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Heating rates and surface dimming due to black carbon aerosol absorption associated with a major U.S. city
Author(s) -
Schwarz J. P.,
Stark H.,
Spackman J. R.,
Ryerson T. B.,
Peischl J.,
Swartz W. H.,
Gao R. S.,
Watts L. A.,
Fahey D. W.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl039213
Subject(s) - aerosol , atmospheric sciences , environmental science , troposphere , absorption (acoustics) , ozone , carbon black , climatology , meteorology , materials science , geography , physics , geology , composite material , natural rubber
In situ airborne measurements of actinic flux and the mass and mixing state of individual refractory black carbon (BC) particles were made in the lower troposphere around a major U.S. metropolitan area. These data were used to estimate atmospheric heating rates and surface dimming due to absorption of solar radiation by refractory BC. Direct absorption by ozone is also calculated and averages 10% of that of BC below 4 km but becomes dominant above this altitude. Variability in BC absorption is large due to source variability and clouds. Average BC heating rates are much smaller than those associated with BC and other absorbing aerosol components in global hotspot regions. These results, which are specific to refractory BC absorption, will help determine the value of short‐term climate‐change mitigation strategies involving BC emission reductions. They may also be used to estimate refractory BC contributions to total aerosol absorption.