Seasonal Study of Stable Carbon and Nitrogen Isotopic Composition in Fine Aerosols at a Central European Rural Background Station.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F19%3A00503685" target="_blank" >RIV/67985858:_____/19:00503685 - isvavai.cz</a>

Result on the web

<a href="https://www.atmos-chem-phys.net/19/3463/2019/acp-19-3463-2019.pdf" target="_blank" >https://www.atmos-chem-phys.net/19/3463/2019/acp-19-3463-2019.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/acp-19-3463-2019" target="_blank" >10.5194/acp-19-3463-2019</a>

Result language

angličtina

Original language name

Seasonal Study of Stable Carbon and Nitrogen Isotopic Composition in Fine Aerosols at a Central European Rural Background Station.

Original language description

A study of the stable carbon isotope ratios (δ 13 C) of total carbon (TC) and the nitrogen isotope ratios (δ 15 N) of total nitrogen (TN) was carried out for fine aerosol particles (PM 1 ) and was undertaken every 2 days with a 24 h sampling period at a rural background site in Košetice (Central Europe) from 27 September 2013 to 9 August 2014 (n = 146). We found a seasonal pattern for both δ 13 C and δ 15 N. The seasonal variation in δ 15 N was characterized by lower values (average of 13:1±4:5 %) in winter and higher values (25:0±1:6 %) in summer. Autumn and spring were transition periods when the isotopic composition gradually changed due to the changing sources and ambient temperature. The seasonal variation in δ 13 C was less pronounced but more depleted in 13 C in summer (-27:8±0:4 %) as compared to winter (-26:7±0:5 %). A comparative analysis with water-soluble ions, organic carbon, elemental carbon, trace gases and meteorological parameters (mainly ambient temperature) has shown major associations with the isotopic compositions, which has provided greater knowledge and understanding of the corresponding processes. A comparison of δ 15 N with NO - 3 , NH + 4 and organic nitrogen (OrgN) revealed that although a higher content of NO - 3 was associated with a decrease in the δ 15 N of TN, NH + 4 and OrgN caused increases. The highest concentrations of nitrate, mainly represented by NH 4 NO 3 related to the emissions from biomass burning leading to an average δ 15 N of TN (13.3%) in winter. During spring, the percentage of NO - 3 in PM 1 decreased. An enrichment of 15 N was probably driven by the equilibrium exchange between the gas and aerosol phases (NH 3 (g)→NH + 4 (p)), which is supported by the increased ambient temperature. This equilibrium was suppressed in early summer when the molar ratios of NH + 4 =SO 2- 4 reached 2, and the nitrate partitioning in aerosol was negligible due to the increased ambient temperature. Summertime δ 15 N values were among the highest, suggesting the aging of ammonium sulfate and OrgN aerosols. Such aged aerosols can be coated by organics in which 13 C enrichment takes place by the photooxidation process. This result was supported by a positive correlation of δ 13 C with ambient temperature and ozone, as observed in the summer season. During winter, we observed an event with the lowest δ 15 N and highest δ 13 C values. The winter event occurred in prevailing southeast air masses. Although the higher δ 13 C values probably originated from biomass-burning particles, the lowest δ 15 N values were probably associated with agriculture emissions of NH 3 under low-temperature conditions (< 0 °C).

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Atmospheric Chemistry and Physics

ISSN

1680-7316

e-ISSN

—

Volume of the periodical

19

Issue of the periodical within the volume

6

Country of publishing house

DE - GERMANY

Number of pages

17

Pages from-to

3463-3479

UT code for WoS article

000461615700003

EID of the result in the Scopus database

2-s2.0-85063204644