SAN FRANCISCO -- On a remote island in the Bering Strait during World War II, a tiny band of Americans ran a radar station. Twenty-nine reindeer were placed on St. Matthew Island with them, to be eaten in case of emergency.
The emergency never came, and population biologist Dave Klein counted 6,000 reindeer on the island by 1963, spread out over just 50 square miles of land. Then, sailors started to report seeing bleached reindeer skeletons dotting the island. When Klein returned in 1966, there were only 42 left and no males with the ability to reproduce. The herd dwindled and eventually went extinct.
There this strange mystery sat for decades until extreme weather specialist John Walsh of the University of Alaska-Fairbanks and University of Nebraska climatologist Martha Shulski teamed up with the now 80-year-old Klein to solve it. They announced their findings this week here at the American Geophysical Union meeting.
It turns out that a series of winter cyclones comparable in intensity to a Category 2 hurricane buffeted the island in early 1964. Overpopulated and isolated as the island was, the reindeer herd proved vulnerable to the extreme storms, which brought much heavier than normal snowfall, stronger winds, and lower temperatures.
The question that remains is why these extra-strong storms occurred. For reasons that still aren't understood, a series of weather systems sweeping across the Pacific from Japan intensified just east of the dateline and then headed north.
Over that winter, the closest weather station to reindeer's home, St. Paul Island, got more than six and a half feet more snow than normal. The barometric pressure differential between the low of the strongest storm and the regional high in Siberia was the highest in the 60-year period for which measurements are available. The reindeer were no match.
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- A New Explanation for Ancient Mass Extinction
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