The role of carbonaceous aerosols on short-term variations of precipitation over North Africa

TitleThe role of carbonaceous aerosols on short-term variations of precipitation over North Africa
Publication TypeJournal Article
Year of Publication2016
JournalAtmospheric Science Letters
Volume17
Number7
Pages407-414
Date Published06/2016
Abstract / Summary

Subtropical North Africa has been subject to extensive droughts in the late 20th century, linked to changes in the sea surface temperature (SST). However, climate models forced by observed SSTs cannot reproduce the magnitude of the observed rainfall reduction. Here, we propose aerosol indirect effects (AIE) as an important positive feedback mechanism. Model results are presented using two sets of sensitivity experiments designed to distinguish the role of aerosol direct/semi-direct and indirect effects on regional precipitation. Changes in cloud properties due to the presence of carbonaceous aerosols are proposed as a key mechanism to explain the reduced rainfall over subtropical North Africa.

URLhttp://onlinelibrary.wiley.com/doi/10.1002/asl.672/abstract
DOI10.1002/asl.672
Journal: Atmospheric Science Letters
Year of Publication: 2016
Volume: 17
Number: 7
Pages: 407-414
Date Published: 06/2016

Subtropical North Africa has been subject to extensive droughts in the late 20th century, linked to changes in the sea surface temperature (SST). However, climate models forced by observed SSTs cannot reproduce the magnitude of the observed rainfall reduction. Here, we propose aerosol indirect effects (AIE) as an important positive feedback mechanism. Model results are presented using two sets of sensitivity experiments designed to distinguish the role of aerosol direct/semi-direct and indirect effects on regional precipitation. Changes in cloud properties due to the presence of carbonaceous aerosols are proposed as a key mechanism to explain the reduced rainfall over subtropical North Africa.

DOI: 10.1002/asl.672
Citation:
2016.  "The role of carbonaceous aerosols on short-term variations of precipitation over North Africa."  Atmospheric Science Letters 17(7): 407-414.  https://doi.org/10.1002/asl.672.