Inorganic nitrogen and phosphorus in Western European aerosol and the significance of dry deposition flux into stratified shelf waters

White, C, Ussher, SJ, Fitzsimons, MF, Atkinson, S, Woodward, EMS, Yang, M and Bell, TG 2021 Inorganic nitrogen and phosphorus in Western European aerosol and the significance of dry deposition flux into stratified shelf waters. Atmospheric Environment, 261. 118391. https://doi.org/10.1016/j.atmosenv.2021.118391

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Abstract/Summary

Dry deposition of nitrogen (N) and phosphorus (P) from the aerosol phase represents a potential source of nutrients to marine surface waters. To investigate the significance of this deposition pathway, aerosol samples were collected from Penlee Point Atmospheric Observatory in SW England, UK, over a 6-month period (February to July 2015) covering the spring bloom. Samples were analysed for nitrate, ammonium and phosphate and the dry deposition flux of these nutrients calculated to assess its potential impact on primary production in nearby surface seawater. Aerosol-derived N and P deposition fluxes ranged from 2.7 to 620 μmol N m− 2 d− 1 and 0.16–1.6 μmol P m− 2 d− 1, respectively. Air mass back trajectory analysis indicated that the highest N fluxes were associated with polluted European air masses, highlighting a significant anthropogenic influence on N-content of aerosols. The N:P ratios of aerosol fluxes and water column concentrations indicated that P deposition was unlikely to be biologically significant in the region. In contrast, aerosol deposition was a significant episodic source of new N to marine phytoplankton after the onset of water column stratification. Carbon fixation estimates indicated that the maximum proportion of new primary production sustained by aerosol-N deposition was 22.4%, a factor of ten higher than the study average. These data suggest that enhanced N-deposition from polluted continental air masses could sustain pulses of surface ocean biological productivity during periods of dissolved N depletion.

Item Type:	Publication - Article
Additional Information. Not used in RCUK Gateway to Research.:	Corresponding author. E-mail address: Caroline.white12@plymouth.ac.uk (C. White)
Additional Keywords:	Atmospheric nitrogen Atmospheric phosphorus Dry deposition fluxes Marine Biogeochemistry Marine productivity European pollution
Divisions:	Plymouth Marine Laboratory > National Capability categories > Long-term Multi-Centre ACSIS Plymouth Marine Laboratory > National Capability categories > Single Centre NC - CLASS Plymouth Marine Laboratory > National Capability categories > Western Channel Observatory Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User:	S Hawkins
Date made live:	15 Jul 2021 13:41
Last Modified:	15 Jul 2021 13:41
URI:	https://plymsea.ac.uk/id/eprint/9266

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