Carbonic maceration is a winemaking technique associated with fresh, fruity red wines. It is especially linked to Beaujolais and Gamay, but it is used in many regions and with many grapes.
The method changes how fermentation begins. Instead of crushing all grapes and fermenting juice with skins, whole grape clusters are placed in a vessel with limited oxygen and often with carbon dioxide. Some fermentation-like activity begins inside intact berries before the grapes are pressed and fermentation finishes more conventionally.
What it does to flavor
Carbonic maceration can produce vivid fruit aromas: strawberry, raspberry, cherry, banana, bubblegum, kirsch, flowers, or candy-like notes. It often creates wines with soft tannins, juicy fruit, and an easy-drinking texture.
These aromas are not universal. Grape variety, temperature, vessel, time, oxygen, yeast, and whether the process is fully carbonic or semi-carbonic all influence the result.
Whole clusters and semi-carbonic styles
Many wines described as carbonic are actually semi-carbonic. Whole clusters go into a tank, the weight of the grapes crushes some berries at the bottom, and conventional yeast fermentation begins there. Carbon dioxide produced by fermentation then creates an environment for intracellular activity in intact berries above.
Semi-carbonic methods can produce wines that combine fresh fruit with more traditional red-wine structure.
Not only simple wine
Carbonic maceration is often associated with youthful, gluggable reds, but it is not only for simple wines. Some producers use whole clusters and partial carbonic methods to build aromatic lift, soften tannin, and emphasize freshness in serious wines.
What this means in the glass
If a red wine smells intensely of fresh strawberry, banana, bubblegum, or candied cherry and feels low in tannin, carbonic or semi-carbonic maceration may be part of the story. These wines are often enjoyable slightly chilled and with casual foods, but the category ranges from simple to complex.