Featured Research

from universities, journals, and other organizations

Sea Level On The Rise -- In Real And Virtual Worlds

Date:
February 5, 2007
Source:
CSIRO Australia
Summary:
The climate system, and in particular sea level, may be responding more quickly to rising carbon emissions than climate scientists have estimated with climate models.

CSIRO Marine and Atmospheric Research and Antarctic Climate and Ecosystems CRC scientist, Dr. John Church.
Credit: Image courtesy of CSIRO Australia

The climate system, and in particular sea level, may be responding more quickly to rising carbon emissions than climate scientists have estimated with climate models.

An international team of climate scientists has cautioned against suggestions that the Intergovernmental Panel on Climate Change (IPCC) has previously overestimated the rate of climate change.

The team, from six institutions around the world, reviewed actual observations of carbon dioxide, temperature and sea level from 1990 to 2006 and compared them with projected changes for the same period.

In a review published in the journal Science today, the authors found that carbon dioxide concentration followed the modelled scenarios almost exactly, that global-mean surface temperatures were in the upper part of the range projected by the IPCC, and that observed sea level has been rising faster than the models had projected and closely followed the IPCC Third Assessment Report upper limit of an 88 cm rise between 1990 and 2100.

The scientists noted that because the review period (1990-2006) was short, it would be premature to conclude that sea levels will continue to increase at the same rate in the future. However, they also said their findings show that previous projections have not exaggerated the rate of change but may in some respects have underestimated it.

Measurements of carbon dioxide through facilities such as the Australian Bureau of Meteorology’s Cape Grim observatory in Tasmania support the paper’s conclusions. The global average temperature estimates are collated separately by NASA’s Goddard Institute for Space Studies in the USA and the Hadley Centre and Climatic Research Unit in the UK. The sea level observations come from both coastal and island tide gauges and data provided by satellites.

Sea levels have risen largely due to warming of the ocean and the consequent thermal expansion and melting of non-polar glaciers and ice caps and the ice sheets of Antarctica and Greenland.

One of the authors of the review, Dr John Church of the Antarctic Climate & Ecosystems CRC and CSIRO, noted that any (or all) of the modelled contributions could be underestimated but that there is most uncertainty about the contribution made by ice-sheet melts. “Models of the potential contribution of the Greenland and Antarctic ice sheets need to be improved to include the potential of a relatively dynamic response,” Dr Church said. This work is a component of the Wealth from Oceans Flagship, an initiative of CSIRO to more broadly understand the impact of marine climate change.

Lead author of the review was Dr Stefan Ramstorf, of the Potsdam Institute for Climate Impact Research, Potsdam, Germany; with contributing authors: Dr Anny Cazenave, Toulouse France; Dr John Church, Antarctic Climate and Ecosystem CRC and CSIRO; Dr James Hansen at NASA Goddard Institute for Space Studies, USA; Drs Ralph E. Keeling and Richard C.J. Somerville, Scripps Institution of Oceanography, UCSD, USA; and, Dr David E. Parker, Hadley Centre, Met Office, UK.


Story Source:

The above story is based on materials provided by CSIRO Australia. Note: Materials may be edited for content and length.


Cite This Page:

CSIRO Australia. "Sea Level On The Rise -- In Real And Virtual Worlds." ScienceDaily. ScienceDaily, 5 February 2007. <www.sciencedaily.com/releases/2007/02/070204111703.htm>.
CSIRO Australia. (2007, February 5). Sea Level On The Rise -- In Real And Virtual Worlds. ScienceDaily. Retrieved September 18, 2014 from www.sciencedaily.com/releases/2007/02/070204111703.htm
CSIRO Australia. "Sea Level On The Rise -- In Real And Virtual Worlds." ScienceDaily. www.sciencedaily.com/releases/2007/02/070204111703.htm (accessed September 18, 2014).

Share This



More Earth & Climate News

Thursday, September 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Researchers Explore Shipwrecks Off Calif. Coast

Researchers Explore Shipwrecks Off Calif. Coast

AP (Sep. 16, 2014) Federal researchers are exploring more than a dozen underwater sites where they believe ships sank in the treacherous waters west of San Francisco in the decades following the Gold Rush. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Isolated N. Korea Asks For International Help With Volcano

Isolated N. Korea Asks For International Help With Volcano

Newsy (Sep. 16, 2014) Mount Paektu volcano in North Korea is showing signs of life and there's not much known about it. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins