Figure : leaf-and-bloom-index

Trends in First Leaf and First Bloom Dates

Figure 7.3

U.S. Geological Survey
Jake F. Weltzin

This figure appears in chapter 7 of the Impacts, Risks, and Adaptation in the United States: The Fourth National Climate Assessment, Volume II report.

These maps show observed changes in timing of the start of spring over the period 1981–2010, as represented by (top) an index of first leaf date (the average date when leaves first appear on three indicator plants) and (bottom) an index of first bloom date (the average date when blossoms first appear on three indicator plants). Reds and yellows indicate negative values (a trend toward earlier dates of first leaf or bloom); blues denote positive values (a trend toward later dates). Units are days per decade. Indices are derived from models driven by daily minimum and maximum temperature throughout the early portion of the growing season. Source: adapted from Ault et al. 2015.3307a62c-ed45-4399-bcb9-f77e71b1e626

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This figure was created on March 13, 2018.

This figure was submitted on November 30, 2018.

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