Reduced surface fine dust under droughts over the southeastern United States during summertime: observations and CMIP6 model simulations

Abstract ∼ µ g m- 3 ∼ µ g m- 3 in the west. The anomalies of dust elemental ratios, satellite aerosol optical depth (AOD), and dust extinction coefficients suggest that both the emissions and trans-Atlantic transport of African dust are weakened when the SEUS is under droughts. Through the teleconnection patterns of the negative North Atlantic Oscillation (NAO), a lower-than-normal and more northeastward displacement of the Bermuda High (BH) is present during SEUS droughts, which results in less dust being transported into the SEUS. At the same time, enhanced precipitation in the Sahel associated with the northward shift of the Intertropical Convergence Zone (ITCZ) leads to lower dust emissions therein. Of the 10 selected models participating in the sixth phase of the Coupled Model Intercomparison Project (CMIP6), GISS-E2-1-G was found to perform the best in capturing the drought–dust sensitivity in the SEUS. This study reveals the mechanism of how droughts influence aerosol abundance through changing long-range transport of dust.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Reduced surface fine dust under droughts over the southeastern United States during summertime: observations and CMIP6 model simulations ; volume:22 ; number:12 ; year:2022 ; pages:7843-7859 ; extent:17 ; Atmospheric chemistry and physics ; 22, Heft 12 (2022), 7843-7859 (gesamt 17)

Contributors, Places and Time

• Creator: Li, Wei ; Wang, Yuxuan

Further information

• DOI: 10.5194/acp-22-7843-2022
• URN: urn:nbn:de:101:1-2022062305230771229776
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:20 AM CEST