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Does global warming decrease the correlation between cherry blossom flowering date and latitude in Japan?

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This summary is machine-generated.

Global warming is altering cherry blossom flowering times in Japan. Mild winters may delay the first date of flowering (FFD), weakening the link between FFD and latitude.

Keywords:
CherryFlowering phenologyHorizontal gradientJapanLinearity

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Area of Science:

  • Phenology
  • Climate Change Research
  • Botany

Background:

  • The first date of flowering (FFD) for Yoshino cherry trees (Cerasus ×yedoensis) typically follows a northward latitudinal gradient in Japan.
  • Unusual mild winter and spring temperatures in 2020 resulted in an atypical FFD geographical distribution.
  • A hypothesis was formed suggesting global warming impacts the average geographical pattern of FFD.

Purpose of the Study:

  • To investigate the long-term relationship between latitude and the FFD of cherry trees in Japan.
  • To determine if global warming has altered the traditional geographical progression of cherry blossoms.
  • To analyze changes in the correlation between FFD and latitude over several decades.

Main Methods:

  • Analysis of observed FFD data from 42 sites across Japan.
  • Statistical examination of the relationship between FFD and latitude from 1953 to 2020.
  • Correlation analysis to identify trends in FFD geographical distribution over time.

Main Results:

  • A significant decrease in the correlation between FFD and latitude was observed after 1980.
  • Mild winter temperatures appear to delay dormancy release and subsequent FFD, particularly in warmer regions.
  • The geographical pattern of cherry blossom FFD is diverging from the expected latitudinal gradient.

Conclusions:

  • Global warming is influencing the phenology of cherry blossoms in Japan.
  • Rising winter temperatures may be a key factor in the observed changes to FFD patterns.
  • Future climate warming is predicted to further decrease the correlation between FFD and latitude, altering traditional spring observations.