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 found no difference in dust deposition rates between drought years and megadroughts, nor did they find a link to normal hydroclimate conditions. Instead, they concluded that dust deposition is more influenced by transport mechanisms and sediment supply than by rainfall patterns.  Arcusa's research also failed to show higher dust deposition during droughts on long time scales.