 |
| Titel |
A nitrogen budget for the Strait of Georgia, British Columbia, with emphasis on particulate nitrogen and dissolved inorganic nitrogen |
| VerfasserIn |
J. N. Sutton, S. C. Johannessen, R. W. Macdonald |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-12), S.7179-7194 |
| Datensatznummer |
250085407
|
| Publikation (Nr.) |
 copernicus.org/bg-10-7179-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Balanced budgets for dissolved inorganic N (DIN) and particulate N (PN) were
constructed for the Strait of Georgia (SoG), a semi-enclosed coastal sea off
the west coast of British Columbia, Canada. The dominant control on the N
budget is the advection of DIN into and out of the SoG via Haro Strait. The
annual influx of DIN by advection from the Pacific Ocean is 29 990 (±19 500) Mmol yr−1.
The DIN flux advected out of the SoG is 24 300
(±15 500) Mmol yr−1. Most of the DIN that enters the SoG
(~ 23 400 Mmol yr−1) is converted to particulate N (PN) in
situ by primary production. However, most of the PN produced by primary
production is remineralized (~ 22 000 Mmol yr−1) back
into DIN within the top 50 m. The PN budget for the SoG was further
constrained by nitrogen isotope composition (δ15N) that
indicated regional differences in the source of PN. The southern strait
receives a much higher proportion of terrigenous PN, relative to marine PN,
than does the northern strait. The difference is due to the influence of the
Fraser River, which discharges 1950 Mmol yr−1 of PN and 1660 Mmol yr−1
of DIN into the southern strait. The overall anthropogenic
contribution of PN and DIN to the SoG is minimal relative to natural sources
(> 30 000 Mmol yr−1). It is unlikely that the strait will be affected by
eutrophication in the near future, although anthropogenic N sources, such as
wastewater outfalls, may have significant local effects. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|