Which climate factor contributes to Mosel Riesling's higher acidity and mineral profile?

• A. Warmer climate along the Mosel Valley
• B. Cooler microclimate along the river in the Mosel Valley
• C. Higher sugar accumulation
• D. Less rainfall

Answer: (B)

The key idea is that cooler temperatures slow grape ripening, helping Riesling retain natural acidity. The Mosel River creates a cooler microclimate with diurnal temperature swings, so grapes mature more slowly and accumulate less sugar while preserving acidity. This balance keeps the wine bright and sharp, which is why Riesling from this region often shows higher acidity. The mineral profile comes through more clearly when acidity is preserved and the wine expresses the terroir—slate soils that contribute mineral notes—rather than being overwhelmed by sweetness. In warmer climates, sugars rise and acidity falls, dulling that crisp, mineral character. Rainfall is less central to this effect than the cool climate and soil interaction.