HOME >> BIOLOGY >> NEWS
Research reveals use of tree rings and ocean temperature shifts in anticipating megadroughts

Not long ago, conventional wisdom was that you couldn't predict the climate for more than a few days in advance. Then came the awareness of El Nio and La Nia and the forecast window increased to as much as 6 to 9 months, depending on the region and season. But a forthcoming study in the Geophysical Research Letters suggests that opposing shifts in Tropical Pacific and North Atlantic Ocean temperatures may foretell persistence of disastrous, multiyear droughts across the North American continent.

Forecasts longer than the 6 to 9 months typical today, if possible, would rely on two principles: the well-defined relationship between temperatures in the upper one meter of the ocean, so-called sea surface temperatures, and precipitation on land. The second principle is the ocean's thermal inertia. Once an ocean basin begins to cool or warm anomalously, it generally tends to stay that way for several years and even decades. If these slow shifts in ocean regime can be identified in their early stages, then perhaps they can used to assess the probability of disastrous, multiyear droughts across the North American continent and elsewhere.

In this light, the study published today evaluates multidecadal, precipitation variability across a network of 750-year-long tree-ring chronologies from the central and southern Rockies. The study suggests that the Great Plains, the Rockies, and the Southwest are stricken by the same 'megadrought' when for multiple years the tropical Pacific turns cold at the same time that the North Atlantic warms. The geographic scale of such megadroughts is determined by the failure of winter (November-March), early summer (May-June) and mid- to late summer (July-September) precipitation, each of which has specific links to tropical Pacific and North Atlantic sea surface temperatures.

A team of researchers from the U.S. Geological Survey, University of Wyoming and Middlebury College (Vermont) analyzed precipitation changes occurri
'"/>

Contact: Julio Betancourt
jlbetanc@usgs.gov
520-670-6821
United States Geological Survey
14-Feb-2003


Page: 1 2 3

Related biology news :

1. Researchers determine genetic cause of Timothy syndrome
2. Researchers find color sensitive atomic switch in bacteria
3. Schepens Eye Research Institute receives Roadmap grant to develop center for curing eye diseases
4. Researchers identify protein promoting vascular tumor growth
5. Researchers devise potent new tools to curb ivory poaching
6. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
7. Researchers ID chlorophyll-regulating gene
8. Environmental issues center of Inland Northwest Research Alliance 4th Annual Symposium
9. Research suggests new avenue for stopping, preventing colon cancer
10. Researchers develop fast track way to discover how cells are regulated
11. Research on carbohydrate metabolism receives historical recognition

Post Your Comments:
(Date:2/5/2015)... January 28, 2015 New Market ... And Segment Forecasts To 2020 has Been Added to ... market is expected to reach USD 5.10 billion by ... Research, Inc. IR cameras help identify the site of ... to witness surging demand in medical imaging applications. They ...
(Date:2/5/2015)... Feb. 3, 2015 Despite a lack ... industries such as consumer electronics, automotive, storage and ... mount technology (SMT) screen printers. Innovations in electronics ... will push the adoption curve up. Meanwhile, sale ... as glue dispensers are indispensable in the production ...
(Date:1/22/2015)... , Jan. 13, 2015  Today, FreeWavz ( ... launched its crowdfunding campaign on Fundable, https://www.fundable.com/freewavz ... build of production capacity to meet customer demand. ... Photo - http://photos.prnewswire.com/prnh/20150113/168790 ...
Breaking Biology News(10 mins):IR Camera Market Worth $5.10 Billion By 2020: Grand View Research, Inc. 2IR Camera Market Worth $5.10 Billion By 2020: Grand View Research, Inc. 3End-user Demand Spurs Global SMT Screen Printers and Glue Dispensers Market 2End-user Demand Spurs Global SMT Screen Printers and Glue Dispensers Market 3FreeWavz Launches on Fundable to Drive Speed-to-Market in 2015 2
(Date:3/3/2015)... Mar. 03, 2015 Research and Markets ... of Jain PharmaBiotech,s new report "Gene Therapy ... offering. , Gene therapy technologies ... vectors and cell therapy with genetically modified vectors. ... delivery and various routes of administration as well ...
(Date:3/3/2015)... 2015 DNA Diagnostics Center (DDC), one of the ... its 20 th anniversary today. Headed by President ... consumer services company that focuses on DNA testing across ... and generates a significant portion of sales across international ... Peter Vitulli acknowledges the anniversary of ...
(Date:3/3/2015)... 3, 2015  PDL BioPharma, Inc. (PDL or the ... the third of three shareholder lawsuits filed in the ... On February 2, 2015, a securities lawsuit that ... of a putative class of purchasers of the Company,s ... 2:14-CV-01526-APG-NJK (D. Nev.), was voluntarily dismissed without prejudice.  Shortly ...
(Date:3/2/2015)... and Fort Washington, PA (PRWEB) March 02, 2015 ... (ASHG) and ReachMD announced today the ... audio interviews designed to educate healthcare professionals on the ... , The series features peer-to-peer interviews conducted ... such as:, ,     Translational Genomics and Health ...
Breaking Biology Technology:Gene Therapy Market Report 2014-2024 - Technologies, Markets and Companies 2Gene Therapy Market Report 2014-2024 - Technologies, Markets and Companies 3DNA Diagnostics Center, One of The World's Largest DNA Testing Labs, Celebrates Their 20th Anniversary 2DNA Diagnostics Center, One of The World's Largest DNA Testing Labs, Celebrates Their 20th Anniversary 3PDL BioPharma Announces Dismissal of Third and Final Shareholder Lawsuit 2American Society of Human Genetics (ASHG) and ReachMD Launch Series on Genetics and Genomics 2American Society of Human Genetics (ASHG) and ReachMD Launch Series on Genetics and Genomics 3
Cached News: