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| Titel |
A newly observed physical cause of the onset of the subsurface spring phytoplankton bloom in the southwestern East Sea/Sea of Japan |
| VerfasserIn |
Y.-T. Son, K.-I. Chang, S.-T. Yoon, T. Rho, J. H. Kwak, C. K. Kang, K.-R. Kim |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2014-03-04), S.1319-1329 |
| Datensatznummer |
250117272
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| Publikation (Nr.) |
 copernicus.org/bg-11-1319-2014.pdf |
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| Zusammenfassung |
| An ocean buoy, UBIM (Ulleung Basin Integrated Mooring), deployed during the spring transition from February
to
May 2010 reveals for the first time highly resolved temporal variation of
biochemical properties of the upper layer of the Ulleung Basin in the
southwestern East Sea/Sea of Japan. The time-series measurement captured the onset
of subsurface spring bloom at 30 m, and collocated temperature and current
data gives an insight into a mechanism that triggers the onset of the spring
bloom not documented so far. Low-frequency modulation of the mixed layer
depth ranging from 10 m to 53 m during the entire mooring period is mainly
determined by shoaling and deepening of isothermal depths depending on the
placement of UBIM on the cold or warm side of the frontal jet. The
occurrence of the spring bloom at 30 m is concomitant with the appearance of
colder East Sea Intermediate Water at buoy UBIM, which results in
subsurface cooling and shoaling of isotherms to the shallower depth
levels during the bloom period than those that occurred during the pre-bloom
period. Isolines of temperature-based NO3 are also shown to be uplifted
during the bloom period. It is suggested that the springtime spreading of
the East Sea Intermediate Water is one of the important factors that
triggers the subsurface spring bloom below the mixed layer. |
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