Navigation Links
20th century one of driest in 9 centuries for northwest Africa

Droughts in the late 20th century rival some of North Africa's major droughts of centuries past, reveals new research that peers back in time to the year 1179.

The first multi-century drought reconstruction that includes Morocco, Algeria and Tunisia shows frequent and severe droughts during the 13th and 16th centuries and the latter part of the 20th century.

An international research team figured out northwest Africa's climate history by using the information recorded in tree rings. The oldest trees sampled contain climate data from the medieval period. One tree-ring sample from Morocco dates back to the year 883.

"Water issues in this part of the world are vital," said lead researcher Ramzi Touchan of the University of Arizona. "This is the first regional climate reconstruction that can be used by water resource managers."

In most of North Africa, instruments have been recording weather information for 50 years or less, too short a time to provide the long-term understanding of regional climate needed for resource planning, he said.

"One of the most important ways to understand the climate variability is to use the proxy record, and one of the most reliable proxy records is tree rings," said Touchan, an associate research professor at UA's Laboratory of Tree-Ring Research.

The team has developed the first systematically sampled network of tree-ring chronologies across northwest Africa, said co-author David Meko, also of UA's Laboratory of Tree-Ring Research.

The network allowed the researchers to analyze the patterns of past droughts over the whole region, said Meko, a UA associate research professor. The width of the annual growth rings on trees in semi-arid environments is highly correlated with the amount of precipitation.

The team found the region's 20th-century drying trend matches what climate models predict will occur as the climate warms. The research is the first to compare

Contact: Jennifer Fitzenberger
University of Arizona

Page: 1 2 3

Related biology news :

1. 21st-century pack mule: MITs exoskeleton lightens the load
2. St. Jude settles century-old debate on origin of mammalian network of lymphatic vessels
3. Carnivores in recent study help Bergmanns rule reach the 21st century
4. Building the future -- 21st century nano tools to repair the nervous system
5. How will government spur technological innovation in the 21st century?
6. Biotechnology needs 21st century patent system: Expert
7. Scientists compiled 20th century temperature data in Spain as evidence of climatic change
8. The 21st century tomato
9. Marine debris will likely worsen in the 21st century
10. Scientists discover 21st century plague
11. Synthetic biology key in the 21st century
Post Your Comments:
Related Image:
20th century one of driest in 9 centuries for northwest Africa
(Date:7/31/2014)... According to the U.S. Census Bureau, Latinos are the ... of the population. Approximately one-third of Latinos are ... obese compared to non-Hispanic Whites. , NYU College ... candidate, has sought to identify the factors that contribute ... qualitative studies that focused on food patterns in Latina ...
(Date:7/31/2014)... follow-up study (HPV-023; NCT00518336) shows the sustained ... papilloma virus (HPV) vaccine Cervarix. Women vaccinated ... for more than nine years, and vaccine ... This is the longest follow-up report for ... for the full paper. , ...
(Date:7/31/2014)... international team of scientists from Spain, France, and ... beetle that is the oldest definitive member of ... in amber. The discovery and description were made ... X-ray synchrotron imaging technique, which allows the detailed ... The new species is described in the journal ...
Breaking Biology News(10 mins):NYU research looks to combat US Latina immigrant obesity 2Sustained efficacy, immunogenicity, and safety for GlaxoSmithKline's HPV vaccine 2Sustained efficacy, immunogenicity, and safety for GlaxoSmithKline's HPV vaccine 3
... whole organism, as they may lead to life-threatening illnesses ... report how byproducts of respiration cause mispairing of subunits ... cells controls the form and function of every cell ... encoded in the linear sequence of the four subunits ...
... , NEW YORK, May 22, 2013. Plastic additives ... and just about everywhere: They turn up in ... tubing andaccording to the Centers for Disease Control ... as harmless, phthalates have come under increasing scrutiny. ...
... occur in the body, stem cells in the blood ... mature immune cells that can fight off illness. But ... potentially leading to the development of serious blood conditions ... by biologists at the California Institute of Technology (Caltech) ...
Cached Biology News:DNA damage: The dark side of respiration 2Study links chemicals widely found in plastics and processed food to elevated blood pressure in children and teens 2Keeping stem cells strong 2
(Date:8/1/2014)... 02, 2014 For the past ... under the auspices of the Armed Forces Institute ... of academic research organizations in the development of ... AFIRM is a multi-institutional, inter¬disciplinary network working to ... injuries suffered by US servicemen and women in ...
(Date:8/1/2014)... of topological electron flow in certain semiconductors. In ... of the material but not through the bulk. ... impurities in the material the electrons will continue to ... In the photonic equivalent, light flows not through and ... of an array of tiny glass loops fabricated on ...
(Date:8/1/2014)... Shreveport, LA (PRWEB) August 01, 2014 Chantel ... to conduct research for 10 40-hour weeks with Dr. Juan ... effects of diabetic retinopathy, a common diabetic eye disease caused ... , "What Chantel and Eli accomplished is quite remarkable,” ... was only a concept when they started, and together carried ...
(Date:8/1/2014)... Applied DNA Sciences, Inc. ... technology and product authentication solutions, will host a conference ... fiscal third quarter results. The Quarterly Report on Form ... end of the day on Monday August 11, 2014. ... a conference call beginning at 9:00 A.M. Eastern Daylight ...
Breaking Biology Technology:Wounded Warriors a Focus of the 12th New Jersey Symposium on Biomaterials Science 2On-chip topological light 2On-chip topological light 3Two Centenary College Students Tackle Diabetic Retinopathy Research 2Applied DNA Sciences to Host Conference Call Tuesday August 12, 2014 2Applied DNA Sciences to Host Conference Call Tuesday August 12, 2014 3
... 3 Metabolex, Inc., a,biopharmaceutical company focused ... medicines for the treatment of metabolic diseases,announced ... MBX-8025) have been,recognized in Windhover,s "Top 10 ... respective categories. MBX-2982, a potential,first-in-class treatment for ...
... Sunesis,Pharmaceuticals, Inc. (Nasdaq: SNSS ), a biopharmaceutical ... therapeutics for,the treatment of solid and hematologic cancers, today ... upcoming conferences:, Rodman & Renshaw 10th Annual Healthcare ... Wednesday, November 12, 2008, 2:00 p.m. EST, ...
... Catalyst,Pharmaceutical Partners, Inc. (Nasdaq: CPRX ) a ... prescription,drugs for the treatment of drug addiction and ... Chief Executive,Officer, will be presenting an overview of ... Global Investment Conference on Tuesday, November 11,2008 at ...
Cached Biology Technology:Two Metabolex Projects Recognized in Windhover's Top 10 Lists for Partnering Opportunities 2Two Metabolex Projects Recognized in Windhover's Top 10 Lists for Partnering Opportunities 3Sunesis to Present at Upcoming Conferences 2Catalyst Pharmaceutical Partners to Present at the Rodman & Renshaw 10th Annual Global Investment Conference 2
... a score of movement counts, similar to an ... up to 6 subjects at once, in two ... Test a whole experimental group at once, and ... Upgradeable for a variety of other spatial ...
... OutputCumulates a score of movement counts, similar to ... track up to 6 subjects at once, in ... Can outpt a sync pulse to coordinate ... use animal location and timing information to control ...
... Place AvoidanceIncludes all features of Tracker, plus software ... user defined subsection of the arena, and trigger ... of instruments all built around a video camera, ... can track two fields at once and up ...
... for foraging behavior.The Spatial Behavior line is a ... camera, frame grabber, and feature extraction software and ... up to 6 moving animals. Software automatically ... allows video replay of all or machine-selected events. ...
Biology Products: