实地验证褐碳吸收与酸度和气溶胶液态水含量的关系

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Prerna Thapliyal , Ashish Soni , Tarun Gupta
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引用次数: 0

摘要

棕色碳(BrC)是气溶胶的有机成分,具有吸光特性,对大气变暖和气候系统有重要影响,但它具有很大的不确定性。这种不确定性是由于其非静态光学特性,这为测量它们在地球辐射收支中引起的扰动提供了重大挑战。光学性质的不可预测性是由于次生BrC的不断形成和现有BrC的衰变受到环境大气中各种物理化学和气象因素的影响。气溶胶液态水含量(ALWC)和大气酸度可以通过影响其大气化学形成和衰变来影响这些发色团的动态行为。本研究的目的是调查ALWC和pH值方面的酸度如何影响印度东部在极端冬季很少检查的BrC光学性质。利用热光学碳分析仪对BrC的光学特性进行了估计。采用isoropia II热力学模型模拟ALWC和气溶胶pH值,得到研究期间的平均pH值为3.30±0.16。该研究首次提供了吸收系数随环境大气中pH值的增加或气溶胶酸度的减少而线性增加的现场证据。每单位pH增加吸收系数增加39.6 Mm−1,表明气溶胶pH是影响BrC化学的决定性因素之一。吸附系数与ALWC呈反比关系。研究结果表明,BrC化学对气溶胶酸度和环境大气中ALWC的敏感性及其在评估BrC吸收方面的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Field validation of brown carbon absorption dependence on acidity and aerosol liquid water content

Field validation of brown carbon absorption dependence on acidity and aerosol liquid water content
Brown Carbon (BrC) is an organic component of aerosols with light-absorbing characteristics that have crucial consequences in atmospheric warming and the climate system, yet it carries significant uncertainty. This uncertainty is due to its non-static optical properties which provide a significant challenge in the measurement of the perturbation caused by them in the Earth radiation budget. The unpredictability in optical properties is because of the continuous formation of Secondary BrC and decay of existing BrC influenced by various physicochemical and meteorological factors in the ambient atmosphere. The dynamic behaviour of these chromophores can be impacted by the aerosol liquid water content (ALWC) and atmospheric acidity via influencing its atmospheric chemistry of formation and decay. The objective of this research is to investigate how the ALWC and acidity in terms of pH affect the BrC optical properties in the rarely examined Eastern part of India during extreme winters. Utilizing a thermal-optical carbon analyzer, the optical characteristics of BrC were estimated. The ISORROPIA II, thermodynamic model was employed to simulate ALWC and aerosol pH, yielding a mean pH value of 3.30 ± 0.16 for the study duration. The study provides the first in-field evidence of a linear increase of absorption coefficient with increasing pH or decreasing aerosol acidity in the ambient atmosphere. A 39.6 Mm−1 increase in absorption coefficient per unit increase in pH, shows that aerosol pH is one of the decisive elements influencing BrC chemistry. The results also showed the inverse relation of the absorption coefficient with ALWC. The findings indicate the sensitivity of BrC chemistry towards aerosol acidity and ALWC in the ambient atmosphere and its importance while evaluating BrC absorption.
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来源期刊
Atmospheric Research
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.
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