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• W4281737204 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Biomass burning emissions often contain brown carbon (BrC), which represents a large family of light-absorbing organics that are chemically complex, thus making it difficult to estimate their absorption of incoming solar radiation, resulting in large uncertainties in the estimation of the global direct radiative effect of aerosols. Here we investigate the contribution of BrC to the total light absorption of biomass burning aerosols over the South-East Atlantic Ocean with different optical models, utilizing a suite of airborne measurements from the ORACLES 2018 campaign. An effective refractive index of black carbon (BC), <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M1 display=inline overflow=scroll dspmath=mathml><mrow><msub><mi>m</mi><mi mathvariant=normal>eBC</mi></msub><mo>=</mo><mn mathvariant=normal>1.95</mn><mo>+</mo><mi>i</mi><msub><mi>k</mi><mi mathvariant=normal>eBC</mi></msub></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=98pt height=12pt class=svg-formula dspmath=mathimg md5hash=47417b18dd57631c5c878410f3cc0b7a><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=acp-22-9199-2022-ie00001.svg width=98pt height=12pt src=acp-22-9199-2022-ie00001.png/></svg:svg></span></span>, that characterizes the absorptivity of all absorbing components at 660 nm wavelength was introduced to facilitate the attribution of absorption at shorter wavelengths, i.e. 470 nm. Most values of the imaginary part of the effective refractive index, <span class=inline-formula><i>k</i>_eBC</span>, were larger than those commonly used for BC from biomass burning emissions, suggesting contributions from absorbers besides BC at 660 nm. The TEM-EDX single-particle analysis further suggests that these long-wavelength absorbers might include iron oxides, as iron is found to be present only when large values of <span class=inline-formula><i>k</i>_eBC</span> are derived. Using this effective BC refractive index, we find that the contribution of BrC to the total absorption at 470 nm (<span class=inline-formula><i>R</i>_BrC,470</span>) ranges from <span class=inline-formula>∼8</span> %–22 %, with the organic aerosol mass absorption coefficient (MAC<span class=inline-formula>_OA,470</span>) at this wavelength ranging from <span class=inline-formula>0.30±0.27</span> to <span class=inline-formula>0.68±0.08</span> m<span class=inline-formula>²</span> g<span class=inline-formula>^−1</span>. The core–shell model yielded much higher estimates of MAC<span class=inline-formula>_OA,470</span> and <span class=inline-formula><i>R</i>_BrC,470</span> than homogeneous mixing models, underscoring the importance of model treatment. Absorption attribution using the Bruggeman mixing Mie model suggests a minor BrC contribution of 4 % at 530 nm, while its removal would triple the BrC contribution to the total absorption at 470 nm obtained using the AAE (absorption à ngström exponent) attribution method. Thus, it is recommended that the application of any optical properties-based attribution method use absorption coefficients at the longest possible wavelength to minimize the influence of BrC and to account for potential contributions from other absorbing materials." @default.
• W4281737204 created "2022-06-13" @default.
• W4281737204 creator A5044757881 @default.
• W4281737204 date "2022-06-07" @default.
• W4281737204 modified "2023-09-26" @default.
• W4281737204 title "Response to comments on acp-2021-1000" @default.
• W4281737204 doi "https://doi.org/10.5194/acp-2021-1000-ac1" @default.
• W4281737204 hasPublicationYear "2022" @default.
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