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Why is North America affected by the cold air from the Arctic Ocean southward in winter and northward in the Gulf of Mexico in summer?

1, terrain!

2. The northern plain of North America is smooth from north to south. Cold air from the north can go south in winter, and warm and humid air from the south can go north in summer. Therefore, water vapor mainly comes from the Arctic Ocean in winter and from the Gulf of Mexico in summer.

3. Look at the picture and you will know: