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Response of a coupled chemistry‐climate model to changes in aerosol emissions: Global impact on the hydrological cycle and the tropospheric burdens of OH, ozone, and NO x
Author(s) -
Lamarque J.F.,
Kiehl J. T.,
Hess P. G.,
Collins W. D.,
Emmons L. K.,
Ginoux P.,
Luo C.,
Tie X. X.
Publication year - 2005
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 - 10.1029/2005gl023419
Subject(s) - aerosol , atmospheric sciences , ozone , tropospheric ozone , troposphere , environmental science , atmosphere (unit) , atmospheric chemistry , climate model , climatology , climate change , environmental chemistry , meteorology , chemistry , oceanography , geology , physics
In this study, we analyze the response of the coupled chemistry‐climate system to changes in aerosol emissions in fully coupled atmospheric chemistry‐climate‐slab ocean model simulations; only the direct radiative effect of aerosols and their uptake of chemical species are considered in this study. We show that, at the global scale, a decrease in emissions of the considered aerosols (or their precursors) produces a warmer and moister climate. In addition, the tropospheric burdens of OH and ozone increase when aerosol emissions are decreased. The ozone response is a combination of the impact of reduced heterogeneous uptake of N 2 O 5 and increased ozone loss in a moister atmosphere. Under reduced aerosol emissions, the tropospheric burden of NO x (NO + NO 2 ) is strongly reduced by an increase in nitric acid formation but also increased by the reduced N 2 O 5 uptake. Finally, we discuss the significant difference found between the combined impact of all aerosols emissions and the sum of their individual contributions.