Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Land-cover changes do not impact glacier loss

06.02.2012
The composition of land surface – such as vegetation type and land use – regulates the interaction of radiation, sensible heat and humidity between the land surface and the atmosphere and, thus, influences ground level climate directly.

For the first time, the Innsbruck climate scientists quantitatively examined whether land-cover changes (LCC) may potentially affect glacier loss. "We used Kilimanjaro in East Africa as a test case, where a significant decrease of forests at elevations between 1,800 and 3,000 meters, caused by illegal deforestation and an increased number of forest fires, has been documented since the 1970s," explains climate researcher Thomas Mölg, who has worked in Berlin since 1 October 2011 but finished the study with his team at the University of Innsbruck.

The glaciers in the Kilimanjaro area have been shrinking for many decades, and climate researchers from Innsbruck and America have conducted thorough glaciological and meteorological measurements for ten years –ideal prerequisites for carrying out a comprehensive study about a potential connection between forest loss and glacier shrinking.

Novel methodology

The prerequisite for conducting this study was a novel methodology that links a glacier and atmospheric model in such a way that no statistical corrections are necessary (published by Kaser/Mölg, 2011 in Journal of Geophysical Research). Direct measurements of various climate elements on Kilimanjaro such as temperature, humidity, radiation, precipitation and glacier mass changes showed that reality can be simulated well by this new methodology. "Based on this evaluation we then modified vegetation cover in the atmospheric model – first showing 1976 and subsequently the current state – and calculated its effect on glacier mass," says Thomas Mölg.

The results show that LCC mainly alter precipitation over glaciers but with different effects on the Northern and Southern ice fields of the mountain (increase or decrease respectively), which results in local increase or decrease of glacier mass. "Depending on the season, LCC contributes not more than seven to 17 % to glacier mass loss in the southern sector. We, therefore, cannot confirm the hypothesis that deforestation at Kilimanjaro contributes significantly to glacier loss," explains Thomas Mölg.

Less precipitation in mid-mountain elevation zones

The results of the study suggest that relatively small-scale land-cover changes, such as on Kilimanjaro, may not have enough impact on the mountain climate to surpass the effects of global climate change on glaciers. "However, another important aspect of the results is that deforestation decreases precipitation significantly more in mid-mountain elevation zones about two kilometers below the glacier than in summit zones". This affects local water reservoirs and reduces water supply for the local population.

Publication:

Mölg/Großhauser/Hemp/Hofer/Marzeion: Limited forcing of glacier loss through land-cover change on Kilimanjaro, Nature Climate Change, published online 5 February 2012

Thomas Mölg | EurekAlert!
Further information:
http://www.uibk.ac.at

More articles from Earth Sciences:

nachricht Sediment from Himalayas may have made 2004 Indian Ocean earthquake more severe
26.05.2017 | Oregon State University

nachricht Devils Hole: Ancient Traces of Climate History
24.05.2017 | Universität Innsbruck

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>