Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. Earth Science News .




WATER WORLD
Recent decades likely wettest in four millennia in Tibet
by Staff Writers
Lanzhou, China (SPX) Feb 20, 2014


File image.

Recent decades may have been the wettest in 3,500 years in North East Tibet - according to climate researchers at the University of East Anglia (UK) and the Chinese Academy of Sciences (Lanzhou, China).

Researchers looked at 3,500-year-long tree ring records from North East Tibet to estimate annual precipitation. They found that recent decades have likely been the wettest on record in this semi-arid region.

The precipitation records have been reconstructed using sub-fossil, archaeological and living juniper tree samples from the north-eastern Tibetan Plateau. They reveal a trend towards wider growth rings, implying moister growing conditions - with the last 50 years seeing increasing amounts of rainfall.

Notable historical dry periods occurred in the 4th Century BC and in the second half of the 15th Century AD.

Dr Tim Osborn from UEA's Climatic Research Unit said: "Our collaboration with scientists from China has been very fruitful, leading to what is currently the longest tree-ring-width record in the cold and arid north-eastern Tibetan Plateau.

"Not only is the record very long, it is based on samples from more than 1000 trees, some of which have an individual lifespan of more than 2000 years. These are among the longest-lived trees in the world."

Not only are these trees long-lived, but they are useful for understanding how climate has changed. The widths of the tree rings show a close correspondence with observations from rain gauges over the last 55 years, such that tree rings in wetter years tend to be wider than tree rings in drier years.

Dr Osborn said: "The most recent few decades have, on average, the widest rings in the 3,500-year record which suggests that this may have been the wettest period, perhaps associated with global warming during the last century.

Indeed, over the last two thousand years when the Northern Hemisphere is warm it appears to be wetter in the Mountains of North East Tibet. This suggests that any further large-scale warming might be associated with even greater rainfall in this region - though we note that other factors could also have contributed to the increased ring widths."

'A 3500-year tree-ring record of annual precipitation on the north-eastern Tibetan Plateau' is published in Proceedings of the National Academy of Sciences.

.


Related Links
University of East Anglia
Water News - Science, Technology and Politics






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





WATER WORLD
Irish Water issues first tender for Dublin water supply project
Dublin, Ireland (UPI) Feb 19, 2013
The utility Irish Water has issued a tender for its first infrastructure project - a $685 million effort to supply Dublin with water from the River Shannon. The quasi-public company was started last year as a subsidiary of Bord Gais Eireann to improve and coordinate the notoriously inefficient operations of water services in Ireland, which had been under the jurisdiction of 34 local au ... read more


WATER WORLD
100-tonne radioactive water leak at Fukushima: TEPCO

Post-tsunami deaths outnumber disaster toll in one Japan area

Police to investigate death of Manus asylum detainee

Outsmarting nature during disasters

WATER WORLD
Google unveils 'Project Tango' 3D smartphone platform

Gecko-inspired Adhesion: Self-cleaning and Reliable

An essential step toward printing living tissues

Single chip device to provide real-time 3D images from inside the heart, blood vessels

WATER WORLD
China agrees to export water to Taiwan-controlled islands

Laos dam plan threatens existence of rare dolphin: WWF

Recent decades likely wettest in four millennia in Tibet

Graduate Student Makes Major Discovery About Seal Evolution

WATER WORLD
Study predicts Antarctic ice melting will endure

Increase in Arctic Cyclones is Linked to Climate Change

Arctic biodiversity under serious threat from climate change according to new report

NOAA researcher says Arctic marine mammals are ecosystem sentinels

WATER WORLD
Honeybees may be making wild cousins ill: study

Nitrogen-tracking tools for better crops and less pollution

Agricultural productivity loss as a result of soil and crop damage from flooding

BGU Researchers Reveal that Organic Agriculture Can Pollute Groundwater

WATER WORLD
Up to 9,000 people threatened by Mozambique flooding

Mount Hood study suggests volcano eruptibility is rare

British insurers called in for floods talks

Volcanoes, including Mt. Hood, can go from dormant to active quickly

WATER WORLD
China-Africa trade surpassed $200 billion in 2013: Xi

China pillages Africa like old colonialists: Jane Goodall

Libya denies rumours of impending coup

The new Africa -- green shoots in biosciences

WATER WORLD
What makes memories last?

Baylor Sheds New Light on the Habitat of Early Apes

Thinking it through: Scientists seek to unlock mysteries of the brain

Cortical convolutions controlled in sections




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.