TY - JOUR
T1 - Coastal Eutrophic Ecosystem as an Overlooked Pool of Atmospheric Formic Acid
T2 - Disentangling Biogenic and Abiotic Contributions
AU - Ding, Zhijian
AU - Zhu, Yucheng
AU - Wang, Guochen
AU - Li, Hao
AU - Xu, Jian
AU - Tian, Mengke
AU - Liu, Ziwei
AU - Chen, Jia
AU - Yun, Long
AU - Zheng, Haitao
AU - Gui, Huaqiao
AU - Liu, Jianguo
AU - Li, Rui
AU - Deng, Congrui
AU - Huang, Kan
N1 - Publisher Copyright:
© 2025 American Chemical Society
PY - 2025/10/14
Y1 - 2025/10/14
N2 - Formic acid (HCOOH), a key driver of secondary organic aerosol and cloud condensation nuclei formation, is systematically underestimated in atmospheric models due to inadequate source characterization. To address this gap, an integrated field campaign was conducted at a South China Sea (SCS) coastal site during the summer, focusing on gaseous HCOOH (HCOOHg). Measurements revealed that the average concentrations of HCOOHgreached as high as 6.7 μg/m3and 4.0 μg/m3under land and marine breeze, respectively. On marine breeze days, HCOOHgexhibited significant correlations with chlorophyll-a (Chl-a) and particulate organic carbon (POC) in seawater, implicating dual production pathways from both biogenic activities of phytoplankton and abiotic processes of dissolved organic matter degradation. Quantification of marine-sourced HCOOHgrevealed that these processes collectively accounted for around 16% of HCOOHg, with abiotic contributions double the biogenic contributions. Based on the established parametrization linking HCOOHgto marine tracers (POC and Chl-a), the spatial distribution of marine-sourced HCOOHgwas extrapolated over the SCS, identifying pronounced hotspots in eutrophic coastal regions. This work reveals the coastal eutrophic ecosystem as a pivotal yet unaccounted HCOOHgsource, emphasizing the necessity of coupling the interactions between marine biogeochemical processes and atmospheric chemical components into air quality and climate modeling.
AB - Formic acid (HCOOH), a key driver of secondary organic aerosol and cloud condensation nuclei formation, is systematically underestimated in atmospheric models due to inadequate source characterization. To address this gap, an integrated field campaign was conducted at a South China Sea (SCS) coastal site during the summer, focusing on gaseous HCOOH (HCOOHg). Measurements revealed that the average concentrations of HCOOHgreached as high as 6.7 μg/m3and 4.0 μg/m3under land and marine breeze, respectively. On marine breeze days, HCOOHgexhibited significant correlations with chlorophyll-a (Chl-a) and particulate organic carbon (POC) in seawater, implicating dual production pathways from both biogenic activities of phytoplankton and abiotic processes of dissolved organic matter degradation. Quantification of marine-sourced HCOOHgrevealed that these processes collectively accounted for around 16% of HCOOHg, with abiotic contributions double the biogenic contributions. Based on the established parametrization linking HCOOHgto marine tracers (POC and Chl-a), the spatial distribution of marine-sourced HCOOHgwas extrapolated over the SCS, identifying pronounced hotspots in eutrophic coastal regions. This work reveals the coastal eutrophic ecosystem as a pivotal yet unaccounted HCOOHgsource, emphasizing the necessity of coupling the interactions between marine biogeochemical processes and atmospheric chemical components into air quality and climate modeling.
KW - Formic acid
KW - South China Sea
KW - abiotic
KW - biogenic
KW - marine sources
UR - https://www.scopus.com/pages/publications/105018580836
U2 - 10.1021/acs.estlett.5c00894
DO - 10.1021/acs.estlett.5c00894
M3 - 文章
AN - SCOPUS:105018580836
SN - 2328-8930
VL - 12
SP - 1402
EP - 1410
JO - Environmental Science and Technology Letters
JF - Environmental Science and Technology Letters
IS - 10
ER -
