Effect of climate warming on autumn. A warmer climate before the summer solstice leads to earlier autumn onset, while a warmer climate after the solstice leads to a longer autumn.
Effect of climate warming on autumn. A warmer climate before the summer solstice leads to earlier autumn onset, while a warmer climate after the solstice leads to a longer autumn. Spring keeps getting earlier, but the timing of leaf fall in autumn has been more of a mystery. For the first time, a study helps solve this mystery by revealing the pivotal role of the summer solstice. The research shows that warming before the solstice triggers an earlier onset of leaf senescence, while warming after the solstice slows down the discoloration process. Forests have long been recognized as crucial carbon sinks. However, in temperate and boreal regions, the ability of trees to draw down carbon is constrained by an annual winter pause.
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