HOME >> BIOLOGY >> NEWS
Lake Titicaca study sheds new light on global climate change

Tropical South America has endured alternating periods of heavy rainfall and severe drought during the last 25,000 years, according a new study in the journal Science.

The report - based on geological evidence from one of South America`s largest lakes - demonstrates how nature can produce sudden, unexpected climate changes that affect the entire planet.

The study, which appears in the Jan. 26 issue of Science, uses sediment samples taken from the bottom of Lake Titicaca - the world`s highest lake navigable to large vessels.

Straddling the border between Bolivia and Peru, Titicaca is 120 miles long, 50 miles wide and has average depth of 500 feet. The lake is located more than 2 miles above sea level on the Altiplano, or High Plateau, of the northern Andes Mountains.

``The Altiplano is like a giant cup, and Titicaca is the deepest point in the vast plateau, so most of the precipitation in the Altiplano drains into the lake,`` says Stanford geologist Robert B. Dunbar, one of the authors of the Science study.

Because very little water drains out of Titicaca, the lake serves as a reliable archive of rainfall patterns over many centuries - not just on the Altiplano, but in a large portion of tropical South America, according to Dunbar and his co-authors.

``Titicaca is the only large and deep freshwater lake in South America, and in deeper portions of the lake, sediment has accumulated continuously for at least the past 25,000 years,`` they add.

The authors point out that earlier studies of Titicaca relied on coring samples from the lake bottom taken at depths of 150 feet or less. To obtain an older and more complete climate record, a team of geologists led by Science co-author Paul A. Baker of Duke University collected three new samples at 270 feet, 450 feet and 690 feet below the surface.

Baker, Dunbar and their colleagues were able to reconstruct a history of precipitation in the Altiplano by determining how water l
'"/>

Contact: Mark Shwartz
mshwartz@stanford.edu
650-723-9296
Stanford University
25-Jan-2001


Page: 1 2 3

Related biology news :

1. Student science contest participation influences study, career choices, alumni say
2. New study shows hope for treating inhalant abuse
3. International study findings link acne-like rash to effectiveness of new targeted cancer treatment
4. Cigarette smoke causes breaks in DNA and defects to a cells chromosomes, Pitt study finds
5. New study indicates arsenic could be suitable as first-line treatment in type of leukaemia
6. Phase II trials of second-generation antisense cancer drug planned following successful early study
7. Preclinical safety study shows adipose-derived stem cells improve heart function after heart attack
8. Indiana University, EPA to study airborne PCBs
9. K-State, other universities to study how climate affects plant evolution
10. USC study links historical increases in life span to lower childhood exposure to infection
11. Washington University in St. Louis leads group studying aging process

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Lake Titicaca study sheds new light global climate change

(Date:4/17/2014)... trials to treat tuberculosis could be the basis for ... bacteria, fungal infections and parasites, yet evade resistance, according ... collaborators. , Led by U. of I. chemistry professor ... drug SQ109 attacks the tuberculosis bacterium, how the drug ... to malaria and how targeting multiple pathways reduces ...
(Date:4/17/2014)... West Orange, NJ. April 16, 2014. Kessler Foundation ... for $1.8 million from the Department of Defense ... PhD, is principal investigator for the randomized, double-blinded, ... to improve bone and muscle strength after spinal ... Human Performance & Engineering Research at Kessler Foundation. ...
(Date:4/17/2014)... Occurring in about one per eight hundred births, Down ... frequent genetic cause of intellectual disability. It results from ... a third copy of chromosome 21 (1% of the ... his team in the Department of Genetic Medicine and ... Medicine, published in Nature , shed light on ...
Breaking Biology News(10 mins):Multitarget TB drug could treat other diseases, evade resistance 2Kessler Foundation awarded Department of Defense grant for spinal cord injury research 2Trisomy 21: How an extra little chromosome throws the entire genome off balance 2Trisomy 21: How an extra little chromosome throws the entire genome off balance 3
(Date:1/15/2014)... A study has been launched to test ... track could help to tackle the problem of obesity.  This ... GP surgery based in Stowmarket) and academics at University Campus ... Telemetry technology, which is inspired by equipment used to collect ...
(Date:1/15/2014)... Two champions of science, technology, engineering, ... an annual competition for middle and high school students ... STEM study. The competition presents students with real-world problems ... Aptitude, Mathematics, and Sciences is a program administered ...
(Date:1/15/2014)... 15, 2014 DTS Language Services, Inc ... Web Portal for Life Science organizations who need document translations. ... subject matter of their documents in advance with a selection ... time-to-delivery of translations, often a critical factor in clinical and ...
(Date:1/15/2014)... Freeslate, Inc ., the leading ... Lupin Limited, one of India’s top five pharmaceutical companies, ... System for high throughput solid form screening. ... a wide range of quality, affordable generic and branded ...
Breaking Biology Technology:Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 2Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 3Formula 1 Technology Tackles Obesity in Unique Healthcare Partnership 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5DTS Improves Efficiency for Life Science Document Translations 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3
Cached News: