HOME >> BIOLOGY >> NEWS
500,000 years of climate history stored year by year

The bottom of Turkeys Lake Van is covered by a layer of mud several hundreds of metres deep. For climatologists this unprepossessing slime is worth its weight in gold: summer by summer pollen has been deposited from times long past. From it they can detect right down to a specific year what climatic conditions prevailed at the time of the Neanderthals, for example. These archives may go back as much as half a million years. An international team of researchers headed by the University of Bonn now wants to tap this treasure. Preliminary investigations have been a complete success: the researchers were able to prove that the climate has occasionally changed quite suddenly sometimes within ten or twenty years.

Every summer an inch-thick layer of lime calcium carbonate trickles down to find its final resting place at the bottom of Lake Van. Day by day during this period millions and millions of pollen grains float down to the depths. Together with lime they form a light-coloured layer of sediment, what is known as the summer sediment.

In winter the continual snowdrift beneath the surface changes its colour: now clay is the main ingredient in the sediment, which is deposited as a dark brown winter sediment on top of the pollen-lime mix. At a depth of 400 metres no storm or waves disturb this process. These annual rings in the sediment can be traced back for hundreds of thousands of years. In some places the layer of sediment is up to 400 metres thick, the Bonn palaeontologist Professor Thomas Litt explains. There are about 20,000 annual strata to every 10 metres, he calculates. We presume that the bottom of Lake Van stores the climate history of the last 800,000 years an incomparable treasure house of data which we want to tap for at least the last 500,000 years.

250 metres of sediment = 500,000 years worth of climate archives

Professor Litt is the spokesman of an international consortium of scientists that wants to
'"/>

Contact: Thomas Litt
t.litt@uni-bonn.de
49-228-732-736
University of Bonn
14-Mar-2007


Page: 1 2 3

Related biology news :

1. Maynard Olson receives $500,000 Gruber Genetics Prize
2. Stevens and Connecticut Innovations agree to investment of $500,000 in SPOC Inc.
3. Bioengineer wins $500,000 engineering prize
4. Caltechs Emmanuel Candes to receive $500,000 Waterman Award
5. Laser technologist to receive $500,000 MacArthur grant for genius in innovative laser applications
6. Biochemist to receive $500,000 MacArthur grant for genius in drug research
7. Biologist to receive $500,000 MacArthur grant for genius in innovative gene, molecule studies
8. First new multiple sclerosis gene found in 30 years
9. Wolves of Alaska became extinct 12,000 years ago, scientists report
10. Journal of Nuclear Medicines impact grows, remains consistently high over past 5 years
11. An elegant idea proves its worth 25 years later

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/5/2020)... ... , ... Regenative Labs has received approval from the Centers for Medicare & ... first Wharton’s jelly allografts to be assigned a Q code and be approved for ... Wharton’s jelly allograft product to be recognized as a 361 HCT/P by CMS regulated ...
(Date:7/18/2020)... ... July 16, 2020 , ... A study has been published ... Neoasis™ active noise control device to attenuate typical noises in a simulated neonatal ... the alarm sounds from patient monitors, ventilators and other bedside devices that would ...
(Date:7/2/2020)... ... July 01, 2020 , ... AltruBio Inc. http://www.altrubio.com ... a biologic for the treatment of steroid-refractory acute graft-versus-host disease (SR-aGVHD), at European ... J Martin of the Fred Hutchinson Cancer Research Center, this single-arm, open-label Phase ...
Breaking Biology News(10 mins):
(Date:8/12/2020)... FARMS, Mich. (PRWEB) , ... August 12, 2020 ... ... Consulting Group, Inc. (EMMA International), a global leader in FDA compliance consulting ... of the nation’s fastest-growing private companies. The list represents a unique look at ...
(Date:8/3/2020)... (PRWEB) , ... August 03, 2020 , ... ... collection, today announced Jim Corrigan, President and CEO has been named one of ... broad cross-section of industry sectors, PharmaVoice 100 honorees are selected based on how ...
(Date:7/31/2020)... ... July 29, 2020 , ... R3 Stem Cell International is ... $3950. With 50 million stem cells total, patients may choose which extremities they would ... for arthritic joints (BMC Musculoskelet Disord. 2016). At R3 International, umbilical cord tissue is ...
(Date:7/31/2020)... ... July 29, 2020 , ... ... transmitter systems that can be configured to drive Klystrons, TWTs, IOTs, and magnetrons. ... drive one or two switches in a push-pull configuration; yielding fast fall time ...
Breaking Biology Technology:
Cached News: