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← GeographyWhich outcome occurs when insolation variance reduces subtropical Hadley cell strength?
A)Equatorial jet stream weakens aloft✓
B)Meridional air pressure gradient increases
C)Ferrel cell strengthens proportionally poleward
D)Polar vortex expands to lower latitudes
💡 Explanation
A weakened Hadley cell reduces the poleward temperature gradient and thus jet stream strength aloft, because the thermal wind balance mechanism connects temperature gradients aloft with their airflow. The jet wanes as the surface heating differential declines, rather than strengthens, therefore influencing other latitudinal cells less noticeably under these circumstances.
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