关键词:
Formaldehyde
Coastal atmosphere
Enteromorpha
Marine
Ozone
摘要:
Elevated concentrations of formaldehyde and other carbonyl compounds are frequently observed in the marine atmosphere but are often significantly underestimated by atmospheric *** 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,*** formaldehyde levels averaged 2.4±0.9 ppbv(1 ppbv=10^(-9)L L^(-1)),with peaks reaching 6.8 *** trajectories indicate that formaldehyde concentrations remained high in marine air *** exhibited weak correlations with primary pollutants such as NO and CO but showed strong correlations with marine tracers,notably methyl ethyl ketone and *** experiments confirmed that the photodecomposition of Enteromorpha released large amounts of formaldehyde and marine tracer *** normalized to acetylene,the levels of formaldehyde,1-butene,and MEK increased by factors of 3.8,8.1,and 3.5,*** 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 *** 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.