劉康克2006-08-232018-06-282006-08-232018-06-282000http://ntur.lib.ntu.edu.tw//handle/246246/29302本計畫的目的是探討季風及其它物理作用對南海生 地化之影響。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.application/pdf35569 bytesapplication/pdfzh-TW國立臺灣大學海洋研究所南海生地化季風錨碇模式同位素South China Seabiogeochemistrymonsoonsmooringsmodelingstable isotopesreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/29302/1/892611M002004OP1.pdf