Organic nitrogen in Hawaiian rain and aerosol

Cornell, S, Mace, K, Coeppicus, S, Duce, R, Huebert, B, Jickells, T and Zhuang, L-Z (2001) Organic nitrogen in Hawaiian rain and aerosol. Journal of Geophysical Research, 106 (D8). pp. 7973-7983. ISSN 0148-0227

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Abstract

Water-soluble organic nitrogen (ON) is an important component of fixed nitrogen in clean marine aerosol and rainwater collected at a site on the windward coast of Oahu, Hawaii. Aerosol material associated with the predominant trade winds carries 3.3 ± 2.0 nmol ON m-3, which makes up roughly one third of the total nitrogen in aerosol (11 ± 4 nmol N m-3). The inorganic nitrogen (65% as nitrate) is predominantly found in coarse-mode aerosol, consistent with displacement reactions of sea-salt chloride. In contrast, most of the ON is found in fine particle (submicrometer) aerosol, and may be associated with gas-to-particle conversions and with long-range transport in the atmosphere. At times, aerosol ON also appears to have a local, anthropogenic source, and when meteorological conditions are favorable, large pulses of ON from these local sources can dominate the total fixed nitrogen in the sampled aerosol (30-50 nmol ON m-3, contributing about 80% of the total aerosol nitrogen). About one fifth of rainwater dissolved nitrogen at this site is organic nitrogen. The average rainwater concentration of dissolved ON was 2.8 µmol N L-1, and of inorganic nitrogen (nitrate plus ammonium) was 15 µmol N L-1. In both rainwater and aerosol, urea was a major component of the ON, contributing about half of the ON and about 15% of total nitrogen. This quantitative importance of urea as a component of ON has not previously been seen in continental locations.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 13 Jun 2011 09:43
Last Modified: 21 Apr 2020 20:58
URI: https://ueaeprints.uea.ac.uk/id/eprint/32302
DOI: 10.1029/2000JD900655

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