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Dissolved Black Carbon and Semivolatile Aromatic Hydrocarbons in the Ocean: Two Entangled Biogeochemical Cycles?
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2021-09-09 , DOI: 10.1021/acs.estlett.1c00658
Núria Trilla-Prieto 1 , Maria Vila-Costa 1 , Gemma Casas 1 , Begoña Jiménez 2 , Jordi Dachs 1
Affiliation  

Dissolved black carbon (DBC) plays a role in the oceanic carbon cycle. DBC originates from the heating and incomplete combustion of organic matter, including fossil fuels, a shared origin with polycyclic aromatic hydrocarbons (PAH). DBC is quantified using the benzene polycarboxylic acids produced by oxidation of the organic extract, a fraction of which derive from PAHs and other semivolatile aromatic-like compounds (SALCs). However, the current view of the DBC cycle does not take into account the inputs and sinks known for PAHs, such as diffusive air–water exchange and degradation. A meta-analysis of oceanic PAHs, SALCs, and DBC concentrations shows that SALCs account for 16% of DBC (ranging from 5% to 31%). Such a large contribution of semivolatile aromatic hydrocarbons to DBC is consistent with the large atmospheric input of SALCs (estimated as 400 Tg C y–1). Furthermore, photodegradation at the surface ocean and microbial degradation in the water column of semivolatile DBC can be important sinks, consistent with the ubiquitous occurrence of the degradation genes of the metabolic routes for aromatic hydrocarbons. Future work should focus on the characterization of semivolatile DBC and its degradation in order to constrain its contribution to refractory organic matter and the anthropogenic perturbation of the carbon cycle.

中文翻译:

海洋中溶解的黑碳和半挥发性芳香烃:两个相互纠缠的生物地球化学循环?

溶解黑碳 (DBC) 在海洋碳循环中发挥作用。DBC 源于有机物质的加热和不完全燃烧,包括化石燃料,这是与多环芳烃 (PAH) 的共同来源。DBC 使用有机提取物氧化产生的苯多羧酸进行量化,其中一部分来自 PAH 和其他半挥发性芳香族化合物 (SALC)。然而,目前对 DBC 循环的看法没有考虑 PAH 已知的输入和汇,例如空气-水的扩散交换和降解。对海洋 PAH、SALC 和 DBC 浓度的荟萃分析表明,SALC 占 DBC 的 16%(从 5% 到 31%)。–1 )。此外,表层海洋的光降解和半挥发性 DBC 水体中的微生物降解可能是重要的汇,这与普遍存在的芳烃代谢途径的降解基因一致。未来的工作应侧重于半挥发性 DBC 及其降解的表征,以限制其对难降解有机物的贡献和碳循环的人为扰动。
更新日期:2021-10-12
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