Archive | March 2016

French wines could come out ahead among winners and losers from climate change

Climate change creates both winners and losers in ecosystems. It could be disastrous for some species, shrinking their range or leading to the end of some isolated populations of plants or animals. But one upside could be better French wines.

(c) Kathiann M. Kowalski

(c) Kathiann M. Kowalski

In a study published last week, Elizabeth Wolkovich at Harvard University and Benjamin Cook at Columbia University and NASA’s Goddard Institute for Space Studies examined long-term records on French winegrape harvests. “I’m mostly a climate scientist and Lizzie is primarily an ecologist studying plants,” says Cook. “So this particular study was a great way to combine our two disciplines into a really interesting study.”

“I personally became interested in winegrapes since I study phenology,” says Wolkovich. That area of science deals with “the timing of plant and animal events that recur each year, such as leafout or flowering,” she explains. A grape isn’t just a grape, either. “Different varieties (e.g., Pinot Noir versus Cabernet Sauvignon) have incredibly different phenologies and winegrapes have tremendously long records — so both these features drew me to studying winegrapes.”

Those tremendously long records go back more than 300 years, to the 1600s. Those records provided the researchers with lots of data. Also, because climate change takes place over time, the records let the team see how the harvests meshed with different climate trends.

As a general rule, the earlier the harvest was in a particular year, the better the wine would be. For the most part, those early harvests tended to happen in years that were both warm and dry.

Until recently.

Warming trends seem to have broken that link between warmth and low rainfall as a condition for early harvests, the researchers found. That finding was a surprise.

“We are seeing a change in the way drought affects the harvest,” Cook explains. ”Before 1981, you need a hot dry summer to get an early harvest. After, thanks to global warming, you can get hot enough for an early harvest even without a drought.” The team published their research online on March 21 in Nature Climate Change.

So far, the change seems to be good for producing fine French wines. However, there’s no guarantee that the trend will continue. At some point, for example, too much moisture could conceivably affect the vines or the quality of their grapes. Similarly, even if climate change seems to be good for wine grapes in one region, a 2013 study in the Proceedings of the National Academy of Sciences suggests that other wine regions could well suffer as the ecological balance of their area shifts.

Nor does the study mean that climate change is not a problem. Hosts of other studies forecast widespread ecological harm, health consequences and other impacts.

Nonetheless, we can all appreciate and toast good science. And there’s nothing wrong with enjoying a glass of fine wine.

“For white, I’m partial to a nice dry riesling,” Cook says. “For red, I like a peppery cabernet franc.”

“Dry rieslings are great!” says Wolkovich. “I also like red blends, especially ones with interesting varieties.”

ADDENDUM:
A new study published on April 1, 2016, found that climate change could also boost wine production across the English Channel in the United Kingdom, BUT–and you know there would be a BUT, right–there would likely be more susceptibility to weather shocks.
In other words, grape production could grow, but there would also be significant threats from increases in extreme weather events, such as frosts after bud-burst or extra heavy rainfall.
The team at the University of East Anglia writes about its work in the Australian Journal of Grape and Wine Research.