Intrinsic Organic Carbon Could Contribute to the Unexplained Optical Measurements of Fresh Soot

IF 3.8 2区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Journal of Geophysical Research: Atmospheres Pub Date : 2024-09-26 DOI:10.1029/2024JD041457

Jie Luo, Miao Hu, Qixing Zhang, Congcong Li, Jia Liu, Hao He, Kaitao Li, Yuping Sun

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Abstract

Previous modeling studies have not properly explained the measured mass absorption cross section (MAC) at 550 nm, the linear backscattering depolarization ratio (LDR) at 355 and 532 nm, and the scattering matrix of soot at 532 nm. In this work, we attempt to use a black carbon (BC) model with an intrinsic organic carbon (OC) coating to explain the large MAC, large LDR, and measured scattering matrix. Our results show that the bare fractal BC model is not able to explain MAC, LDR, and scattering matrix simultaneously and that the modeling values do not cover the measurement range. This study shows that the modeled LDR and scattering matrix can cover the measurement range if we constrain the MAC of the BC in the measurement range by the intrinsic OC coating when we consider the effects of monomer radius, monomer number, and monomer overlap simultaneously. Therefore, intrinsic OC coating can be a significant source of uncertainty in the optical properties of fresh soot.

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内在有机碳可能是新鲜烟尘光学测量结果无法解释的原因之一

以往的建模研究无法正确解释 550 纳米波长的质量吸收截面 (MAC)、355 和 532 纳米波长的线性反向散射去极化比 (LDR) 以及 532 纳米波长的烟尘散射矩阵。在这项工作中，我们尝试使用带有固有有机碳（OC）涂层的黑碳（BC）模型来解释大 MAC、大 LDR 和测量到的散射矩阵。我们的结果表明，裸分形 BC 模型无法同时解释 MAC、LDR 和散射矩阵，而且建模值无法覆盖测量范围。本研究表明，如果我们同时考虑单体半径、单体数量和单体重叠的影响，通过本征 OC 涂层约束测量范围内 BC 的 MAC，则建模的 LDR 和散射矩阵可以覆盖测量范围。因此，固有 OC 涂层可能是新鲜烟尘光学特性不确定性的一个重要来源。

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来源期刊

Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics

CiteScore

7.30

自引率

11.40%

发文量

684

期刊介绍： JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.