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Role of spatial and temporal variations in the computation of radiative forcing due to sulphate aerosols: A regional study
Author(s) -
Myhre Gunnar,
Jonson Jan E.,
Bartnicki Jerzy,
Stordal Frode,
Shine Keith P.
Publication year - 2002
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1256/0035900021643610
Subject(s) - radiative forcing , forcing (mathematics) , aerosol , relative humidity , radiative transfer , environmental science , atmospheric sciences , climatology , spatial ecology , temporal resolution , humidity , meteorology , geography , geology , physics , ecology , quantum mechanics , biology
A high‐resolution regional model for sulphate aerosols is used to investigate the effects of spatial and temporal averaging of radiative forcing. Mie theory is used to calculate the aerosol optical properties. The strong hygroscopic growth with increasing relative humidity is taken into account. The results for the regional area selected in our study (Europe and much of the North Atlantic) show that earlier global studies may have underestimated the magnitude of the radiative forcing due to sulphate aerosols by up to 30–40% due to coarse spatial and/or temporal resolution, at least over certain regions. This underestimation in global models of the water uptake is important for all strongly scattering hygroscopic aerosols. Our results imply that representation of relative humidity at even higher spatial resolution than used in this study may be of importance. This could be incorporated in models using subgrid‐scale parametrizations of the relative humidity. Copyright © 2002 Royal Meteorological Society.