Identification of external influences on temperatures in California Metadata

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Title

  • Main Title Identification of external influences on temperatures in California

Creator

  • Author: Bonfils, C
    Creator Type: Personal
  • Author: Duffy, P
    Creator Type: Personal
  • Author: Santer, B
    Creator Type: Personal
  • Author: Wigley, T
    Creator Type: Personal
  • Author: Lobell, D
    Creator Type: Personal
  • Author: Phillips, T
    Creator Type: Personal
  • Author: Doutriaux, C
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: Livermore, California
    Additional Info: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Date

  • Creation: 2006-06-01

Language

  • English

Description

  • Content Description: We use eight different observational datasets to estimate California-average temperature trends over 1950-1999. Observed results are compared to trends from a suite of control simulations of natural internal climate variability. Observed increases in annual-mean surface temperature are distinguishable from climate noise in some but not all observational datasets. The most robust results are large positive trends in mean and maximum daily temperatures in late winter/early spring, as well as increases in minimum daily temperatures from January to September. These trends are inconsistent with model-based estimates of natural internal climate variability, and thus require one or more external forcing agents to be explained. Our results suggest that the warming of Californian winters over the second half of the twentieth century is associated with human-induced changes in large-scale atmospheric circulation. We also hypothesize that the lack of a detectable increase in summertime maximum temperature arises from a cooling associated with large-scale irrigation. This cooling may have, until now, counteracted the warming induced by increasing greenhouse gases and urbanization effects.
  • Physical Description: PDF-file: 15 pages; size: 0.7 Mbytes

Subject

  • Keyword: Irrigation
  • Keyword: Greenhouse Gases
  • STI Subject Categories: 58 Geosciences
  • Keyword: Atmospheric Circulation
  • Keyword: California
  • Keyword: Climates
  • STI Subject Categories: 54 Environmental Sciences

Source

  • Journal Name: Climatic Change, vol. 87, Supplem 1, December 19, 2007, pp. 43-55; Journal Volume: 87; Journal Issue: 1

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: UCRL-JRNL-221904
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936700
  • Archival Resource Key: ark:/67531/metadc893286
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