March 29, 2024, 12:20:30 am
Welcome,
Guest
. Please
login
or
register
.
1 Hour
1 Day
Forever
Login with username, password and session length
News
: Site provides evidence for ancient comet explosion
http://www.thenewstribune.com/news/nationworld/story/173177.html
Home
Help
Arcade
Gallery
Links
Staff List
Calendar
Login
Register
Global Warming Could Cool N. America in a Few Decades?
Atlantis Online
>
Forum
>
Earth Changes
>
Global Warming
>
Global Warming Could Cool N. America in a Few Decades?
Pages: [
1
]
Go Down
« previous
next »
Print
Author
Topic: Global Warming Could Cool N. America in a Few Decades? (Read 104 times)
0 Members and 9 Guests are viewing this topic.
Quicksilver
Full Member
Posts: 6
Global Warming Could Cool N. America in a Few Decades?
«
on:
September 16, 2009, 02:02:03 am »
Global Warming Could Cool N. America in a Few Decades?
Kate Ravilious
for National Geographic News
September 14, 2009
Global warming could actually chill down North America within just a few decades, according to a new study that says a sudden cooling event gripped the region about 8,300 years ago.
Analysis of ancient moss from Newfoundland, Canada, links an injection of freshwater from a burst glacial lake to a rapid drop in air temperatures by a few degrees Celsius along North America's East Coast.
This event created a colder year-round climate with a much shorter growing season for about 150 years, from northern Canada to what is now Cape Hatteras, North Carolina.
The results suggest that North America's climate is highly sensitive to meltwater flowing into the ocean, said lead study author Tim Daley of Swansea University in the U.K.
The work also means that history could repeat itself: Currently Greenland's ice sheet is melting at a rapid clip, releasing freshwater into the North Atlantic.
(Related: "Greenland Meltwater Can Drain Faster Than Niagara Falls.")
In a worst-case scenario, the authors say, a sudden melt could trigger another regional cooling event—although other experts say today's extreme, human-driven warming might cancel out any strong cooling effect.
Cooling Record
Daley and colleagues studied mosses dating back more than 8,700 years that were preserved in a Newfoundland peat bog.
The ratios of two different types of oxygen in the mosses allowed the team to trace changes in atmospheric temperature over time.
When air temperatures are lower, the mosses contain less oxygen-18, a heavier version of the more common type, oxygen-16.
About 8,350 years ago, the amount of oxygen-18 relative to oxygen-16 suddenly dropped, the team reports in the September issue of the journal Geology.
http://news.nationalgeographic.com/news/2009/09/090914-north-america-cooling-warming.html
Report Spam
Logged
Quicksilver
Full Member
Posts: 6
Re: Global Warming Could Cool N. America in a Few Decades?
«
Reply #1
on:
September 16, 2009, 02:05:42 am »
Meltwater flows across the Greenland ice sheet in an undated picture.
A sudden influx of Greenland meltwater into the North Atlantic Ocean could chill down North America within just a few decades, a September 2009 study of ancient Canadian moss suggests.
Photograph by James Balog
Report Spam
Logged
Quicksilver
Full Member
Posts: 6
Re: Global Warming Could Cool N. America in a Few Decades?
«
Reply #2
on:
September 16, 2009, 02:06:56 am »
Previous research had found that, around the same time, a northern ice dam burst, releasing the contents of a vast glacial lake into the Labrador Sea, between Canada and Denmark (see map).
Normally a warm ocean current called the Gulf Stream runs up the east coast of North America, helping to keep the region balmier than it should be, considering how far north it is.
But the entire glacial lake drained within less than a year, injecting a huge pulse of freshwater into the North Atlantic Ocean.
Daley and colleagues think the lake water diluted the salty ocean current and slowed the Gulf Stream, which in turn led to rapid cooling in North America.
"As a result, Canadian summer temperatures would have been similar to those currently experienced in autumn or spring," said team member Neil Loader, also of Swansea University.
Climate records from Greenland and Europe also show a sudden cooling during the same time period, but this is the first clear evidence for a North American chill.
Report Spam
Logged
Quicksilver
Full Member
Posts: 6
Re: Global Warming Could Cool N. America in a Few Decades?
«
Reply #3
on:
September 16, 2009, 02:07:16 am »
Less Dramatic Drop
The moss data show that current climate models "significantly underestimate the impact and duration of the climate perturbation resulting from the megaflood," said Swansea team member Alayne Perrott.
This means these same models might not be accurately predicting what might happen in the future if Greenland's ice sheet continues to melt.
However, some scientists say that the data showing a prehistoric North American cool down may only indicate a coastal phenomenon.
"The study site is very close to the North Atlantic Ocean, and it is very likely that the climate change is primarily an oceanic signal," said Hans Renssen, a climate researcher at Vrije University in Amsterdam, who was not involved in the study.
As for whether today's melt in Greenland could trigger another round of cooling, Renssen thinks it's possible, but he doesn't believe the change would be as dramatic as last time.
(See recent pictures showing a massive Greenland glacier disintegrating.)
In fact, he said, any future cooling is likely to be overwhelmed by human-caused warming, "resulting in no cooling in North America at all, only less warming than without the event."
Report Spam
Logged
Pages: [
1
]
Go Up
Print
« previous
next »
Jump to:
Please select a destination:
-----------------------------
Atlantis Online - Messages
-----------------------------
=> Messages
=> Administrative Messages
=> Commemorating Dates in History
=> Alerts & Warnings
=> Upcoming Events, Releases & Ads
=> Television: Shows & Events
-----------------------------
the Coffee Shop
-----------------------------
=> the Coffee Shop
=> Atlantis: Polls & News
=> Poltical Alerts
=> Causes & Activism
-----------------------------
Videos, Documentaries & Online Movies
-----------------------------
=> Ancient History & Lost Civilizations
=> Ghosts, UFOs & the Esoteric
=> Music, Entertainment & the Arts
=> Conspiracies & Suppressed Knowledge
=> Documentary & Videos
-----------------------------
Ages of the Earth
-----------------------------
=> The Early Earth, Geology & Fossils
=> Dinosaurs
=> Catastrophes & Mass Extinctions
=> Ice Age
=> Humanity's Origins & Civilization's First Steps
-----------------------------
Mythology & Heroic Sagas of Culture & Myth
-----------------------------
=> Mythology
=> Greek Mythology
=> Arthurian Myth
=> Quest for King Arthur
-----------------------------
Atlantis
-----------------------------
=> Atlantis & the Atlantic Ocean
=> Atlantis: Theories & Speculation
=> Plato's Atlantis
=> the Scientific Atlantis
=> Geology & Atlantis
=> Atlantis & the New Age
=> Atlantis in the Media
-----------------------------
Satellite Discoveries & Alternate Archaeology
-----------------------------
=> Alternate Archaeology
=> Satellite Discoveries & Aerial Archaeology
=> the Bock Saga
-----------------------------
Maps, Explorers & Adventurers
-----------------------------
=> the Oceans
=> Islands
=> the Bahamas, Bermuda, Cuba & the West Indies
=> Explorers & Adventurers
=> Maps, Cartographers & Cartography
-----------------------------
Egypt & the Pyramids
-----------------------------
=> Gods of Egypt
=> Egypt & the Pyramids
=> the Giza Complex
=> the Dynasties of Egypt
=> Egypt: Latest Discoveries
-----------------------------
the Guanches, Basques, Berbers & Sea People
-----------------------------
=> Guanches, Basques & Berbers
=> Pirates, Phantom Islands & Stories of the Sea
=> the Sea People
-----------------------------
the Ancient World
-----------------------------
=> Neolithic Europe
=> Stonehenge & the Druids
=> the Library of Alexandria, Ancient Historians & Philosophers
=> Ancient Warfare
=> the Spartans
-----------------------------
the Dawn of Civilization
-----------------------------
=> Africa, the Cradle of Life
=> China & the Asian Empires
=> Eastern Mysticism, India, & the Ancient Far East
=> Zoroastrianism, Arabia & the Near East
=> the Sumerians
=> Ancient Asia Minor
=> Hawaii, Australia, Alaska & the Pacific Rim
-----------------------------
Ancient Mediterranean Cultures
-----------------------------
=> Minoan Crete
=> Phoenicians & Carthage
=> Mediterranean Islands
=> Israelities & the Kabbalah
=> Etruscans
=> Ancient Greece
=> Rome: Empire & Republic
-----------------------------
Ancient European Cultures
-----------------------------
=> The Picts & Celts
=> Ireland: History & Myths
=> Balkan History
=> Italy & Magna Graecia
=> the Vikings & Scandinavia
=> Germanic History
-----------------------------
Timelines of Ancient Europe
-----------------------------
=> History of Britain
=> Scotland: in History & Lore
=> Continental Europe: Past & Present
=> the Dark Ages
=> the Medieval World
=> The Renaissance
-----------------------------
the Ancient Americas
-----------------------------
=> the Ancient Americas
=> Peru: Mysteries & Prehistory
=> Mesoamerican & South American Cultures
===> Aztec
===> Incan
===> Olmec
===> Toltec & Teotihuacan
=> Mayan
=> Native American
=> Canada: Past & Present
-----------------------------
The Crusades, Templars & the Holy Grail
-----------------------------
=> the Crusades
=> the Knights Templar
=> The Holy Grail & Christian artifacts
=> The Sacred Feminine, the Cathars & Gnosticism
=> the Da Vinci Code
-----------------------------
Ancient Mysteries
-----------------------------
=> Philosophy
=> Ancient Mysteries
=> Lemuria, Mu & other sunken civilizations
=> Easter Island
=> Oak Island
-----------------------------
Archaeology & Anthropology
-----------------------------
=> Museums & Universities
=> Archaeology
=> Ancient Languages
=> Archaeological News
=> Underwater Archaeology
-----------------------------
Ancient Knowledge, Mysticism & Sacred Beliefs
-----------------------------
=> Ley Lines, Ancient Astronomy & Archeoastronomy
=> Prophecy, 2012, End Times & the End of the World
=> Sacred Symbols
=> The Ancient Arts: Astrology, Alchemy, the Tarot, Arcane Recondite Practices & the I Ching
-----------------------------
Search for the Sacred
-----------------------------
=> Angels & Angelology
=> Goddess Worship
=> Search for the Sacred
=> World Religions
=> the Urantia Book
=> Wicca, Witchcraft, Paganism & Ritual Magic
-----------------------------
Health & Healing
-----------------------------
=> Health, Healing & Medical News
=> Human Biology
=> Love & Relationships
=> Women's Studies
-----------------------------
Science & Technology
-----------------------------
=> Science, Physics & Technology
=> History of Science
=> Evolution vs. Intelligent Design
=> Human Genetics
-----------------------------
Earth Changes
-----------------------------
=> Earth Changes
=> Global Warming
=> Botany & Plant Life
===> Plants of the Americas that Changed the World
=> Antarctica & the Arctic
-----------------------------
Space
-----------------------------
=> NASA
=> Mars, the Red Planet
=> Life on Other Worlds
=> the Universe
=> Images from Space
-----------------------------
UFOs, Aliens & Future Science
-----------------------------
=> UFO's
=> Aliens & Alien Abduction
=> UFO Evidence & in the Media
=> Alternate History & Multiverses
=> Future Science
=> Time Travel
-----------------------------
the Occult
-----------------------------
=> Ghosts & Apparitions
=> Communicating with the Dead
=> Paranormal Events, Reincarnation & Near Death Experiences
=> the Enchanted World
=> the Supernatural
=> the Occult
-----------------------------
the Unexplained
-----------------------------
=> Cryptozoology
=> Bigfoot Sightings
=> the Unexplained
=> the Hollow Earth, Crop Circles, Strange Structures & Devices
=> Vanishings & Unsolved Murders
-----------------------------
Science Fiction & Fantasy
-----------------------------
=> Lord of the Rings
=> Science Fiction
=> King Kong, Gigantopithecus & the Mountain Gorilla
=> Godzilla, King of Monsters
=> Comic Books
===> Comic Book Creators
===> Videogames & Toys
-----------------------------
Halloween & Seasonal
-----------------------------
=> Halloween
=> Seasonal
=> Monsters of Myth, Movies & Folklore
=> Ghost Stories
=> the Zombie Apocalypse
-----------------------------
Genres of Film & Literature
-----------------------------
=> Universal Horror
=> H. P. Lovecraft
=> Horror
=> Dark Shadows
=> Twin Peaks
=> Online Horror Movies Sci-Fi & TV Series
-----------------------------
Arts & Literature
-----------------------------
=> Online Books & Research Papers
=> Classical Literature & Book Reviews
=> Art History
=> Architecture
=> Sculpture & Statuary
=> the Great Masters
=> Music
-----------------------------
Media & Film
-----------------------------
=> Cinema
=> the History of Film
=> Marilyn Monroe
=> Actresses & Models
=> Entertainment News
-----------------------------
Modern Historical Mysteries
-----------------------------
=> American History
===> Presidents of the United States
=> the World Wars
===> the Great Depression
=> the Holocaust
=> the Middle East: Past & Present
=> Modern History
===> the Industrial Age
===> Civil Rights
=> Great Cities of the World
=> the Kennedys: Their History & Assasinations
=> New York City: Then & Now
-----------------------------
September 11th, 2001
-----------------------------
=> September 11th: Conspiracies, Cover-ups & Remembrance
=> The World Trade Center Remembered
===> Life of the Twin Towers
=> Modern Warfare
=> Environmental Disasters & Mass Tragedies
-----------------------------
Suppressed Knowledge
-----------------------------
=> New World Order
=> Conspiracies
=> Suppressed Knowledge
=> Media Matters
-----------------------------
Politics
-----------------------------
=> the Barack Obama Administration
=> Conservatives, Trump, & Republican Politics
=> Joe Biden, Democratic Politics & News
=> Tea Party, Constitution, Libertarian Parties & Ron Paul
=> Politics & News
-----------------------------
Current Events
-----------------------------
=> Current Events & Odd Stories
=> The World Today
=> Financial News & the Economy
===> The History of Labor
=> Breaking News
-----------------------------
General Category
-----------------------------
=> Opinions & Editorials
=> Cartoons, Humor & Comic Strips
=> Ecology, Pets & the Animal Kingdom
=> General & Miscellaneous
=> Sports
=> Computers & the Internet
-----------------------------
Art, Graphics & Creative Writing
-----------------------------
=> Fantasy Art & Graphics
=> Creative Writing
===> Horror Fiction
=> Poetry
=> Photography & Models
=> Earth Images
-----------------------------
Past Events
-----------------------------
=> Case for Bush Impeachment/War Crimes
===> Bush Administration Torture Scandal
=> Campaign 2008
=> Atlantis Online - Memorial & Biography
===> Atlantis Online - Old Posts
Powered by
EzPortal
Loading...