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| Titel |
Monthly measured primary and new productivities in the Ulleung Basin as a biological "hot spot" in the East/Japan Sea |
| VerfasserIn |
J. H. Kwak, S. H. Lee, H. J. Park, E. J. Choy, H. D. Jeong, K. R. Kim, C. K. Kang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-01), S.4405-4417 |
| Datensatznummer |
250018320
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| Publikation (Nr.) |
 copernicus.org/bg-10-4405-2013.pdf |
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| Zusammenfassung |
| The Ulleung Basin (UB), located in the southwestern part of the East/Japan
Sea (EJS), is considered having an unusually high productivity for a deep
basin. Recently changes have been reported in physical, chemical, and
biological properties. Here we measured the primary and new productivities
in the UB using a 13C-15N dual isotope tracer technique.
Measurements took place every month for the first time throughout a year for
a better estimate of the annual primary production in the EJS. Temporal
variations of temperature, salinity, and density (σt) in the
study area were highly seasonal as expected for an ocean in the temperate
zone. Nutrient distributions reflected these seasonal fluctuations in the
vertical structure of the water column. Diatoms were in general the most
dominant phytoplankton ranging from 15.5 to 82.2% with an average of
42.0% (S.D. = ±9.9%). Based on those average daily
productivities from our monthly measurements, the annual primary, new, and
regenerated production in the UB were 273.0 g C m−2 yr−1,
62.6 g N m−2 yr−1, and 48.7 g N m−2 yr−1, respectively. Our
estimated high f ratio (0.59) in the UB, indicated that the predominant
nitrogen source for primary production was nitrate. This is comparable with
the nitrogen source in a productive coastal-upwelling region. New carbon
production by phytoplankton is estimated as 145.6 g C m−2 yr−1
(S.D. = ±40.8 g C m−2 yr−1) which indicates that a large
portion (53.9%) of the total annual primary production might potentially be
exported from the diatom-dominated euphotic zone to a deeper zone in the UB.
Further intense integrated field observations will be necessary to improve
our understanding of the current marine ecosystem in the UB as an important
biological production area in the EJS. |
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