ACP - pH dependence of brown-carbon optical properties in cloud water
Por um escritor misterioso
Last updated 16 junho 2024
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://acp.copernicus.org/articles/23/14437/2023/acp-23-14437-2023-f07.png)
Abstract. Light-absorbing organic species present in aerosols, collectively called brown carbon (BrC), have important but highly uncertain effects on climate. Clouds likely represent a significant medium for secondary BrC production and for bleaching reactions, though the relative importance of the formation and loss processes in clouds is unknown at present. The acidity (or pH) of atmospheric particles and clouds affects the optical properties of BrC and bleaching rates. Given the wide variability of pH in the atmosphere (pH in particles and clouds ranges from −1 to 8), the optical properties of BrC and its bleaching behavior are expected to vary significantly, and the link between pH and BrC is yet another uncertainty in attempts to constrain its climate forcing effects. In this work, we characterize the pH dependence of BrC optical properties – including light absorption at 365 nm (Abs365), the mass absorption coefficient (MAC365), and the absorption Ångström exponent (AAE) – in bulk cloud water sampled from the summit of Whiteface Mountain, NY. In all samples (n=17), Abs365 and MAC365 increased linearly with increasing pH, highlighting the importance of reporting pH in studies of BrC in aqueous media. There was strong variability in the sensitivity of Abs365 to pH, with normalized slopes that ranged from 5.1 % to 17.2 % per pH unit. The normalized slope decreased strongly with increasing cloud water [K+], suggesting that the non-biomass-burning BrC has optical properties that are more sensitive to pH than BrC associated with biomass burning. AAE also showed a distinct pH dependence as it was relatively flat between pH 1.5–5 and then decreased significantly above pH 5. The cloud water composition was used to inform thermodynamic predictions of aerosol pH upwind and/or downwind of Whiteface Mountain and the subsequent changes in BrC optical properties. Overall, these results show that, in addition to secondary BrC production, photobleaching, and the altitudinal distribution, the climate forcing of BrC is quite strongly affected by its pH-dependent absorption.
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://acp.copernicus.org/articles/20/4809/2020/acp-20-4809-2020-avatar-web.png)
ACP - Relations - pH dependence of brown-carbon optical properties in cloud water
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://pubs.rsc.org/image/article/2023/EA/d2ea00151a/d2ea00151a-f3_hi-res.gif)
Aqueous-phase photochemical oxidation of water-soluble brown carbon aerosols arising from solid biomass fuel burning - Environmental Science: Atmospheres (RSC Publishing) DOI:10.1039/D2EA00151A
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://pubs.acs.org/cms/10.1021/acs.est.3c03948/asset/images/large/es3c03948_0007.jpeg)
Secondary Formation of Atmospheric Brown Carbon in China Haze: Implication for an Enhancing Role of Ammonia
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://pubs.rsc.org/image/article/2022/EA/d1ea00055a/d1ea00055a-f8_hi-res.gif)
Linking the chemical composition and optical properties of biomass burning aerosols in ia - Environmental Science: Atmospheres (RSC Publishing) DOI:10.1039/D1EA00055A
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://aaqr.org/images/article_images/2023/8/0336_fig8.png)
Advances in the Research on Brown Carbon Aerosols: Its Concentrations, Radiative Forcing, and Effects on Climate - Aerosol and Air Quality Research
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://acp.copernicus.org/articles/23/14437/2023/acp-23-14437-2023-f08-web.png)
ACP - pH dependence of brown-carbon optical properties in cloud water
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://aaqr.org/images/article_images/2023/8/0336_fig2.png)
Advances in the Research on Brown Carbon Aerosols: Its Concentrations, Radiative Forcing, and Effects on Climate - Aerosol and Air Quality Research
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://media.springernature.com/m685/springer-static/image/art%3A10.1186%2Fs40645-023-00544-4/MediaObjects/40645_2023_544_Figa_HTML.png)
Climate-relevant properties of black carbon aerosols revealed by in situ measurements: a review, Progress in Earth and Planetary Science
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://media.springernature.com/m685/springer-static/image/art%3A10.1038%2Fs42004-022-00732-1/MediaObjects/42004_2022_732_Fig4_HTML.png)
Reactivity of aminophenols in forming nitrogen-containing brown carbon from iron-catalyzed reactions
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://pubs.acs.org/cms/10.1021/acsearthspacechem.0c00095/asset/images/large/sp0c00095_0003.jpeg)
Molecular Composition and the Optical Properties of Brown Carbon Generated by the Ethane Flame
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://www.science.org/cms/10.1126/sciadv.abq6830/asset/c6bc67c1-64ff-4a83-b996-1002167bc416/assets/images/large/sciadv.abq6830-f1.jpg)
Daytime SO2 chemistry on ubiquitous urban surfaces as a source of organic sulfur compounds in ambient air
![ACP - pH dependence of brown-carbon optical properties in cloud water](https://agupubs.onlinelibrary.wiley.com/cms/asset/026a2ff1-de86-494a-b5f4-c2d978ec2103/jgrd53803-fig-0002-m.jpg)
Broadband optical properties of biomass‐burning aerosol and identification of brown carbon chromophores - Bluvshtein - 2017 - Journal of Geophysical Research: Atmospheres - Wiley Online Library
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