Al-Jasser leads Saudi participation in 41st ICAO Assembly    Nuclear and Radiological Regulatory Commission Signs MoU with U.S. Nuclear Regulatory Commission    Saudi Arabia Achieves the Best Historical Result and Advances 12 Places Globally in E-Government Development Index    New Saudi defense minister meets Yemeni Presidential Leadership Council    UAE President, King of Bahrain congratulate Crown Prince on his new appointment    Khalid bin Salman reaffirms resolve to follow Crown Prince's path to build professional military forces    Saudi Stock Exchange Main Index Ends Trading Higher at 11,170 Points    KAPSARC: Saudi economy 60% more resilient to oil market shocks as a result of Vision 2030 reforms    Saudi Arabia to establish new unified regulator for insurance sector    Bank of England takes emergency action to stabilize UK economy, after earlier IMF warning    Hajj ministry replaces 'Etamarna' application with 'Nusuk'    Norway and Denmark tighten security around energy infrastructure after pipeline 'attack'    What is Popular Front of India and why has India outlawed it? PFI ban    OIC chief congratulates Crown Prince on becoming Saudi PM    Muscat Stock Exchange Index Ends Trading Lower    Body of famed US climber found on Mt Manaslu in Himalayas    Governor of Makkah Region Receives French Consul    Prince Khalid Al-Faisal Receives Kuwaiti Consul    KAUST Selects HPE to Build Powerful Supercomputer "Shaheen III"    Saudi Arabia, Senegal Sign Agreement to Establish Joint Business Council    Supported by KSrelief, Artificial Limbs Center Provides Medical Services to 551 Patients in Taiz, Yemen, in August    Saudi Investment Minister Meets Senegal's President, Chairs Saudi-Senegalese Joint Committee Meeting    10th Airplane of Saudi Relief Airlift Loaded with 30 Tons of Relief Items Arrives in Pakistan to Support Flood Victims    Asian Shares Sharply Lower    Hurricane Ian: Florida fears catastrophic flooding as storm nears    Yoga introduced to Saudi universities    Pregnant woman and her fetus rescued after being run over in Jeddah    'Gate to the East', all the way spectacular artwork from Saudi Arabia to China    Islamic Minister Al-Sheikh: Juristic judgment catalyst to salvage Islamic Ummah    Federer bows out of tennis with final match    Culinary Arts Commission Registers 13 Foods on Slow Food List of Endangered Food    Australian Football League: Racism allegations prompt calls for inquiry    F1 returns to Jeddah in 2023 March    72% of Children Globally have been Victims of Cyber Threats    Australian football club hit by 'harrowing' racism, bullying claims    Saudi National Football Team Continues Preparations for Friendly Match against Ecuador    Saudi Futsal Team Beats San Marino, Wins Silver in Croatian International Championship    During 2nd Global AI Summit.. AI-powered Early Breast Cancer Detection Program Launched    Triple talaq: India Muslim women in limbo after instant divorce ruling    Film Commission Reviews Film Industry Prospects in Saudi Arabia at Venice International Film Festival    Saudi national volleyball team loses to Kyrgyzstan in Asian Challenge Cup final    Saudi national volleyball team beats Uzbekistan, qualifies for the final of the Asian Challenge Cup    Ka'aba door bears witness to Saudi rulers' care for the House of God Kaaba' door, repentance' door contain more than 280 KG of pure gold    How Aamir Khan adapted Forrest Gump to Bollywood Laal Singh Chaddha    Custodian of the Two Holy Mosques Delivers Speech to Pilgrims, Citizens, Residents and Muslims around the World    Sheikh Al-Issa in Arafah's Sermon: Allaah Blessed You by Making It Easy for You to Carry out This Obligation. Thus, Ensure Following the Guidance of Your Prophet    Custodian of the Two Holy Mosques addresses citizens and all Muslims on the occasion of the Holy month of Ramadan    Pilgrims Perform Dhuhr and Asr Prayers at Arafat Holy Site    

Thank you for reporting!
This image will be automatically disabled when it gets reported by several people.

Arctic now warmest in 2000 years, researchers say
Published in Saudi Press Agency on 03 - 09 - 2009

Climate-warming greenhouse
gas emissions pushed Arctic temperatures in the last decade to
the highest levels in at least 2,000 years, reversing a natural
cooling trend that should have lasted four more millennia, according to Reuters.
Carbon dioxide and other gases generated by human
activities overwhelmed a 21,000-year cycle linked to gradual
changes in Earth's orbit around the Sun, an international team
of researchers reported on Thursday in the journal Science.
"I think it really underscores how sensitive the Arctic is
to climate change ... and it's really the place where you can
see first what's happening to the (climate) system and how the
rest of the Earth will or might follow," David Schneider, a
co-author and a scientist with the U.S. National Center for
Atmospheric Research said in a telephone interview.
The big cool-down started about 7,000 years ago, and Arctic
temperatures bottomed out during the so-called "Little Ice Age"
that lasted from the 16th to the mid-19th centuries,
dove-tailing with the start of the Industrial Revolution.
This cooling trend was caused by a characteristic wobble in
Earth's orbit that very gradually pushed the Arctic away from
the Sun during the northern summer. Earth is now about 620,000
miles (1 million km) farther from the Sun in the Arctic summer
than it was 2000 years ago, said Darrell Kaufmann of Northern
Arizona University.
This cooling should have continued through the 20th and
21st centuries and beyond as the 21,000-year cycle played out.
This latest research confirms that it hasn't.
"If it hadn't been for the increase in human-produced
greenhouse gases, summer temperatures in the Arctic should have
cooled gradually over the last century," Bette Otto-Bliesner, a
co-author from the National Center for Atmospheric Research,
said in a statement.
What happens in the Arctic doesn't stay there, since it is
among the world's biggest weathermakers, sometimes called
Earth's air-conditioner. As Arctic sea ice melts in summer, it
exposes the darker-colored ocean water, which absorbs sunlight
instead of reflecting it, accelerating the warming effect.
Arctic warming also affects land-based glaciers; if these
melt, they would contribute to a global rise in sea levels.
Warming in this area could also thaw frozen ground called
permafrost, sending methane, a powerful greenhouse gas, into
the atmosphere.
Climate scientists have long known that Earth wobbles in
its orbit, which affects how much sunlight reaches the Arctic
in the summer. This is the first time a large-scale study has
tracked decade-by-decade changes in Arctic summer temperatures
this far back in time.
To figure this out, researchers looked at natural archives
of temperature -- tree rings, ice cores and lake sediments --
along with computer models, which tallied closely with the
natural record.
Average summer temperatures in the Arctic have increased by
about 3 degrees F (1.66 degrees C) from what they would have
been had the long-term cooling trend remained intact.

Clic here to read the story from its source.