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Wine forecast: Britain could be Chardonnay champions by 2050

05 December 2022

Chardonnay grapes on the vine

Over one-fifth of the UK may have suitable weather by mid-Century to grow Chardonnay grapes for still wines.

The impact of climate change by 2050 may mean that UK-grown Chardonnay grapes will be ripe enough to produce high quality still wines, in most years.

Following their model of the effect of variation in weather on Chablis wine quality, in France, researchers at the University of Reading have turned their attention to Chardonnay still wine production in the UK. Their work is published today (05 December 2022) in OENO One.

Alex Biss, a PhD student who led the project, said: “There are some great sparkling wines produced from Chardonnay grapes already in the UK, but the grapes used in sparkling wines don’t need as much ripening as for still wines. A good Chardonnay vintage is not attained reliably in Britain at present, but climate change looks set to change that in the not too distant future.”

The research model, developed by Biss and professor of crop science, Richard Ellis, considered three aspects of weather that affect the quality of Chardonnay still wine: mean temperature between April and September, mean minimum temperature in September (“cool night index”), and total rainfall between June and September. The model identified 20 to 25% of UK land may be suitable by 2050*. This compares to the current situation of only 2% of UK land**.

Biss said: “UK temperatures and rainfall in favourable regions will be aligned to produce consistently good Chardonnay wine by the middle of the century in most years.

“There are of course unknowns. Just because a region has a suitable climate, it doesn’t mean that it has the right sort of land for growing vines. But the fact remains that climate change will very likely bring a further expansion of viticulture in the UK.”

Areas most likely to have the best conditions for producing high-quality still Chardonnay wine reliably by 2050 include South East England, East of England, and Central England.

The RCP 4.5 pathway was selected to provide climate projections. This is an intermediate greenhouse gas emissions scenario in which climate policies can limit global temperature rise to between 2 °C and 3 °C by 2100***. Under this scenario, emissions continue to rise until around 2040, and then decline.

Biss said: “We are not celebrating global warming, which for so many is already causing major challenges to food production, public health, and more. Rather, it’s something that we must monitor and respond to by changing what we grow, and where. The immediate implication of our findings is that UK viticulturalists establishing new vines, in the areas above, should consider planting dual-purpose Chardonnay clones suitable for both sparkling and still wine production.”

* Using RCP 4.5 at the median percentile probability
** For the 2010 to 2019 period
*** For the period under study (2040-59) UK temperature and precipitation projections are broadly similar under RCP 2.6, RCP 4.5 and RCP 6.0

IMAGE: "Chardonnay grapes" by mollyali is licensed under CC BY-NC 2.0.

Biss, A. J., & Ellis, R. H. (2022). Weather potential for high-quality still wine from Chardonnay viticulture in different regions of the UK with climate change. OENO One, 56(4), 201–220. https://doi.org/10.20870/oeno-one.2022.56.4.5458

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