 |
| Titel |
Sources and fluxes of organic nitrogen in precipitation over the southern East Sea/Sea of Japan |
| VerfasserIn |
G. Yan, G. Kim |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 5 ; Nr. 15, no. 5 (2015-03-10), S.2761-2774 |
| Datensatznummer |
250119513
|
| Publikation (Nr.) |
 copernicus.org/acp-15-2761-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| We measured total dissolved reactive nitrogen in precipitation samples
collected at Uljin, a Korean coastal site upwind of the southern East Sea/Sea of Japan (EJS),
selected as a representative study site of atmospheric deposition
over the northwestern Pacific margin. NO3- was found to be the most
abundant nitrogen species, followed by NH4+ and dissolved organic
nitrogen (DON). Air-mass back-trajectory (AMBT) analysis revealed that a significant
fraction of the inorganic nitrogen (NO3- and NH4+) originated
from mainland Asia, whereas the DON was primarily derived from Korea. Using
varimax-rotated factor analysis in combination with major ions as tracers,
agricultural activities in Korea were identified as the primary sources of
DON in these samples. In addition, a positive correlation was found at Uljin
between the size of organic fraction in total reactive nitrogen and nitrogen
to carbon atomic ratio in organic matter. This correlation has also been
observed at other locations worldwide, implying the utilization potential of
atmospheric organic nitrogen might increase with its proportion in total
nitrogen. Combining wet deposition measurements in this study with literature
values for dry deposition observed at a remote island in the EJS, the total
atmospheric depositional flux of reactive nitrogen was estimated to be
115 mmol N m−2 yr−1 over the southern EJS. Our study sheds new
light on the potentially significant contribution to primary productivity of
the northwestern Pacific Ocean by atmospheric deposition of nitrogen,
especially the organic fraction. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|