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On Effective Radiative Forcing of Partial Internally and Externally Mixed Aerosols and Their Effects on Global Climate
Author(s) -
Zhou Chen,
Zhang Hua,
Zhao Shuyun,
Li Jiangnan
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2017jd027603
Subject(s) - radiative forcing , aerosol , atmospheric sciences , environmental science , intertropical convergence zone , climatology , relative humidity , precipitation , forcing (mathematics) , climate model , radiative transfer , middle latitudes , meteorology , climate change , physics , geology , oceanography , quantum mechanics
The total effective radiative forcing (ERF) due to partial internally mixed (PIM) and externally mixed (EM) anthropogenic aerosols, as well as their climatic effects since the year of 1850, was evaluated and compared using the aerosol‐climate online coupled model of BCC_AGCM2.0_CUACE/Aero. The influences of internal mixing (IM) on aerosol hygroscopicity parameter, optical properties, and concentration were considered. Generally, IM could markedly weaken the negative ERF and cooling effects of anthropogenic aerosols. The global annual mean ERF of EM anthropogenic aerosols from 1850 to 2010 was −1.87 W m −2 , of which the aerosol‐radiation interactive ERF (ERF ari ) and aerosol‐cloud interactive ERF (ERF aci ) were −0.49 and −1.38 W m −2 , respectively. The global annual mean ERF due to PIM anthropogenic aerosols from 1850 to 2010 was −1.23 W m −2 , with ERF ari and ERF aci of −0.23 and −1.01 W m −2 , respectively. The global annual mean surface temperature and water evaporation and precipitation were reduced by 1.74 K and 0.14 mm d −1 for EM scheme and 1.28 K and 0.11 mm d −1 for PIM scheme, respectively. However, the relative humidity near the surface was slightly increased for both mixing cases. The Intertropical Convergence Zone was southwardly shifted for both EM and PIM cases but was less southwardly shifted in PIM scheme due to the less reduction in atmospheric temperature in the midlatitude and low latitude of the Northern Hemisphere.