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




WATER WORLD
Century-long trend of global ocean warming identified
by Staff Writers
Washington DC (SPX) Oct 30, 2012


File image.

One of the largest sources of uncertainty in reconstructing the warming of the past century stems from problems with historical ocean temperature records. Inconsistencies in method or technology or gaps in observation caused by two world wars mean that long-term records of sea temperature need to be interpreted with care.

Drawing on two historical sets of ocean temperature observations - one of the sea surface and the other of the upper 20 meters (66 feet) - Gouretski et al. find that the 20th century saw a long-term trend of ocean warming. The two data sets were mostly collected independently, using different tools and techniques, and were subjected to different post processing.

The authors suggest that, owing to the distinct ways in which the data were gathered, the presence of a similar trend could mean that it is not a spurious finding.

Before the middle of the twentieth century, sea temperatures were predominantly measured from water collected in ships' engine rooms.

At the end of World War II, bucket-collected water became the tool of choice, a shift that caused a sharp dip in measured temperatures. Instrumental biases from subsequent (and earlier) shifts in technology were accounted for to varying degrees.

Drawing from a number of databases, the authors compiled more than 7 million subsurface temperature profiles, together with 244 million sea surface temperature measurements from the International Comprehensive Ocean Atmosphere Data Set, representing observations back to 1900.

The authors find that sea surface and upper 20 meters (66 feet) temperatures generally tracked each other throughout the study period, though surface temperatures were higher than those of the subsurface. Both records show warming from 1900 to 1945, a decrease until the mid-1970s, and then a return to warming.

Additionally, the authors find that, on average, the upper 400 meters (1,312 feet) of the ocean warmed by 0.5 degrees Celsius (0.9 degrees Fahrenheit) to 0.6 degrees Celsius (1 degree Fahrenheit) from 1900 to 2000.

"Consistent near-surface ocean warming since 1900 in two largely independent observing networks" Geophysical Research Letters, doi:10.1029/2012GL052975, 2012

.


Related Links
American Geophysical Union
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
La Nina Caused Global Sea Level Drop
Washington DC (SPX) Oct 30, 2012
The 2011 La Nina was so strong that it caused global mean sea level to drop by 5 millimeters (0.2 inches), a new study shows. Since the early 1990s, sea level has been rising by about 3 millimeters (0.1 inches) per year, satellite data show. But between the beginning of 2010 and the middle of 2011, sea level fell by 5 millimeters (0.2 inches). This occurred concurrently with the La Nina ph ... read more


WATER WORLD
Storm leaves billions in damage across eastern US

Atlantic City bar faces hurricane with a drink

Obama races back to White House as hurricane threatens

Asia's mega-cities badly exposed to superstorms

WATER WORLD
Russian chemists land on the island of stability

Head of iPhone software out in Apple shakeup

Safety glass - cut to any shape

Cost-effective titanium forming

WATER WORLD
Century-long trend of global ocean warming identified

Global precipitation variability decreased from 1940 to 2009

La Nina Caused Global Sea Level Drop

Uncertainty of future South Pacific Island rainfall explained

WATER WORLD
Polar bears seen taking refuge on icebergs

Biologists record increasing amounts of plastic litter in the Arctic deep sea

Opposite Behaviors? Arctic Sea Ice Shrinks, Antarctic Grows

Italian snow levels, glaciers retreating

WATER WORLD
Greater effort needed to move local, fresh foods beyond 'privileged' consumers

Minimizing Mining Damage with Manure

Gaps in border controls are related to alien insect invasions in Europe

Black rice and tea in Italy as China shows its green side

WATER WORLD
Earthquake shakes buildings in Philippine capital

Storm-battered US battles floods, power cuts

Sandy leaves death, darkness and destruction

Deadly storm floods and blacks out Manhattan

WATER WORLD
Senegal foreign, interior ministers lose jobs in reshuffle

G.Bissau's alleged coup mastermind to face military court

Rwanda ex-army chief's refugee status questioned in S.Africa

Making transport a driver for development in Africa

WATER WORLD
Genetics suggest global human expansion

'Digital eternity' beckons as death goes high-tech

Primates' brains make visual maps using triangular grids

Lucy and Selam's species climbed trees




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