'There’s a good chance that if you’re a sufferer of seasonal allergies and live in the eastern two-thirds of the U.S., you’re already feeling the effects of an early bloom.' ( via grist )
Spring has sprung unusually early in the eastern United States. From parts of the Gulf Coast all the way up through southern New England, leaves are popping out of shrubs and trees days or even weeks. Some areas are experiencing their earliest spring on record, which means communities are also enduring an unusually early allergy season. Experts say rising temperatures, among the most visceral consequences of unfettered fossil fuel combustion, play a role in this year’s accelerated spring.
Phenologists — people who study biological life cycles — use two metrics to delineate the change in seasons: First bloom, when plants begin to flower, and first leaf-out, when leaves unfurl. This year, first bloom and first leaf-out started creeping up the East Coast between three and four weeks ahead of schedule. That’s not entirely unusual; natural variation in seasons results in an early spring every few years.
Parts of central Texas and the Louisiana coast, southern Arkansas, southern Ohio, the D.C. area, New York City, and the New Jersey coastline all clocked their earliest spring on record, said Theresa Crimmins, director of the National Phenology Network, a group that collects data on seasons and other natural cycles.
in the eastern U.S., plus a string of very warm days in recent weeks, created ideal conditions for an early-onset spring. “That’s really what caused things to get so far ahead of schedule,” Crimmins said. It’s tough to peg climate change to a particular early leaf-out in any one place, but evidence of anthropogenic warming is obvious in how the timing of seasons in the U.S.. “There is a clear underlying trend over the long term toward progressively earlier starts to the spring season in much of the country, much of the eastern U.S. in particular,” Crimmins said. “That is the result of steadily increasing global average temperatures.
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