ACP - pH dependence of brown-carbon optical properties in cloud water
Por um escritor misterioso
Last updated 07 abril 2025

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.

Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau - Xu - 2020 - Journal of Geophysical Research: Atmospheres - Wiley Online Library

Full article: Discrepancies between brown carbon light-absorption properties retrieved from online and offline measurements

Optical properties and molecular composition of wintertime atmospheric water-soluble organic carbon in different coastal cities of eastern China - ScienceDirect

Spatial and Temporal Variability of Carbonaceous Aerosol Absorption in the Po Valley - Aerosol and Air Quality Research

ACP - pH dependence of brown-carbon optical properties in cloud water

Daytime SO2 chemistry on ubiquitous urban surfaces as a source of organic sulfur compounds in ambient air

Broadband optical properties of biomass‐burning aerosol and identification of brown carbon chromophores - Bluvshtein - 2017 - Journal of Geophysical Research: Atmospheres - Wiley Online Library

Full article: Probing the pH dependence of brown carbon formation: Insights from laboratory studies on aerosol particles and bulk phase solutions

Frontiers Augmenting Heritage Ocean-Color Aerosol Models for Enhanced Remote Sensing of Inland and Nearshore Coastal Waters

Advances in the Research on Brown Carbon Aerosols: Its Concentrations, Radiative Forcing, and Effects on Climate - Aerosol and Air Quality Research
Recomendado para você
-
MDPOPE music, videos, stats, and photos07 abril 2025
-
ACP - Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis07 abril 2025
-
Exploring the Nanostructures Accessible to an Organic Surfactant Atmospheric Aerosol Proxy07 abril 2025
-
Stream Faces Of The Voices (Feat. @MDPOPE) by outcas207 abril 2025
-
Frontiers Sediment Bulk Density Effects on Benthic Macrofauna Burrowing and Bioturbation Behavior07 abril 2025
-
most disturbed person on planet earth 2|TikTok Search07 abril 2025
-
Xeritin - MDPOPE MP3 Download & Lyrics07 abril 2025
-
M.D.P.O.P.E - Play & Download All MP3 Songs @WynkMusic07 abril 2025
-
Gas-Particle Uptake and Hygroscopic Growth by Organosulfate Particles07 abril 2025
-
Has anyone on here seen Most Disturbed Person On Planet Earth 2 aka, MDPOPE 2? : r/horror07 abril 2025
você pode gostar
-
Slendrina must die: the hause07 abril 2025
-
Need for Speed: Undercover – Wikipédia, a enciclopédia livre07 abril 2025
-
ALL NEW *SECRET* UPDATE CODES in SOUL EATER RESONANCE CODES07 abril 2025
-
Roblox best better blurst Memes & GIFs - Imgflip07 abril 2025
-
The Last Oricru - Metacritic07 abril 2025
-
Lista de Animes - Meus Animes Online07 abril 2025
-
How to Download Apps on a Chromebook Through the Google Play Store07 abril 2025
-
Steam disponibiliza jogo de drift totalmente grátis - Automais07 abril 2025
-
Dubladores de Os Cavaleiros do Zodíaco! #dublagembr#dublagem#dublagemb, Voice Actors Anime07 abril 2025
-
One Piece (season 18) - Wikipedia07 abril 2025