Seasonal variation of the concentrations of nitrogenous species and their nitrogen isotopic ratios in aerosols at Gosan, Jeju Island

Implications for atmospheric processing and source changes of aerosols

Shuvashish Kundu, Kimitaka Kawamura, Meehye Lee

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Abstract

Atmospheric aerosol samples (n = 84) were collected at Gosan site, Jeju Island, South Korea between April 2003 and April 2004 for the measurements of total nitrogen (TN) and its isotopic ratio (δ 15N) as well as nitrogen species (NH 4 + and NO 3 -). Measurements were also conducted for remained nitrogen (remained N) and removed nitrogen (removed N) on HCl fume treatment. A pronounced seasonal variation was found in the δ 15N of TN, remained N (mostly NH 4 +), and removed N (mostly NO 3 -). The highest mean δ 15N values of TN (+16.9‰ ±4.5‰) and remained N (+20.2‰ ±5.2‰) are detected in summer (June-August) whereas the lowest mean δ 15N values (+12.9‰ ±3.4‰ and +11.3‰ ±5.1‰, respectively) are in winter (December-February). These trends can partly be explained by an enhanced contribution of 15N-enriched emissions from agricultural straw burning in China in a harvest season (summer and autumn). The mean δ 15N of removed N showed an opposite trend: the lowest (+8.9‰ ±3.7‰) in warm season (March-August) and the highest (+14.1‰ ±3.7‰) in cold season (September-February). These results can be explained by changes in source regions and emission strengths of nitrogenous species, as well as difference in secondary aerosol nitrogen formation between warm and cold seasons. Higher ratios of Ca 2+/ Na + and the lowest ratios of Na +/(Cl - + NO 3 -) are associated with lower δ 15N values of removed N as a result of less isotopic enrichment (ε product-reactant) during the reaction between HNO 3 and dust particles. This study proposes that 15N/ 14N ratio can be regarded as process tracer of nitrogenous species in the atmosphere.

Original languageEnglish
Article numberD20305
JournalJournal of Geophysical Research D: Atmospheres
Volume115
Issue number20
DOIs
Publication statusPublished - 2010 Nov 8

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annual variations
Aerosols
isotopic ratio
aerosols
Nitrogen
seasonal variation
aerosol
nitrogen
Processing
summer
isotopic enrichment
fumes
South Korea
trends
Atmospheric aerosols
Fumes
autumn
Straw
straw
winter

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

@article{524d498c6bca40a1b15c269bfa0b402c,
title = "Seasonal variation of the concentrations of nitrogenous species and their nitrogen isotopic ratios in aerosols at Gosan, Jeju Island: Implications for atmospheric processing and source changes of aerosols",
abstract = "Atmospheric aerosol samples (n = 84) were collected at Gosan site, Jeju Island, South Korea between April 2003 and April 2004 for the measurements of total nitrogen (TN) and its isotopic ratio (δ 15N) as well as nitrogen species (NH 4 + and NO 3 -). Measurements were also conducted for remained nitrogen (remained N) and removed nitrogen (removed N) on HCl fume treatment. A pronounced seasonal variation was found in the δ 15N of TN, remained N (mostly NH 4 +), and removed N (mostly NO 3 -). The highest mean δ 15N values of TN (+16.9‰ ±4.5‰) and remained N (+20.2‰ ±5.2‰) are detected in summer (June-August) whereas the lowest mean δ 15N values (+12.9‰ ±3.4‰ and +11.3‰ ±5.1‰, respectively) are in winter (December-February). These trends can partly be explained by an enhanced contribution of 15N-enriched emissions from agricultural straw burning in China in a harvest season (summer and autumn). The mean δ 15N of removed N showed an opposite trend: the lowest (+8.9‰ ±3.7‰) in warm season (March-August) and the highest (+14.1‰ ±3.7‰) in cold season (September-February). These results can be explained by changes in source regions and emission strengths of nitrogenous species, as well as difference in secondary aerosol nitrogen formation between warm and cold seasons. Higher ratios of Ca 2+/ Na + and the lowest ratios of Na +/(Cl - + NO 3 -) are associated with lower δ 15N values of removed N as a result of less isotopic enrichment (ε product-reactant) during the reaction between HNO 3 and dust particles. This study proposes that 15N/ 14N ratio can be regarded as process tracer of nitrogenous species in the atmosphere.",
author = "Shuvashish Kundu and Kimitaka Kawamura and Meehye Lee",
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