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← GeographyWhich outcome results when insolation variability weakens the equatorial temperature gradient?
A)Decreased upper-level wind shear✓
B)Strengthened subtropical high pressures
C)Intensified polar vortex stability
D)Increased Rossby wave amplitude
💡 Explanation
Reduced insolation creates a weaker temperature gradient, therefore diminished thermal wind shear reduces wind speed differences with height, because thermal wind balance relies on the temperature contrasts; rather than amplifying subtropical highs which require pressure gradients.
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