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| Titel |
Suspended particles in the Canada Basin from optical and bottle data, 2003-2008 |
| VerfasserIn |
J. M. Jackson, S. E. Allen, E. C. Carmack, F. A. McLaughlin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 6, no. 3 ; Nr. 6, no. 3 (2010-09-22), S.799-813 |
| Datensatznummer |
250003587
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| Publikation (Nr.) |
 copernicus.org/os-6-799-2010.pdf |
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| Zusammenfassung |
| It is expected that coastal erosion, upwelling, and increased river runoff
from Arctic warming will increase the concentration of suspended particles in
the Arctic Ocean. Here we analyze in situ transmissometer and fluorometer
data from the summers of 2003 through 2008 and bottle-derived particulate
organic carbon (POC) and total suspended solids (TSS) measurements sampled in
the summers of 2006 and 2007 from the Canada Basin and surrounding shelves.
We divided our study area into five regions to account for the significant
spatial variability and found that the highest attenuation, POC and TSS
values were observed along the Beaufort shelf and the lowest values were
located along the eastern shelf of the Canada Basin. We then explored the
correlation of POC and TSS with beam attenuation coefficients to assess the
viability of estimating POC concentrations from archived transmissometer
data. POC (but not TSS) and attenuation were well-correlated over the
Northwind Ridge, in the Canada Basin interior, and along the eastern shelf of
the Canada Basin. Neither TSS nor POC were well-correlated with attenuation
along the entire Beaufort shelf. An interannual comparison of the attenuation
and fluorescence data was done. We found no evidence of increasing
attenuation from the summers of 2003 through 2008 and, although not
statistically significant, it even appeared that attenuation decreased over
time in the upper 25 m of the Northwind Ridge and in the 25–100 m layer
(that includes the chlorophyll maximum) of the eastern Beaufort shelf and
within the Canada Basin. In the Canada Basin interior, the subsurface
chlorophyll maximum deepened at a rate of 3.2 m per year from an average of
45 m in 2003 to 61 m in 2008, an example of how changes to the Arctic
climate are impacting its ecology. |
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