About 15 years ago, researchers reported that the timing of spring in high-Arctic Greenland had advanced at some of the fastest rates of change ever seen anywhere in the world. But, according to new evidence reported in the journal Current Biology on July 26, that earlier pattern has since been completely erased. Instead of coming earlier and earlier, it seems the timing of Arctic spring is now driven by tremendous climate variability with drastic differences from one year to the next.
"As scientists we are obliged to revisit previous work to see whether the knowledge obtained at that time still holds," says Niels Martin Schmidt (@NielsMSchmidt) of Aarhus University in Denmark. "We looked at previously reported extreme rates of phenological advancements in the Arctic and found that directional advancement is no longer the prevailing pattern. Actually, the previously observed trend has disappeared completely and has been replaced by extreme year-to-year variation in the onset of spring."
