Examine the following surface isobars (purple) and wind vectors (red). In which figure is the red surface wind vector correctly drawn?

Question

Examine the following surface isobars (purple) and wind vectors (red).  In which figure is the red surface wind vector correctly drawn?

BlackTom AI · Accepted Answer

To determine which figure correctly draws the surface wind vector, we need to recall how surface winds circulate around a low-pressure system and how isobars orient a wind flow.
Option A: In this figure, the red vector appears to be directed in a way that does not align with the cyclonic (counterclockwise in the Northern Hemisphere) flow around the low-pressure center. The vector seems to cut across the isobar gradients rather than following the tangential direction around the center, which suggests a mismatch with expected surface wind direction.
Option B: Here, the red vector again fails to consistently follow the tangential path around the low-pressure center. It looks misaligned with the local pressure gradient and would imply crossing isobars rather than flowing along them in the cyclonic loop, which is not how surface winds typically behave around a low.
Option C: This drawing shows a wind vector that is more aligned with a straight-line path that cuts across several isobars, rather than following the circular, counterclockwise flow around the center. In other words, the orientation does not conform to the rotational pattern expected near a low.
Option D: The red wind vector in this figure follows a direction that is tangential to the concentric isobars surrounding the low-pressure center, consistent with cyclonic flow (counterclockwise in the Northern Hemisphere). The vector aligns with the gradient of the pressure field, indicating winds moving parallel to the isobars as they encircle the low.
In summary, each option’s vector orientation is judged by whether it respects the local pressure gradient and wind circulation pattern around a low: cross-isobar arrows indicate incorrect depiction, while a tangential, CCW-oriented arrow around the low matches the physics. The figure that preserves this tangential, circular flow around the low is the one that correctly draws the surface wind vector.

Examine the following surface isobars (purple) and wind vectors (red). In which figure is the red surface wind vector correctly drawn?单项选择题

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