Marine sources of formaldehyde in the coastal atmosphere  

沿海大气甲醛的海洋来源

作　　者：Hengqing Shen Likun Xue Gen Zhang Yujiao Zhu Min Zhao Xuelian Zhong Yanqiu Nie Jinghao Tang Yuhong Liu Qi Yuan Huiwang Gao Tao Wang Wenxing Wang 申恒青;薛丽坤;张根;朱玉姣;赵敏;钟雪莲;乜艳秋;汤景皓;刘玉虹;袁琦;高会旺;王韬;王文兴

机构地区：[1]Environment Research Institute,Shandong University,Qingdao 266237,China [2]Department of Civil and Environmental Engineering,The Hong Kong Polytechnic University,Hong Kong 999077,China [3]State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry of CMA,Institute of Atmospheric Composition,Chinese Academy of Meteorological Sciences,Beijing 100081,China [4]Key Laboratory of Marine Environment and Ecology,Ministry of Education of China,Ocean University of China,Qingdao 266100,China [5]Marine Ecology and Environmental Science Laboratory,Laoshan Laboratory,Qingdao 266071,China

出　　处：《Science Bulletin》2025年第1期96-103,共8页科学通报(英文版)

基　　金：supported by the National Natural Science Foundation of China(42061160478 and 42105106);the Hong Kong Scholars Program(P0039835),the China Postdoctoral Science Foundation(2021M691921);the Shandong Provincial Natural Science Foundation(ZR2020QD059)。

摘　　要：Elevated concentrations of formaldehyde and other carbonyl compounds are frequently observed in the marine atmosphere but are often significantly underestimated by atmospheric models.To evaluate the potential impact of marine sources on atmospheric formaldehyde,high-resolution measurements were conducted at a coastal site(~15 m from the sea)during the summer in Qingdao,China.Observed formaldehyde levels averaged 2.4±0.9 ppbv(1 ppbv=10^(-9)L L^(-1)),with peaks reaching 6.8 ppbv.Backward trajectories indicate that formaldehyde concentrations remained high in marine air masses.Formaldehyde exhibited weak correlations with primary pollutants such as NO and CO but showed strong correlations with marine tracers,notably methyl ethyl ketone and 1-butene.Chamber experiments confirmed that the photodecomposition of Enteromorpha released large amounts of formaldehyde and marine tracer species.When normalized to acetylene,the levels of formaldehyde,1-butene,and MEK increased by factors of 3.8,8.1,and 3.5,respectively.Results from an observation-based chemical box model simulation,which utilizes the Master Chemical Mechanism(MCM),revealed that formaldehyde contributes 56% to the primary source of HO_(2)radicals,while neglecting formaldehyde chemistry would lead to a 15% reduction in coastal ozone production rates.This study interlinks oceanic biology and atmospheric chemistry,advancing the understanding of the ocean’s role as a significant source of organic compounds and its contribution to carbon cycling.

关 键 词：FORMALDEHYDE Coastal atmosphere ENTEROMORPHA MARINE OZONE 

分 类 号：P402[天文地球—大气物理学与大气环境] P734[天文地球—大气科学及气象学]