 |
| Titel |
Diatom flux reflects water-mass conditions on the southern Northwind Abyssal Plain, Arctic Ocean |
| VerfasserIn |
J. Onodera, E. Watanabe, N. Harada, M. C. Honda |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 5 ; Nr. 12, no. 5 (2015-03-04), S.1373-1385 |
| Datensatznummer |
250117842
|
| Publikation (Nr.) |
 copernicus.org/bg-12-1373-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| We studied time-series fluxes of diatom particles from 4 October 2010 to 18
September 2012 using bottom-tethered moorings with two sediment traps
deployed at 180 and 1300 m depths at Station NAP (75° N,
162° W; 1975 m water depth) in the western Arctic Ocean. This
paper discusses on the relationship of time-series diatom fluxes to
satellite-based sea-ice motion and simulated hydrographic variations. We
observed clear maxima of the diatom valve flux in November–December of both
2010 and 2011, and in August 2011. Diatoms in samples were categorized into
98 taxa. The diatom flux maxima were characterized by many resting spores in
November–December and by the sea-ice-associated diatom Fossula arctica in August 2011.
These assemblages along with abundant clay minerals in the samples suggest a
significant influence of shelf-origin materials transported by mesoscale
eddies, which developed along the Chukchi Sea shelf break. In contrast, the
fluxes of total mass and diatoms were reduced in summer 2012. We hypothesize
that this suppression reflects the influx of oligotrophic water originating
from the central Canada Basin. A physical oceanographic model demonstrated
that oligotrophic surface water from the Beaufort Gyre was supplied to
Station NAP from December 2011 to the early half of 2012. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|