Observational evidence from two mountainous regions that near-surface wind speeds are declining more rapidly at higher elevations than lower elevations: 1960-2006

Details Observational evidence from two mountainous regions that near-surface wind speeds are declining more rapidly at higher elevations than lower elevations: 1960-2006 Observational evidence from two mountainous regions that near-surface wind speeds are declining more rapidly at higher elevations than lower elevations: 1960-2006

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3706402m&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 6, CiteID L06402

Physics

8

Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Global Change: Regional Climate Change, Global Change: Climate Dynamics (0429, 3309), Hydrology: Evapotranspiration, Hydrology: Water Supply

Scientific paper

Coupling recent observed declines of terrestrial mid-latitude near-surface wind speed (u) with knowledge that high-elevation sites rapidly experience climate change led to an assessment of the regional near-surface elevation dependence of u (uZ) at two mountainous regions (central China and Switzerland). The monthly uZ were calculated from 1960-2006. In both regions uZ were higher in winter (˜2.25 m s-1 km-1) compared to summer (˜1.25 m s-1 km-1). For the first time uZ trends were calculated, the results were strongly seasonal, ranging from ˜-0.025 m s-1 km-1 a-1 in winter to ˜-0.005 m s-1 km-1 a-1 in summer. For both regions uZ trend results showed that u has declined more rapidly at higher than lower elevations, even though different u dynamics were observed. The uZ trends have important implications for climatic changes of coupled land-surface/boundary-layer processes (such as evapotranspiration) at high-elevation regions where much of the globe's fresh water is derived.

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