French vineyards like the one in the photograph are experiencing earlier harvests in recent years as the region's climate has warmed.Photo Courtesy of: Elizabeth Wolkovich/Harvard University
A new study from NASA and Harvard University finds that climate change is diminishing an important link between droughts and the timing of wine grape harvests in France and Switzerland.
Lab Management Certificate
The Lab Management certificate is more than training—it’s a professional advantage.
Gain critical skills and IACET-approved CEUs that make a measurable difference.
During a study of wine grape harvest dates from 1600 to 2007, researchers discovered harvests began shifting dramatically earlier during the latter half of the 20th century. These shifts were caused by changes in the connection between climate and harvest timing. While earlier harvests from 1600 to 1980 occurred in years with warmer and drier conditions during spring and summer, from 1981 to 2007 warming attributed to climate change resulted in earlier harvests even in years without drought.
Related Article: Sequencing Study Lifts Veil on Wine’s Microbial Terroir
The finding is important because higher-quality wines are typically associated with earlier harvest dates in cooler wine-growing regions, such as France and Switzerland.
"Wine grapes are one of the world's most valuable horticultural crops and there is increasing evidence that climate change has caused earlier harvest days in this region in recent decades," said Ben Cook, lead author and climate scientist at NASA's Goddard Institute for Space Studies and the Lamont Doherty Earth Observatory at Columbia University in New York. "Our research suggests that the climate drivers of these early harvests have changed."
Indicators of wine quality, such as wine ratings, show the best years for grape harvest typically include warm summers with above-average rainfall early in the growing season and late-season drought.
Interested in lab design?
Is the form not loading? If you use an ad blocker or browser privacy features, try turning them off and refresh the page.
By completing this form, you agree to receive news updates and relevant promotional content from Lab Design News. You may unsubscribe at any time. View our Privacy Policy
"This gives vines plenty of heat and moisture to grow early in the season, while drier conditions later in the season shift them away from vegetative growth and toward greater fruit production" said the study's co-author, ecologist Elizabeth Wolkovich of Arnold Arboretum and the Department of Organismic and Evolutionary Biology at Harvard University, Cambridge, Mass.
Researchers conducted an analysis using 400 years of harvest data from Western Europe. The study considered variability and trends in harvest dates, climate data from instruments during the 20th century, and reconstructions from historical documents and tree rings of temperature, precipitation and soil moisture dating back to 1600.
That analysis was compared with shifts in wine quality in the Bordeaux and Burgundy regions of France based on the ratings of vintages during the past 100 years. Detailed quality information was available for those two regions in addition to the broader harvest data available throughout France and Switzerland.
The results indicate a fundamental shift in the role of drought and moisture as large-scale drivers of harvest time and wine quality. While warm temperatures have consistently led to earlier harvests and higher-quality wines, in recent decades the impact of drought has largely disappeared as a result of large-scale shifts in climate.
"Wine quality also depends on a number of factors beyond climate, including grape varieties, soils, vineyard management and winemaker practices," Cook said. "However, our research suggests the large-scale climate drivers these local factors operate under has shifted. And that information may prove critical to wine producers as climate change intensifies during the coming decades in France, Switzerland and other wine-growing regions."
The paper was published March 21 in the journal Nature Climate Change.
