Typically, dust is lifted to a maximum altitude of about 7 km within the SAL (5). If an individual 100-μm dust particle was uplifted to 6.5 km at wind speeds of 25 m s−1, and subject to a settling velocity of 0.4 m s−1 based on Stokes’ Law (19), then it would be transported ~400 km horizontally before reaching sea level. This is only about halfway to the most eastern sampling station M1 (12°N, 23°W) (4), 700 km from the west African coast, demonstrating that horizontal transport alone is insufficient, by far, for the long-range transport of even larger dust particles, such that some additional mechanisms are needed to keep these dust particles aloft.

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