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Orographic Precipitation and Climate Change

  • Christoph Schär
  • Christoph Frei
Part of the Advances in Global Change Research book series (AGLO, volume 23)

Abstract

More than half of the accessible freshwater is used directly or indirectly by humankind, and much of this precious resource has its origin in mountainous regions, ultimately in the form of orographic precipitation. In many areas, mountains function as “water towers” for the surrounding regions. Melt from snow cover and glaciers represents an important contribution to runoff in the surrounding areas, especially during seasons when precipitation is sparse or completely absent. Mountain freshwater resources are heavily utilized for agricultural purposes (e.g. irrigation) and for the generation of hydropower, thus being of great socio-economic importance. Yet, heavy orographic precipitation events also represent a potential hazard, as they may lead to floods, avalanches and mudslides that often cause countless loss of life and tremendous damage. The potential consequences of such events may be extreme. For instance, a single catastrophic mudslide event that took place in Venezuela on December 15, 1999, is estimated to have caused more than 20,000 casualties according to re-insurance estimates.

Keywords

Climate change Climate models Extreme events Precipitation Runoff Scenarios 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Christoph Schär
    • 1
  • Christoph Frei
    • 1
  1. 1.Institute for Atmospheric and Climate Science, Swiss Federal Institute of TechnologyETH ZurichZurichSwitzerland

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