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Kimberly Nicholas

Kimberly Nicholas

Senior Lecturer, Docent

Kimberly Nicholas

A 4-week advance in the growing season in Napa Valley, California, USA

Author

  • Daniel R. Cayan
  • Laurel DeHaan
  • Mary Tyree
  • Kimberly A. Nicholas

Summary, in English

The growing season start and duration, along with other temperature-related measures of importance to premium wine grapes in Napa Valley, California have changed as climate over the western United States has warmed. The growing season start has varied from year to year with a standard deviation of about 3 weeks, but over the 1958–2016 record a linear fit to the time sequence shows it advanced by more than 4 weeks. Over the study period, advances in the growing season were strongly influenced by temperature increases beginning in the late 1960s with warm anomalies generally persisting through recent years. The date upon which the growing season accumulated 1400 growing degree-days also shifted earlier by about 4 weeks. Other measures swung to a warmer status, including the mean temperature of the last 45 days of the growing season, which warmed by over 1.5°C. Warming days and especially warming nights contributed to the growing season advance as well as trends towards warmer expressions of other viticultural measures. Years with earlier and warmer growing seasons experienced a substantial reduction in the number of daily cool extremes, and an increase in daily warm extremes, including the number of days whose temperature reaches or exceeds 35°C.

Department/s

  • LU Profile Area: Nature-based future solutions
  • LUCSUS (Lund University Centre for Sustainability Studies)
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publishing year

2023

Language

English

Pages

5586-5603

Publication/Series

International Journal of Climatology

Volume

43

Issue

12

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Climate Research

Keywords

  • California
  • climate change
  • climate variation
  • growing season
  • Napa Valley
  • phenology
  • temperature
  • viticulture

Status

Published

ISBN/ISSN/Other

  • ISSN: 0899-8418