Characterizing optical properties of HULIS versus WSOC in cloud water of Eastern China - Insights into secondary formation in cloud processes

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research Pub Date : 2025-03-26 DOI:10.1016/j.atmosres.2025.108091

Xinghui Liu , Huiting Mao , Xiaoling Nie , Jiebo Zhen , Ping Du , Tao Li , Xinfeng Wang , Likun Xue , Yan Wang , Jianmin Chen

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引用次数: 0

Abstract

Effects of humic like substances (HULIS) on cloud condensation nuclei, initiation of ice, and global radiative forcing of clouds highlight their significant influence on climate dynamics. However, optical properties of HULIS in cloud water and their indications remain poorly understood. Cloud water samples were gathered from June through August 2021 at Mt. Tai, China, and HULIS and water-soluble organic carbon (WSOC) within these samples were quantitatively analyzed. The optical characteristics of these substances were examined using UV–Vis and fluorescence spectroscopy. The average concentration of HULIS was 3.14 ± 2.14 mgC L⁻¹ contributing 38 ± 15 wt% to WSOC (9.42 ± 7.50 mgC L⁻¹). A mass absorption efficiency value at 365 nm (MAE₃₆₅) of 0.72 m² g⁻¹ and an absorption Ångström exponent (AAE₃₀₀_–₄₀₀) value of 3.79 were measured for HULIS compared to 0.54 m² g⁻¹ and 3.58 for WSOC. Three fluorescent components, i.e., less oxygenated HULIS (LO-HULIS), highly oxygenated HULIS (HO-HULIS), and protein-like substances (PRLIS), were identified in both HULIS and WSOC employing EEM and parallel factor analysis. HULIS light absorption was dominated by HO-HULIS, followed by that of LO-HULIS and PRLIS. Compared to WSOC, HULIS exhibited enhanced light absorption and a higher degree of humification, attributed to its elevated levels of HO-HULIS and LO-HULIS alongside reduced PRLIS. Furthermore, the degradation of PRLIS was posited as a potential pathway for LO-HULIS formation based on the increasing trend in the ratio of LO-HULIS:PRLIS with decreasing PRLIS in WSOC. This study explores secondary HULIS formation in cloud water, advancing our understanding of HULIS evolution.

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中国东部云水中HULIS和WSOC的光学性质表征——云过程中二次形成的见解

腐殖质样物质（HULIS）对云凝结核、冰的形成和云的全球辐射强迫的影响突出了它们对气候动力学的重要影响。然而，HULIS在云水中的光学性质及其指示仍然知之甚少。于2021年6月至8月在中国泰山采集了云水样品，并对这些样品中的HULIS和水溶性有机碳（WSOC）进行了定量分析。用紫外可见光谱和荧光光谱研究了这些物质的光学特性。HULIS的平均浓度为3.14±2.14 mgC L−1，对WSOC的贡献为38±15 wt%（9.42±7.50 mgC L−1）。HULIS在365 nm处的质量吸收效率值（MAE365）为0.72 m2 g−1，吸收Ångström指数（AAE300-400）为3.79，而WSOC为0.54 m2 g−1和3.58。利用EEM和平行因子分析，在HULIS和WSOC中分别鉴定了低氧化HULIS （LO-HULIS）、高氧化HULIS （HO-HULIS）和蛋白样物质（PRLIS）三种荧光成分。HULIS光吸收以HO-HULIS为主，LO-HULIS次之，PRLIS次之。与WSOC相比，HULIS表现出增强的光吸收和更高程度的腐殖化，这是由于其HO-HULIS和LO-HULIS水平升高以及PRLIS降低。此外，基于WSOC中LO-HULIS:PRLIS的比值随PRLIS的降低而增加的趋势，PRLIS的降解被认为是LO-HULIS形成的潜在途径。本研究探索了云水中HULIS的次生形成，促进了我们对HULIS演化的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.