Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



CLIMATE SCIENCE
Cooling in high and mid-latitudes led to aridification in Northern Africa
by Staff Writers
Potsdam, Germany (SPX) Nov 14, 2017


Their hydrogen isotopic composition can be used as an indicator of past precipitation intensity. The wax isotopes told the researchers about rainfall in Cameroon and the central Sahel-Sahara over the past several millennia and showed a rapid aridification around 5500 years before now.

It is one of the driest regions of the Earth, yet, in a cave in the Egyptian Sahara, paintings have been found depicting people swimming. This stone-age art is thought to be up to ten thousand years old and falls into the so-called African Humid Period between 11,500 and 5,500 years before now.

Climate scientists still puzzle about the rapidity of aridification and the climate processes that led to this. Now, a group of researchers from several European institutions found that northern high-latitude cooling played a role in triggering the rapid termination of the African Humid Period.

According to the study, appearing in Nature Communications, the temperature drop in the Arctic and in the mid-latitudes of the northern hemisphere weakened strong winds at high altitudes over Africa, the so-called Tropical Easterly Jet.

"This cooling reduced precipitation over Africa, and in combination with a range of other complex climate feedback mechanisms tipped the humid system towards aridification", explains the first author of the study, James Collins from Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences and Alfred Wegener Institute - Helmholtz Center for Polar and Marine Research (AWI) in Bremerhaven.

The findings are based on analyses of ancient plant leaf wax found in the sediments of the Gulf of Guinea in combination with computer models of the climate system. The wax lipids comprise n-alkanes, i.e. long-chain hydrocarbons, that are produced by plants to protect their leaves.

Their hydrogen isotopic composition can be used as an indicator of past precipitation intensity. The wax isotopes told the researchers about rainfall in Cameroon and the central Sahel-Sahara over the past several millennia and showed a rapid aridification around 5500 years before now.

Although the high-latitude cooling probably did not act alone in driving the aridification, it seems to be have been the missing piece in the puzzle and acted to set the aridification process in motion. "Based on our findings, it appears that future Arctic warming and reduced sea-ice cover could have a strong effect on tropical rainfall", says James Collins.

Project leader Enno Schefub from the MARUM - Center for Marine Environmental Sciences at the University of Bremen, Germany, adds: "The project was funded by the Deutsche Forschungsgemeinschaft in the priority programme 'Integrated Analysis of Interglacial Climate Dynamics (INTERDYNAMIC)' with the aim to identify potential mechanisms triggering abrupt changes under current climatic conditions. With this study we could show that small changes in one area can have large impacts in remote places, something that should be considered in future assessments of climate projections."

Research paper

CLIMATE SCIENCE
A drier south: Europe's drought trends match climate change projections
Logan UT (SPX) Oct 26, 2017
On the same day that global leaders wrapped up an international water and climate summit in Rome, researchers published new findings that suggest European drought trends are lining up with climate change projections. Their study, published Oct. 25 in Scientific Reports, shows that two major drought indices are deviating from one another across Europe in a manner consistent with climate cha ... read more

Related Links
GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre
Climate Science News - Modeling, Mitigation Adaptation


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

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

CLIMATE SCIENCE
Stressed seedlings in space

Orbital ATK's to deliver supplies to International Space Station

How Does Your Space Garden Grow

NanoRacks Deploys Second Kaber-Class Microsatellite This Week, First On-Orbit Assembly

CLIMATE SCIENCE
Vega launches Earth observation satellite for Morocco

Russia embezzlement probe at rocket firm Soyuz

Alaska Aerospace Launches Aurora Launch Services Company

Launch your design with Cheops

CLIMATE SCIENCE
NASA Opens $2 Million Third Phase of 3D-Printed Habitat Competition

Insight will carry over two million names to Mars

Opportunity Does a Wheelie and is Back on Solid Footing

Martian Ridge Brings Out Rover's Color Talents

CLIMATE SCIENCE
China's reusable spacecraft to be launched in 2020

Space will see Communist loyalty: Chinese astronaut

China launches three satellites

Mars probe to carry 13 types of payload on 2020 mission

CLIMATE SCIENCE
European Space Week starts in Estonia

New Chinese sat comms company awaits approval

Myanmar to launch own satellite system-2 in 2019: vice president

Eutelsat's Airbus-built full electric EUTELSAT 172B satellite reaches geostationary orbit

CLIMATE SCIENCE
A new way to mix oil and water

Building better silk

Measuring atoms for better navigation and mineral detection

Discovery of a new structure family of oxide-ion conductors SrYbInO4

CLIMATE SCIENCE
Scientists find potential 'missing link' in chemistry that led to life on earth

18-Month Twinkle in a Forming Star Suggests a Very Young Planet

Overlooked Treasure: The First Evidence of Exoplanets

Atmospheric beacons guide NASA scientists in search for life

CLIMATE SCIENCE
Watching Jupiter's multiple pulsating X-ray Aurora

Help Nickname New Horizons' Next Flyby Target

Juno Aces 8th Science Pass of Jupiter, Names New Project Manager

Jupiter's X-ray auroras pulse independently




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






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - 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. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. 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