The Routson study instead used dust accumulation rates and found no difference between dust deposition during drought years and megadroughts and deposition during normal hydroclimate conditions. Instead, they found that dust deposition is more likely controlled by transport mechanisms and sediment supply than by hydroclimate. Similarly, Arcusa found no evidence for higher dust deposition during drought on multi-decadal and centennial scales.
The Routson study and Arcusa's work both investigated the relationship between drought and dust deposition, but they found no evidence for a direct link. Instead, they concluded that dust deposition is more influenced by factors like transport mechanisms and sediment supply than by hydroclimate.