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Zorluk: OrtaAtmosphere and Weather

During a weather observation in the Northern Hemisphere, a meteorologist tracks a developing surface low-pressure system (cyclone). Which of the following describes the rotational pattern of the surface winds and the vertical movement of air at the center of this system?

  1. A
    Surface winds blow clockwise and spiral outward, causing air at the center to sink and warm.
  2. B
    Surface winds blow counterclockwise and spiral outward, causing air at the center to sink and compress.
  3. Surface winds blow counterclockwise and spiral inward, causing air at the center to rise and cool.Cevap
  4. D
    Surface winds blow clockwise and spiral inward, causing air at the center to evaporate without rising.

Cevap

Surface winds blow counterclockwise and spiral inward, causing air at the center to rise and cool.
In the Northern Hemisphere, the pressure gradient force directs surface air inward toward the center of low pressure, while the Coriolis effect deflects this moving air to the right, generating a net counterclockwise inward spiral (cyclonic flow). As the surface winds converge at the low-pressure center, the air is forced to rise, which leads to adiabatic cooling, condensation, and cloud formation.

Adım Adım Çözüm

1
Determine the direction of horizontal surface winds around a low-pressure area in the Northern Hemisphere.
Air moves from higher surrounding pressure inward toward the low-pressure center and is deflected to the right by the Coriolis effect, creating a counterclockwise inward spiral.
Pressure gradient force drives air inward, while Earth's rotation (Coriolis effect) deflects moving air to the right in the Northern Hemisphere.
2
Determine the vertical air motion resulting from horizontal convergence at the center of the low-pressure system.
Converging surface air has nowhere to go but upward, leading to ascending air currents that expand and adiabatically cool.
Mass conservation at the surface forces converging air to rise, which typically causes water vapor condensation, cloud development, and precipitation.

Anahtar Kavram

Cyclonic Circulation and Vertical Air Motion in Low-Pressure Systems
Tahmini Süre:1m 0s
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Konular

Atmosphere and Weather

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