| As a factor that increased kosa in the cool periods, it is said that, in these periods, cool air advanced southward more frequently due to changes in the air flow, increasing the frequency of dust storm occurrences. |
寒冷期に黄砂が増加した原因として、大気の流れの変化により寒気が南下する回数が増え、砂塵嵐の頻度が増えたことが挙げられている。 |