Molecular and Seasonal Distributions of Diacids, Oxoacids and α-Dicarbonyls and 14C in TC in Chinese Forest Aerosols-Data set

The combustion of fossil fuel, mainly coal combustion, release organic compounds, in addition to carbon dioxide (CO2), into the atmosphere. To study the coal-derived organic compounds and their potential impacts on the distributions of remote organic aerosols, particularly at forest ecosystems. Here, we studied the molecular and seasonal distributions of diacids, oxoacids and α-Dicarbonyls together with the radiocarbon (14C) in total carbon in forest fine aerosols from two sites: Mt. Changbai (n=61) in northern China and Xishuangbanna in southern China (n=60) from 2023 to 2024, which is shown in the sheet1 of the dataset . Concentrations of diacids and related compounds were measured using a capillary gas chromatography (GC; Agilent 7890B). Peak identification was carried out with reference to authentic standards retention time measured by GC-FID and mass spectra performed using a GC-mass spectrometry (GC-MS) system. In addition, we studied the radiocarbon isotopic composition (14C) of total aerosol carbon at forest site:Mt. Changbai (n=6), Xishuangbanna(n=6) and at Wuhai (n=13) located nearly underground coal fire area in Inner Mongolia, North China. Based on the molecular distributions and 14C of diacids and related compounds, as well as the mass ratios and linear relationships of selected species, we explored the sources of OA and the influence of long-range transported air masses on the composition and loading of OA in forest areas.