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Historical trends in the jet streams Cristina L. Archer1

Summary: Historical trends in the jet streams
Cristina L. Archer1
and Ken Caldeira1
Received 12 February 2008; revised 10 March 2008; accepted 14 March 2008; published 18 April 2008.
[1] Jet streams, the meandering bands of fast winds located
near the tropopause, are driving factors for weather in the
midlatitudes. This is the first study to analyze historical
trends of jet stream properties based on the ERA-40 and the
NCEP/NCAR reanalysis datasets for the period 1979 to
2001. We defined jet stream properties based on mass and
mass-flux weighted averages. We found that, in general, the
jet streams have risen in altitude and moved poleward in
both hemispheres. In the northern hemisphere, the jet stream
weakened. In the southern hemisphere, the sub-tropical jet
weakened, whereas the polar jet strengthened. Exceptions to
this general behavior were found locally and seasonally.
Further observations and analysis are needed to confidently
attribute the causes of these changes to anthropogenic
climate change, natural variability, or some combination of
the two. Citation: Archer, C. L., and K. Caldeira (2008),


Source: Archer, Cristina Lozej - Department of Civil and Environmental Engineering, Stanford University


Collections: Geosciences; Renewable Energy