Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




SHAKE AND BLOW
Tropical cyclones are occurring more frequently than before
by Staff Writers
Copenhagen, Denmark (SPX) Oct 16, 2012


Storm surges are considered to be the most dangerous and the most destructive aspect of tropical cyclones. The study shows that globally warm years has been associated with a significantly higher risk of extreme hurricane storm surges like the one that followed Katrina, which hit the New Orleans area in 2005 and caused devastating floods and thousands of deaths. Credit: Credit: LCDR Mark Moran, NOAA Corps, NMAO/AOC.

Are there more tropical cyclones now than in the past? - or is it just something we believe because we now hear more about them through media coverage and are better able detect them with satellites?

New research from the Niels Bohr Institute clearly shows that there is an increasing tendency for cyclones when the climate is warmer, as it has been in recent years. The results are published in the scientific journal PNAS.

How can you examine the frequency of tropical cyclones throughout history when they have not been systematically registered? Today cyclones are monitored from satellites and you can follow their progress and direction very accurately. But it is only the last approx. 40 years that we have been able to do this.

Previously, they used observations from ships and aircraft, but these were not systematic measurements. In order to get a long-term view of the frequency of cyclones, it is necessary to go further back in time and use a uniform reference.

Climate scientist Aslak Grinsted of the Centre for Ice and Climate at the Niels Bohr Institute at the University of Copenhagen therefore wanted to find some instruments that have stood and registered measurements continuously over a long period of time.

Correlation between sea levels and cyclones
"Tropical cyclones typically form out in the Atlantic Ocean and move towards the U.S. East Coast and the Gulf of Mexico.

"I found that there were monitoring stations along the Eastern Seaboard of the United States where they had recorded the daily tide levels all the way back to 1923.

"I have looked at every time there was a rapid change in sea level and I could see that there was a close correlation between sudden changes in sea level and historical accounts of tropical storms," explains Aslak Grinsted.

Aslak Grinsted now had a tool to create statistics on the frequency of cyclones that make landfall - all the way back to 1923. He could see that there has been an increasing trend in the number of major storm surges since 1923.

Correlation between cyclones and climate
Together with colleagues in China and England, he then looked at the global temperatures over the period to see whether there was a trend for a higher frequency of cyclones in a warmer climate.

The global temperature has increased 0.7 degrees C since 1923, but there are variations. For example, there was a warm period in the 1940s but the temperature has really risen since 1980.

"We simply counted how many extreme cyclones with storm surges there were in warm years compared to cold years and we could see that there was a tendency for more cyclones in warmer years," says Aslak Grinsted.

But not all cyclones are equally harmful and those with the highest storm surges tend to cause the most damage. Cyclones with a strength like Katrina, which hit the New Orleans area in 2005 and caused devastating floods and thousands of deaths, make landfall every 10-30 years on average.

"We have calculated that extreme hurricane surges like Katrina are twice as likely in warm years than in cold years. So when the global climate becomes 3 degrees warmer in the future, as predictions show, what happens then?," reflects Aslak Grinsted.

.


Related Links
University of Copenhagen
Bringing Order To A World Of Disasters
When the Earth Quakes
A world of storm and tempest






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





SHAKE AND BLOW
New hurricane forms over Pacific
Miami (AFP) Oct 15, 2012
A new hurricane has formed over the Pacific off Mexico, prompting local officials to issue a tropical storm watch for parts of Baja California state, US forecasters said Monday. The hurricane, named Paul, packed maximum sustained winds of nearly 75 miles (120 kilometers) an hour, with stronger gusts, the Miami-based National Hurricane Center said. But the storm was expected to start weak ... read more


SHAKE AND BLOW
University of Tennessee study confirms solar wind as source for moon water

Russia to launch lunar mission in 2015

Moon water could have solar source: study

Solar wind particles likely source of water locked inside lunar soils

SHAKE AND BLOW
NMSU Graduate Student Looks For Indications Of Life On Mars In Possible Trace Methane Gas

Rover's Second Scoop Discarded, Third Scoop Commanded

Robotic Arm Tools Get To Work On Rock Outcrop

Curiosity Preparing for Second Scoop

SHAKE AND BLOW
Austrian space diver no stranger to danger

Baumgartner feat boosts hopes for imperilled astronauts

Austrian breaks sound barrier in record space jump

Austrian daredevil to make new space jump bid

SHAKE AND BLOW
China launches civilian technology satellites

ChangE-2 Mission To Lagrange L2 Point

Meeting of heads of ESA and China Manned Space Agency

China Spacesat gets 18-million-USD gov't support

SHAKE AND BLOW
Crew Unloads Dragon, Finds Treats

Station Crew Opens Dragon Hatch

NASA and International Partners Approve Year Long ISS Stay

Year on ISS planned ahead of manned Mars mission

SHAKE AND BLOW
AFSPC commander convenes AIB

Proton Lofts Intelsat 23 For Americas, Europe and Africa Markets

India to launch 58 space missions in next 5 years

SpaceX Dragon Successfully Attaches To Space Station

SHAKE AND BLOW
Ultra-Compact Planetary System Is A Touchstone For Understanding New Planet Population

Nearest Star Has Earth Mass Planet

Distant planet found circling with 4 stars

Nearby Super-Earth Likely a Diamond Planet

SHAKE AND BLOW
ESA deploys first orbital debris test radar in Spain

Boeing Proposes Gas Clouds to Remove Space Debris

Microsoft to price new tablet near same as iPad

UNH scientists provide window on space radiation hazards




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal 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