Submitted as: methods for assessment of models 05 Nov 2020
Submitted as: methods for assessment of models | 05 Nov 2020
Effects of black carbon morphology on the brown carbon absorption estimation: from numerical aspects
- State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China
- State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China
Abstract. In this work, we developed a numerical method to investigate the effects of black carbon morphology on the estimation of brown carbon (BrC) absorption using the Absorption Ångström exponent (AAE) method. Pseudo measurements of the total absorption were generated based on several morphologically mixed black carbon (BC) models, then the BrC absorption was inferred based on different AAE methods. By comparing the estimated BrC absorption with True
BrC absorption, we found that both AAE = 1 and Mie AAE methods do not provide accurate estimation for the BrC absorption, and the estimated BrC absorption can deviate several times from True
BrC absorption. The newly proposed Wavelength Dependent AAE (WDA) method does not necessarily improve the estimations, sometimes it may even provide worse estimations than the AAE = 1 and Mie AAE methods. Fixing the fractal dimension to be 1.8, the deviation between the estimated BrC mass absorption cross-section (MAC) and True
BrC MAC can reach approximately 9 m2/g, which is far more than brown carbon MAC itself. Therefore, the estimation of BrC absorption based on the AAE method should carefully consider the morphological effects of BC. Our findings highlight the BC morphological effects on the BrC absorption estimation.
Jie Luo et al.


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SC1: 'executive editor comment on gmd-2020-348', Astrid Kerkweg, 14 Nov 2020
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AC1: 'Response to the comments of Astrid Kerkweg', Qixing Zhang, 23 Nov 2020
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AC1: 'Response to the comments of Astrid Kerkweg', Qixing Zhang, 23 Nov 2020
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RC1: 'Review comment', Anonymous Referee #1, 26 Nov 2020
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AC2: 'Reply on RC1', Qixing Zhang, 30 Jan 2021
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AC2: 'Reply on RC1', Qixing Zhang, 30 Jan 2021
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RC2: 'Review of Luo et al.', Anonymous Referee #2, 15 Dec 2020
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AC3: 'Reply on RC2', Qixing Zhang, 30 Jan 2021
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AC3: 'Reply on RC2', Qixing Zhang, 30 Jan 2021
Jie Luo et al.
Data sets
Deriving_BrC_Revised.zip Jie Luo https://doi.org/10.6084/m9.figshare.12839570.v1
Jie Luo et al.
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TrueBrC mass absorption cross-section (MAC) can even reach approximately 9 m2/g, which far more than BrC MAC itself.