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Why is sea fog common along the coasts of the Shandong Peninsula?

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old and new buildings in Jinan — Shandong Old and new buildings in Jinan, Shandong province, China.

Sea fog is a frequent occurrence along the coasts of the Shandong Peninsula primarily due to the presence of upwelling cold-water areas.1

When warm, moist air moves over these cooler coastal waters, the air is cooled to its dew point, leading to the condensation that forms fog. This phenomenon is particularly prevalent in regions where such temperature contrasts between the air and the sea surface are pronounced.21