ArticleiScience2026
Distinct molecular characteristics of humic-like substances (HULIS) in cloud water under land and marine influences.
Article in iScience, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Humic-like substances (HULISs) are a major fraction of cloud-water organic matter that modulate aqueous reactivity and light absorption. We sampled Mt. Tai cloud water (North China Plain) in summer 2021 under land-influenced (LI) and marine-influenced (MI) air-mass trajectories, isolated HULIS by solid-phase extraction, and characterized them using ultrahigh-resolution FT-ICR MS. HULIS averaged 3.1 ± 2.1 mgC L-1 (39 ± 16% of WSOC). LI concentrations were ∼2× MI, whereas the HULIS/WSOC fraction was higher in MI. We assigned 7,104 molecular formulas with substantial overlap but distinct unique pools (1,879 LI-unique; 787 MI-unique). LI-unique formulas were enriched in mid-high-mass CHOS and reduced carbon oxidation state signatures, while MI-unique formulas featured a low-mass, highly oxygenated diacid-like pool and aromatic/unsaturated character. These results show that air-mass provenance leaves persistent molecular fingerprints in cloud-water HULIS, informing source-to-cloud processing links and cloud-phase chemistry.
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