Dry-deposition of inorganic and organic nitrogen aerosols in Xiamen Bay: Fluxes, sources, and biogeochemical significance

Decadal response of atmospheric inorganic nitrogen dry deposition into offshore areas to policy controls

“…IN presents in surface waters is bioavailable and contribute to primary productivity 51 . To further estimated the contribution of aerosol-IN dry deposition to the ocean primary production, we converted the estimated aerosol-IN dry deposition fluxes into equivalent carbon fluxes by multiplying the deposition fluxes in the BS, NECS, WTS, and SCS by Redfield stoichiometry (6.625) 30 . This yielded ranges of 7.47×10 7 -1.97×10 8 g C /(km 2 •yr), 3.95×10 7 -7.55×10 7 g C /(km 2 •yr), 8.38×10 6 -7.87×10 7 g C /(km 2 •yr), and 3.59×10 7 -9.29×10 7 g C /(km 2 •yr) for each region respectively.…”

“…This yielded ranges of 7.47×10 7 -1.97×10 8 g C /(km 2 •yr), 3.95×10 7 -7.55×10 7 g C /(km 2 •yr), 8.38×10 6 -7.87×10 7 g C /(km 2 •yr), and 3.59×10 7 -9.29×10 7 g C /(km 2 •yr) for each region respectively. The total new production in the BS, NECS, WST, and SCS have been estimated to be 3.08×10 8 g C/(km 2 yr) 52 , 6.57×10 7 g C/(km 2 yr) 29 , 4.07×10 7 g C/(km 2 yr) 30 , and 3.08×10 8 g C/(km 2 yr) 53 , respectively. Thus, the contributions of decadal average aerosol-IN dry deposition to primary production in the BS, YRD, TS, and PRD were 39.8%, 86.4%, 85.2%, and 50.2%, respectively (Table S4).…”

“…Atmospheric nitrogen deposition has been reported to enhance eutrophication in the BS and SCS 26,27 . The proportions of nitrogen aerosol dry deposition contributed by new production were 17.5-18.2%, 8.3%, and 20% in the WTS, NECS, and SCS, respectively 26,[28][29][30] . Based on formula (10), higher wind speeds increase the proportion of ocean surface broken and, hence, increase deposition velocity.…”