地壳元素铁的吸光贡献对黑碳吸光增强估算的影响——以武汉为例

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Abstract The traditional method uses empirical absorption Ångström exponent to estimate the light absorption of crustal elements or brown carbon, and this method can only handle the two components scenario (blackcarbon/brown carbon or blackcarbon/crustal elements), leading to substantial uncertainties. This study introduces a new method that uses the Fe as the crustal element tracer. Using measurement data in Wuhan (February, March, August, and September 2021) by applying the minimum R-squared method (MRS), the crustal elements light absorption contribution can be obtained. After subtracting the crustal elements light absorption, absorption enhancement factor (E_abs) can be obtained. The results showed that the average crustal elements absorption contribution at 370nm during the observation period was 12.3%, with a monthly average ranging from 5.7% to 15.5%. Meanwhile, AAE exhibited a positive dependence on the concentration of Fe. These collective clues indicate that the crustal elements absorption contribution cannot be ignored. Crustal elements light absorption demonstrated a considerable seasonality, which was low in winter and high in spring. There are deviations in the calculated E_abs before and after the separation of crustal elements light absorption, which is influenced by the correlation between blackcarbon and iron. During the observation period, after deducting the light absorption of crustal elements, the average E_abs was 1.43±0.53, and E_abs was high in spring and summer, and low in autumn and winter. HighE_abs in spring was associated with a higher degree of BC aging. The analysis found that E_abs demonstrated a positive dependence on the content of inorganic salts and organic matters, which proves the influence of these coating materials on the enhancement of light absorption.

Key words： mineral dust light absorption contribution black carbon light absorption enhancement minimum R-squared method (MRS) absorption Ångström exponent (AAE)

Received: 22 November 2021

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X513

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	TAN Jian
	XIA Rui
	WU Dui
	KONG Shao-fei
	CHEN Nan
	CHENG Chun-lei
	DENG Tao
	TAO Li-ping
	ZHANG Xue
	WU Bo-xi
	WU Liang-bin
	WANG Qing
	WU Cheng

Cite this article:

TAN Jian,XIA Rui,WU Dui等. Determination of crustal element iron light absorption contribution and effects on black carbon light absorption enhancement estimation: a case study in Wuhan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3033-3045.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3033

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