Tropical African wildfire aerosols Trigger Teleconnections in the
mid-high latitude of Northern Hemisphere in Boreal Winter
Abstract
This study investigates the impacts of wildfire aerosols (primary
organic carbon, black carbon and sulfate) on the Northern hemispheric
boreal winter climate. We found that wildfire aerosols emitted from
equatorial Africa result in two mid-high latitude Rossby wave trains.
One is from subtropical Atlantic propagating northward across Europe to
Siberia, and the other one propagates eastward from Mid-East across Asia
to Northwest Pacific. The maximum positive height anomaly locates in
Europe, concurrent with a greater-than-2K surface warming. These Rossby
wave trains are excited by the atmospheric heating in equatorial Africa
and propagate into extratropics with the help of the westerly jet.
Through the heat budget analysis, the source of the Rossby wave is
primarily due to the solar absorption of black carbon in Africa. The
present study emphasize that aerosols especial the absorbing aerosols
would have profound thermo-dynamic effects on remote regions and need
more attentions.