Forum für Wissenschaft, Industrie und Wirtschaft

Hauptsponsoren:     3M 
Datenbankrecherche:

 

Melting Glaciers Raise Sea Level

14.11.2012
Anthropogenic climate change leads to melting glaciers and rising sea level.
Between 1902 and 2009, melting glaciers contributed 11 cm to sea level rise. They were therefore the most important cause of sea level rise. This is the result of a new assessment by scientists of the University of Innsbruck. They numerically modeled the changes of each of the world’s 300 000 glaciers. Until 2100, glaciers could lead to an additional 22 cm of sea level rise.

Since 1900 the global sea level has risen by approximately 20 cm. Melting glaciers are one of the causes – along with warming and thereby expanding sea water, melting Greenland and Antarctic ice sheets, and changing terrestrial water storage in dammed lakes and groundwater reservoirs.

Until 2300, we can expect the sea level to rise between 25 and 42 cm due to glacier melt. With 42 cm sea level rise, most of the glaciers of the world will be gone, leaving behind only small remains in very high altitudes.

Ben Marzeion

A team of scientists at the University of Innsbruck has now assessed the contribution of melting glaciers to sea level rise during the 20th century. They numerically modeled each of the world’s roughly 300 000 glaciers and used thousands of on-site measurements to validate the model results.

“These calculations show that between 1902 and 2009, glaciers contributed about 11 cm to sea level rise”, says Dr. Ben Marzeion from the Institute for Meteorology and Geophysics. “This means they were the most important cause of sea level change.” Surprisingly, melt rates were more or less constant over time: While temperatures during the first decades of the 20th century were considerably lower, glaciers were larger and extended into lower and thus warmer areas. Additionally, brief but strong warm episodes in the Arctic led to strong glacier retreat in the Arctic in the 1930s and 1950s.

Alps will lose half of the ice until 2040

Using 15 different climate models, the Innsbruck scientists also investigated the future fate of the glaciers. “There are big regional differences”, says Dr. Marzeion. “Also the future behavior of humankind is important – i.e., how much carbon dioxide and other greenhouse gases will be emitted.”

In the climate models four different scenarios of future economic, social, and technological development were used to represent different levels of greenhouse gas emissions. “Regions with small glaciers, such as the Alps, will lose a large fraction of their ice during the coming decades”, explains the climate scientist. “In the Alps, half of the ice will be gone by approximately 2040. But in absolute numbers, this loss is relatively small: until then, the Alps will contribute only 0.2 mm to sea level rise.”

Regions with large glaciers, however, will lose a lot of mass in absolute numbers, while a relatively large fraction remains: “In the Canadian Arctic about 70% of the ice will remain in 2100, but this region alone will have contributed about 2 cm to sea level rise by then”, says Ben Marzeion.

Stronger sea level rise ahead

Melting glaciers will raise the sea level between 15 and 22 cm until 2100. “Where we end up within this range is up to us – it mostly depends on how much greenhouse gas we will emit”, says Marzeion. The same is true for the longer term: “Until 2300, we can expect the sea level to rise between 25 and 42 cm due to glacier melt. With 42 cm sea level rise, most of the glaciers of the world will be gone, leaving behind only small remains in very high altitudes.” But also in the future, warming and thus expanding sea water, melting of the Greenland and Antarctic ice sheets, and changing terrestrial water storage have to be added to obtain the full sea level rise.

Reference: Past and future sea-level change from the surface mass balance of glaciers. B. Marzeion, A. H. Jarosch, and M. Hofer. The Cryosphere, 6, 1295-1322, 2012 DOI:10.5194/tc-6-1295-2012 http://dx.doi.org/10.5194/tc-6-1295-2012

Contact:
Ben Marzeion
Institute of Meteorology and Geophysics
University of Innsbruck
Tel.: +43 512 507-5482
E-Mail: ben.marzeion@uibk.ac.at

Christian Flatz
Public Relations
University of Innsbruck
Tel.: +43 512 507-32022
Mobil: +43 676 872532022
E-Mail: christian.flatz@uibk.ac.at

Dr. Christian Flatz | Universität Innsbruck
Further information:
http://dx.doi.org/10.5194/tc-6-1295-2012
http://www.uibk.ac.at

More articles from Earth Sciences:

nachricht NASA sees heavy rain in Tropical Cyclone Chan-Hom
02.07.2015 | NASA/Goddard Space Flight Center

nachricht Creating a stopwatch for volcanic eruptions
02.07.2015 | Arizona State University

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Forschungsschiff Heincke seit 25 Jahren im Dienst der Wissenschaft

Ein Vierteljahrhundert alt, über 900.000 Kilometer (488.842 nautische Meilen) gefahren und trotzdem auf dem neuesten wissenschaftlichen und technischen Stand: Die Indienststellung des Forschungsschiffes Heincke jährt sich am 8. Juli 2015 zum 25. Mal.

Wissenschaftler des Alfred-Wegener-Instituts, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), das die Heincke betreibt, nehmen ebenso regelmäßig an...

Im Focus: Solardächer produzieren Strom für Fahrzeuge

Studentische Industriekooperation zwischen HAW Hamburg und Webasto erarbeitet Ergebnisse für EU-Zertifizierungsprozess von Solardächern zur Verbesserung der Öko-Bilanz von Fahrzeugen.

Unter der Leitung von Dr.-Ing. Volker Skwarek, Professor für technische Informatik an der HAW Hamburg, erarbeiteten sechs Studierende des...

Im Focus: Viaducts with wind turbines, the new renewable energy source

Wind turbines could be installed under some of the biggest bridges on the road network to produce electricity. So it is confirmed by calculations carried out by a European researchers team, that have taken a viaduct in the Canary Islands as a reference. This concept could be applied in heavily built-up territories or natural areas with new constructions limitations.

The Juncal Viaduct, in Gran Canaria, has served as a reference for Spanish and British researchers to verify that the wind blowing between the pillars on this...

Im Focus: Aus alt mach neu - Rohstoffquelle Elektroschrott

Der Markt für Unterhaltungselektronik boomt: Rund 60 Millionen Fernsehgeräte wurden im letzten Jahr in Europa verkauft. Früher oder später werden sie zurückkehren – als Elektroschrott.

Die Recycling-Industrie hat darauf reagiert: Kupfer, Aluminium, Eisen- und Edelmetalle sowie ausgewählte Kunststoffe werden bereits wiederverwertet. Allerdings...

Im Focus: Radar schützt vor Weltraummüll

Die Bedrohung im All durch Weltraummüll ist groß. Aktive Satelliten und Raumfahrzeuge können beschädigt oder zerstört werden. Ein neues, nationales Weltraumüberwachungssystem soll ab 2018 vor Gefahren im Orbit schützen. Fraunhofer-Forscher entwickeln das Radar im Auftrag des DLR Raumfahrtmanagement.

Die »Verkehrssituation« im All ist angespannt: Neben unzähligen Satelliten umkreisen Weltraumtrümmer wie beispielsweise ausgebrannte Raketenstufen und...

Alle Focus-News des Innovations-reports >>>

Anzeige

Anzeige

IHR
JOB & KARRIERE
SERVICE
im innovations-report
in Kooperation mit academics
Veranstaltungen

Flurförderzeuge im Zeichen der Zeit

03.07.2015 | Veranstaltungen

Aktuelles aus Forschung und Betrieb: 27. Deutscher Flammentag

02.07.2015 | Veranstaltungen

Call for ideas: Gute Ideen für bessere Städte

02.07.2015 | Veranstaltungen

 
B2B-VideoLinks
Weitere VideoLinks >>>
Aktuelle Beiträge

Siemens erhält Auftrag für Offshore-Windkraftwerk in Großbritannien

03.07.2015 | Unternehmensmeldung

Flurförderzeuge im Zeichen der Zeit

03.07.2015 | Veranstaltungsnachrichten

Kompakter Time Converter für zuverlässigen Einsatz in rauen Umgebungen

03.07.2015 | Energie und Elektrotechnik