Autumn colors leaves8/22/2023 ![]() According to the National Oceanic and Atmospheric Administration (NOAA) monthly US climate report, in 2022, “the average October temperature across the contiguous U.S. The eight warmest Octobers on record were experienced in the Northern Hemisphere between 2014 to 2021. Do Warmer Autumns Mean Shorter Fall Foliage Seasons? This is why certain broad-leaved trees remain green year round in the southern states, where temperatures are warmer throughout the fall and winter. The red and purple leaves, caused by other chemical processes, are also prompted by colder weather and shorter days. The yellow, orange, and gold colors of autumn leaves are then visible in all their glory. The green color fades as chlorophyll in the leaves breaks down. Less sunlight triggers the breakdown of chlorophyll in leaves, which is not replenished by the plant as the season progresses. In autumn, as the weather cools, the leaves start to receive less sunlight. Yellow and orange pigments are also present, but they are hidden by the intense green color. During the spring and summer, chlorophyll is regenerated as a result of certain chemical processes that occur with warmer weather and longer exposure to sunlight.ĭuring the spring-summer period, trees maintain high levels of chlorophyll causing the leaves to remain green. Chlorophyll in leaves absorb light from the sun, crucially capturing the energy needed for the photosynthesis process, whereby trees and plants manufacture the food (carbohydrates and sugars) that they need to live and grow. On a basic level, the leaves of a plant appear green because of a green pigment called chlorophyll. Is it possible that autumn leaves will become a thing of the past? Understanding the Colors of Autumn Leaves ![]() Unfortunately, environmental factors like air quality, droughts, and climate change could change all of that. In fact, stunning colors of autumn leaves drive a huge tourism industry from Vermont to the Carolinas. When we think of autumn, our mind is usually filled with the brilliant red, orange, gold, and yellow leaves of the trees. ![]()
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