A dust particle can go on a great voyage. It starts on land; it continues in the air, and the saga might end with a fall into seawater thousands of miles from where it began.
NASA's Terra satellite captured this Saharan dust blowing over Italy and the Mediterranean Sea in December 2022.A dust particle can go on a great voyage. It starts on land; it continues in the air, where winds carry the particle up, up, and away. And—at least for some dust particles—that saga might end with a fall into seawater thousands of miles from where it began.
From there, dust particles are passengers of the world’s wind patterns. For instance, North African dust might ride the westerlies to Europe, or it might ride the trade winds from North Africa across the Atlantic. There are many questions that remain unanswered about this process. What precise role does the dust play in encouraging phytoplankton? Are there different types of dust that cause phytoplankton to respond in different ways?
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