Chapter 6: Problem 8

What does an isobaric map of surface air pressure portray? Contrast pressures over North America for January and July.

Short Answer

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An isobaric map portrays the geographical distribution of atmospheric pressure using lines of equal pressure (isobars). The surface air pressure over North America is typically higher in January and lower in July, due to changes in temperature and air density. However, specific patterns can vary based on local weather phenomena.

Step by step solution

Understanding Isobaric Maps

An isobaric map is a geographical representation that uses isobars, lines of equal atmospheric pressure, to depict variations in pressure across a particular area. It's helpful for understanding weather patterns as it can depict areas of high and low pressure.

Analysis of air pressure in January

In January, the surface air pressure over North America tends to be higher due to the cold winter temperatures leading to denser air. High pressure zones, or 'ridges', are thus often observed especially in the Northern regions. These can be seen on an isobaric map as areas where the isobars are closely packed together.

Analysis of air pressure in July

In July, the surface air pressure over North America may be lower due to the warm summer temperatures causing the air to expand and become less dense. Isobaric maps during this period often show 'troughs', or areas of low pressure, especially in Southern regions. These areas will have isobars that are spread farther apart.

Contrast between January and July

While the pressure varies over time, one could generally expect higher pressure zones over North America in January due to colder temperatures, and lower pressure zones in July due to warmer temperatures. It should be noted that local weather activities such as storms or other phenomena can affect these general trends.

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What does an isobaric map of surface air pressure portray? Contrast pressures over North America for January and July.

Short Answer

Step by step solution

Understanding Isobaric Maps

Analysis of air pressure in January

Analysis of air pressure in July

Contrast between January and July

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