The Atmospheric Drivers of the Major Saharan Dust Storm in June 2020

Diana Francis, Ricardo Fonseca, Narendra Nelli, Juan Cuesta, Michael Weston, Amato Evan, Marouane Temimi

Research output: Contribution to journalLetterpeer-review

48 Scopus citations

Abstract

This study investigates the atmospheric dynamics of the major dust storm that occurred in June 2020 over the Sahara and during which dust clouds associated with the highest-on-record aerosol optical depths were transported toward the America. An anomalous atmospheric circulation pattern in the mid-latitudes, linked to a circumglobal wavetrain, resulted in the development of a subtropical high-pressure system to the west of the Saharan heat low. This created a pressure dipole and generated anomalously strong northeasterlies over the Sahara, which caused continuous dust emissions over 4 days. Occurring along the northern fringes of the intertropical discontinuity, the dust was transported to higher altitudes (6 km) by the strong updraft in this region. This injected the dust at the African Easterly Jet (AEJ) altitudes and favored a rapid westward long-range transport. The AEJ was also anomalously strong, being strengthened by the anticyclonic circulation associated with the anomalous high.

Original languageBritish English
Article numbere2020GL090102
JournalGeophysical Research Letters
Volume47
Issue number24
DOIs
StatePublished - 28 Dec 2020

Keywords

  • African Easterly Jet
  • intertropical discontinuity
  • monsoon trough
  • Saharan dust storms
  • Saharan heat low
  • subtropical high

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