them with new technologies as tine ash particles in the sediment deposits of lakes. Through counting of annual bands in these sediments we could precisely determine the age of this volcanic ash." Therefore, this ash material reflects a distinct time marker in the sediments of the lakes in the Eifel and in Norway.

Furthermore, lake sediments are very accurate climate archives, especially when they contain seasonal bands similar like tree rings. "It is a diligent piece of work to count and analyse thousands of these thin layers under the microscope to reconstruct climate year-by-year far back in time", illustrates Brauer.

The ash of the Katla volcanic eruption thus was deposited at the same time in the Eifel and in Norway. The sediments of the Eifel maar lake depict the rapid warming 100 years before the volcanic ash, while it is seen in the southern Norwegian lake sediment 20 years after the volcanic eruption. The same warming, but with a 120 difference in timing between the about 1200 km distant locations? Achim Brauer:

"We can explain this difference with the shift of hemispheric wind systems. Climate changed in both regions very rapid, but the polar front, that is the atmospheric boundary layer between cold polar air and the warmer air of the mid-latitudes, required more than 100 years to retreat from its glacial position at about the location of the Eifel at 50 N to its southern Norwegian position at 62 N."

Hence, the study provides evidence for a rapid change that slowly moved northwards. The result of this study has some implications on the understanding of both past and future climate change. The assumption of an everywhere and always synchronously changing climate must be questioned and climate models have to better consider such regional aspects.


'/>"/>

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

Related biology news :

1. Rapid method of assembling new gene-editing tool could revolutionize genetic research
2. Researchers develop rapid test strips for bacterial contamination in swimming water
3. Virus barcodes offer rapid detection of mutated strains
4. Speeding up drug discovery with rapid 3-D mapping of proteins
5. Key part of plants rapid response system revealed
6. Genetic link to rapid weight gain from antipsychotics discovered
7. UCLA research makes possible rapid assessment of plant drought tolerance
8. Triage for plants: NYBG scientists develop and test rapid species conservation assessment technique
9. Research finds heart remodeling rapidly follows cardiac injury
10. Rapid response in cases of smoke poisoning
11. Researchers develop rapid method to measure carbon footprints
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2017)... Florida , April 17, 2017 NXT-ID, ... technology company, announces the filing of its 2016 Annual Report on ... and Exchange Commission. ... on Form 10-K is available in the Investor Relations section of ... as on the SEC,s website at http://www.sec.gov . ...
(Date:4/11/2017)... , Apr. 11, 2017 Research and ... Market 2017-2021" report to their offering. ... The global eye tracking market to grow at a ... report, Global Eye Tracking Market 2017-2021, has been prepared based on ... covers the market landscape and its growth prospects over the coming ...
(Date:4/5/2017)...  The Allen Institute for Cell Science today announces ... portal and dynamic digital window into the human cell. ... application of deep learning to create predictive models of ... a growing suite of powerful tools. The Allen Cell ... publicly available resources created and shared by the Allen ...
Breaking Biology News(10 mins):
(Date:6/22/2017)... ... June 22, 2017 , ... ... specialists DST Diagnostische Systeme & Technologien GmbH, thereby expanding its product portfolio to ... from hay fever, urticaria, asthma, atopic eczema or a food allergy. Allergies are ...
(Date:6/22/2017)... ... June 22, 2017 , ... The first human cell line HeLa, established ... first data on cross-contamination of human cell lines with HeLa cells were published. Until ... cell culture labs and is associated with dramatic consequences for research. , In ...
(Date:6/20/2017)... (PRWEB) , ... June 20, 2017 , ... Biologist Dawn ... men. While researching her latest book, Men Chase, Women Choose: The Neuroscience of Meeting, ... love has a physiological effect on men. ”The logical next step, in my estimation, ...
(Date:6/20/2017)... NJ (PRWEB) , ... June 20, 2017 , ... Do ... makes the transition from being a trusted supplier in the weighing industry, to extending ... cell extractions, ELISA essays, enzyme reactions, immunoassays, hybridizations and more, allowing for its ...
Breaking Biology Technology: