Traverse City Record-Eagle

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November 24, 2013

Climate change's impact on wine grapes under study

LANSING – Climate change may be the culprit if a sip of favored wine tastes a bit funny.

More extreme weather, like unpredictable springs and long summer droughts, is to blame for changes in grape production, said Erwin "Duke" Elsner a small fruit educator at Michigan State University.

Scientists believe extreme weather is one of the consequences of climate change caused by the burning of fossil fuels. What that means to wine production is as yet unclear, and it’s still too early to tell for certain, Elsner said.

“If we could tell our growers that they could expect consistent warming trends, it would be beneficial, but at this point all we have is a more unpredictable climate. Things continue to change and all we can do is help farmers through as it happens,” Elsner said.

But grapes used to make some white wines, such as Rieslings, depend on consistent temperatures of warm days and cool nights. Inconsistent weather brought on by climate change could cause them to be harvested early, which would change their character, he said.

Winter and summer seasons are key to growing grapes.

“When you drink wine, you are looking for specific characteristics,” said Paolo Sabbatini, an MSU associate professor of horticulture. “When you use grapes for making wine, and if they are not ripe, it is not good and the wine is not distinctive.”

Sabbatini said, “Some grape varieties that we are growing are very sensitive, so if winter tends to be very harsh, they tend to die. The second element is the amount of heat that we receive during the season. Some varieties require a lot of heat.

The Great Lakes region has been getting increasingly warmer, and that’s good for grapes, he said.

Elsner said hot summers aren’t a problem because grapes are tolerant of drought. Temperature increases can be beneficial if they don’t exceed 95 degrees, the point that the grapes start shutting down.

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