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Climatic Change

, Volume 59, Issue 1–2, pp 33–52 | Cite as

Variability of Freezing Levels, Melting Season Indicators, and Snow Cover for Selected High-Elevation and Continental Regions in the Last 50 Years

  • Henry F. Diaz
  • Jon K. Eischeid
  • Chris Duncan
  • Raymond S. Bradley
Article

Abstract

We have used NCEP/NCAR Reanalysis data and a Northern Hemisphere snow cover data set to analyze changes in freezing level heights and snow cover for the past three to five decades. All the major continental mountain chains exhibit upward shifts in the height of the freezing level surface. The pattern of these changes is generally consistent with changes in snow cover, both over the course of the year and spatially. We examined different free-air temperature parameters (dry bulb temperature, virtual temperature, and 700–500 hPa thickness) using the Reanalysis grid point valueslocated over the different mountain areas as defined in this study. The different trend values were in reasonably good agreement with each other, particularly over the second half of the record.Freezing level changes in the American Cordillera are strongly modulated by the El Niño/Southern Oscillation (ENSO) phenomenon and the freezing level heights (FLH) respond to both interannual and decadal-scale change in tropical Pacific sea surface temperature (SST). The ∼ 0.5 °C increase in SST recorded in the tropical Pacific since the 1950s accounts for approximately half of the increase in FLH in tropical and subtropical latitudes of the Cordilleran region during that same time.

Keywords

Snow Cover Subtropical Latitude Freezing Level Snow Cover Data Season Indicator 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Henry F. Diaz
    • 1
  • Jon K. Eischeid
    • 2
  • Chris Duncan
    • 3
  • Raymond S. Bradley
    • 3
  1. 1.U.S.A.
  2. 2.University of Colorado, BoulderU.S.A
  3. 3.Department of GeosciencesUniversity of Massachusetts, AmherstU.S.A

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