For decades, climate has been one of the principal reference points for distinguishing the profile of a wine. Warmer regions tend to produce full-bodied wines with higher alcohol content and intense aromas of ripe fruit, while cooler territories are generally associated with greater acidity, freshness, herbal notes and more delicate flavours. That division, however, is becoming less clear-cut.
Temperature directly affects the grape-ripening process. In warmer zones, ripening typically occurs more quickly, promoting sugar accumulation and reducing natural acidity. This combination can give rise to more alcoholic and concentrated wines, with aromas of ripe fruit, spices and, in some cases, notes of chocolate.
In cooler climates, the ripening process tends to be slower, allowing higher levels of acidity to be preserved. The result is generally fresher, lighter and more delicate wines with lower alcohol content. Even so, a region’s average temperature is not the only determining factor in the final profile of the wine.
Altitude, sun exposure, winds, rainfall patterns and the temperature differential between day and night also condition the development of the vines. These variables help explain why geographically close regions can present markedly different production conditions.
In California, for example, Sonoma tends to record cooler temperatures than Napa Valley. In Chile, the Casablanca Valley also has distinct climatic conditions from those found in the Maipo Valley, which is reflected in grape development and the style of wines produced.
Individual grape varieties respond differently to environmental conditions. A Cabernet Sauvignon produced in Bordeaux, France, tends to display greater freshness and herbal notes, while a wine of the same variety produced in Napa Valley, in the United States, is frequently associated with riper fruit and greater concentration.
In cooler climates, the ripening process tends to be slower, allowing higher levels of acidity to be preserved. The result is generally fresher, lighter and more delicate wines with lower alcohol content. Even so, a region’s average temperature is not the only determining factor in the final profile of the wine.
The same principle applies to other varieties. Grapes such as Riesling, Sauvignon Blanc and Pinot Noir have traditionally been associated with cooler regions, while Malbec, Grenache, Syrah and Zinfandel are more common in warmer environments. However, soils, vineyard management and rootstock selection can substantially alter these patterns.
Climate change is also reshaping historical reference points in viticulture. In Bordeaux, for instance, wines reaching 15% alcohol by volume are no longer unusual, bringing their profile closer to characteristics previously more associated with warm-region wines.
To limit the effects of rising temperatures, some producers are bringing forward their harvests and resorting to night-time picking, seeking to preserve grape acidity and reduce the risk of over-ripening. These strategies are gaining traction as producers work to maintain the balance of their wines.
Climate shifts also present distinct challenges for each region. Cooler zones remain exposed to the risk of frost and the difficulty of achieving adequate grape ripeness, while warmer regions face problems related to acidity loss and excessive sugar concentration.
In this context, the distinction between warm- and cool-climate wines remains a useful reference for understanding characteristics such as aroma, structure, freshness and alcohol content. Nevertheless, climate change and the evolution of practices in both the vineyard and the winery mean that these categories are today less rigid and, taken in isolation, no longer explain everything that ends up in the glass.
Source: Diário Económico
Original article: https://www.diarioeconomico.co.mz/?p=560226
