Which factor is crucial to maximizing Torrontés aromatic expression at high altitude?

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Diurnal temperature shifts at high altitude are crucial because the big day-night temperature swings help build and lock in Torrontés’ delicate aromatics. Warm daytime temperatures promote the development of aroma precursors and volatile compounds, while cooler nights slow metabolism and reduce the loss of those aromas, preserving the wine’s bright floral and citrus character. This combination is especially beneficial for Torrontés grown in high-altitude vineyards, where the pronounced warm days and cool nights concentrate and enhance the grape’s aromatic profile.

Other factors don’t align as well with maximizing aroma: simply warm temperatures without the cool nights can drive off or degrade delicate volatiles; protecting from oxygen doesn’t actively boost aroma expression; uniform humidity lacks the stress and temperature cues that help aromatic compounds form and stay; and late harvest can push towards overripe flavors that dull the primary Torrontés aromatics.