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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-601
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
24 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Atmospheric Water-Soluble Organic Nitrogen (WSON) in the Eastern Mediterranean: Origin and Ramifications Regarding Marine Productivity
Münevver Nehir and Mustafa Koçak Institute of Marine Sciences, Middle East Technical University, P.O. Box 28, 33731, Erdemli-Mersin, Turkey
Abstract. Two-sized aerosol and rain sampling were carried out at a rural site located on the coast of the Eastern Mediterranean, Erdemli, Turkey (36°33′54″ N and 34°15′18″ E). A total of 674 aerosol samples in two size fraction (coarse = 337; fine = 337) and 23 rain samples were collected between March 2014 and April 2015. Samples were analyzed for NO3, NH4+ and ancillary water-soluble ions by Ion Chromatography and water-soluble total nitrogen (WSTN) by applying a High Temperature Combustion Method. The mean aerosol WSON was 23.8 ± 16.3 nmol N m−3, reaching a maximum of 79 nmol N m−3, with about 66 % being associated with coarse particles. The volume weighted mean (VWM) concentration of WSON in rain was 21.5 µmol N L−1. The WSON contributed 37 % and 29 % to the WSTN in aerosol and rainwater, respectively. Aerosol WSON concentrations exhibited large temporal variations mainly due to rain and the origin of air mass flow. The highest mean aerosol WSON concentration was observed in the summer and was attributed to the absence of rain and re-suspension of cultivated soil in the region. The mean concentration of WSON during dust events (38.2 ± 17.5 nmol N m−3) was 1.3 times higher than that of non-dust events (29.4 ± 13.9 nmol N m−3). Source apportionment analysis demonstrated that WSON was originated from agricultural activities (43 %), secondary aerosol (20 %), nitrate (22 %), crustal (10 %) and sea-salt (5 %). The dry and wet depositions of WSON were equivalent and amounted to 36 % of the total atmospheric WTSN flux. Considering the Cilician Basin, the atmospheric water-soluble nitrogen flux would sustain 33 % and 76 % of the new production in the associated coastal and open waters, respectively.

Citation: Nehir, M. and Koçak, M.: Atmospheric Water-Soluble Organic Nitrogen (WSON) in the Eastern Mediterranean: Origin and Ramifications Regarding Marine Productivity, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-601, in review, 2017.
Münevver Nehir and Mustafa Koçak
Münevver Nehir and Mustafa Koçak
Münevver Nehir and Mustafa Koçak

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Short summary
Atmospheric samples of water-soluble organic nitrogen (WSON) obtained over the Eastern Mediterranean has been investigated. Aerosol WSON concentrations exhibited large temporal variations mainly due to rain and the origin of air flow. WSON was originated from agricultural activities, secondary aerosol, nitrate, crustal and sea-salt. In the Cilician Basin, the WSON flux would sustain 33 % and 76 % of the new production of the plantlike organisms in the coastal and open waters, respectively.
Atmospheric samples of water-soluble organic nitrogen (WSON) obtained over the Eastern...
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