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:10/18/2014)... suspected genetic conditions, a certain type of exome sequencing ... than traditional molecular diagnostic methods, according to a study ... released to coincide with the American Society of Human ... protein­coding region of the genome (the complete set of ... organism), has been rapidly applied in research settings and ...
(Date:10/16/2014)... Cancer constantly wages war on the human body. ... a stalemate. In pancreatic cancer, this stalemate—known as ... becoming aggressively malignant, a phenomena that is poorly ... in the laboratory of Salvatore Torquato, a Professor ... the conditions surrounding tumor dormancy and the switch ...
(Date:10/16/2014)... Syncytial Virus causes severe respiratory tract infections and ... year. Scientists at VIB and Ghent University have ... counteract this common virus infection. , Xavier ... that paves the way for the development of ... virus that causes suffering in numerous small children ...
Breaking Biology News(10 mins):Study examines type of exome sequencing and molecular diagnostic yield 2Study examines type of exome sequencing and molecular diagnostic yield 3Modeling tumor dormancy 2New perspectives for development of an RSV vaccine 2
(Date:10/20/2014)... Oct. 20, 2014 PureTech , a ... big healthcare problems, announced today the closing of ... participation from Invesco Perpetual, a $120 Billion group ... drive PureTech,s existing pipeline forward and to advance ... the scientific creativity to really go for the ...
(Date:10/19/2014)... (PRWEB) October 19, 2014 The Latin ... the market in Latin America with analysis and forecast ... in 2013, and is expected to reach $2,366.8 million ... to 2018. , Browse through the TOC of the ... idea of the in-depth analysis provided. It also provides ...
(Date:10/19/2014)... The Asian Automatic patient billing report ... and forecast of revenue. The Automatic patient billing market ... million by 2018, at a developing CAGR of 7.2% ... of the Asian Automatic patient billing market, to get ... provides a glimpse of the segmentation of this market ...
(Date:10/19/2014)... (PRWEB) October 19, 2014 The ... Defense, & Homeland Security), Technology, Payload, Type & ... and segments the global unmanned ground vehicle market ... and forecasting of market sizes. The report also ... and opportunities impacting it along with the adoption ...
Breaking Biology Technology:PureTech Announces Expansion with Oversubscribed $55M Funding Round 2PureTech Announces Expansion with Oversubscribed $55M Funding Round 3PureTech Announces Expansion with Oversubscribed $55M Funding Round 4PureTech Announces Expansion with Oversubscribed $55M Funding Round 5PureTech Announces Expansion with Oversubscribed $55M Funding Round 6The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 2The Latin American hardware encryption display market is expected to reach $2,366.8 million by 2018 - New Report by MicroMarket Monitor 3The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 2The Asian Automatic patient billing market is estimated to grow to around $463.9 million by 2018 - New Report by MicroMarket Monitor 3Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 2Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 3Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 4Unmanned Ground Vehicle (UGV) Market Estimated to Reach $8.26 Billion by 2020 - New Research Report by MarketsandMarkets 5
Cached News: