南海生地化整合研究(I)─子計畫三：南海上層水體之物理─生地化耦合研究：錨錠觀測系統、同位素地化及數值模式之運用(I)
Date Issued
2000
Date
2000
Author(s)
劉康克
DOI
892611M002004OP1
Abstract
The purpose of this project is to study how monsoons
and other physical forcings affect the biogeochemistry
of the South China Sea. Specifically, this project
employs three approaches: (1) moored sensors and
measuring devices for physical and biogeochemical
parameters, (2) isotopic compositions of carbonaceous
and nitrogenous materials in the water column, and (3)
numerical modeling. The rather diverse approaches of
this project are meant to serve as versatile vehicles for
collaborative studies. Due to the long purchasing
procedure, only recently the moored sensors were
deployed. Two mooring strings were deployed at the
South East Asia Time-series Station (SEATS, 18.25o
N, 115.58o E) in October 2000. One string includes an
Acoustic Doppler Current Profiler (RDI BW-150-HP)
and a mini-CTD (SEACAT SBE-16). The other
includes eight temperature sensors and two pressuretemperature
composite sensors. The moorings will be
replaced every 4-6 months. Nitrogen isotopic
compositions of nitrate were analyzed for seawaters
collected from 50-900 m at the mooring station. Below
the euphotic zone, the d15N values appear to be
normal (4.4-6.2 permil). However, the lowest value
corresponds to a maximum in N/P ratio, suggesting an
influence from the phyto-detritus of nitrogen fixers.
Within the euphotic zone, the nitrate is enriched in
15N, apparently resulting from preferential uptake of
the isotopically light nitrate by phytoplankton. The 3-
D numerical model with coupled physicalbiogeochemical
processes for the South China Sea is
capable of producing seasonal variations in
chlorophyll and nitrate distributions, which are
partially supported by the observations of the SEATS
cruises. More rigorous formulation and
parameterization of the biogeochemical processes
employed in the coupled model are needed in the
current development of the model.
Subjects
South China Sea
biogeochemistry
monsoons
moorings
modeling
stable isotopes
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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