Phosphorus cycling in the upper ocean of the East China Sea using natural <sup>32</sup>P and <sup>33</sup>P

ZHANG Yuan-hui; YIN Ming-duan

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ZHANG Yuan-hui, YIN Ming-duan. Phosphorus cycling in the upper ocean of the East China Sea using natural 32P and 33P[J]. Haiyang Xuebao, 2007, 29(1): 49-57.

Citation:

ZHANG Yuan-hui, YIN Ming-duan. Phosphorus cycling in the upper ocean of the East China Sea using natural ³²P and ³³P[J]. Haiyang Xuebao, 2007, 29(1): 49-57.

ZHANG Yuan-hui, YIN Ming-duan. Phosphorus cycling in the upper ocean of the East China Sea using natural 32P and 33P[J]. Haiyang Xuebao, 2007, 29(1): 49-57.

Citation:

ZHANG Yuan-hui, YIN Ming-duan. Phosphorus cycling in the upper ocean of the East China Sea using natural ³²P and ³³P[J]. Haiyang Xuebao, 2007, 29(1): 49-57.

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Phosphorus cycling in the upper ocean of the East China Sea using natural ³²P and ³³P

Key Laboratory of Marine Atmospheric Chemistry and Global Change, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received Date: 2006-09-01
Rev Recd Date: 2006-12-11

Abstract

Abstract

Natural activities of 32P (t_1/2=14.3 d) and ³³P (t_1/2=25.3 d) in total dissolved P(TDP), suspended particulate matter, net-plankt on and rainwater during the spring of 2001 were measured by anultra-low level liquid scintillation counter.A continuous steady-state model was used to estimate residence times of various phosphorus pools, uptake rates of the biological food chain within the upper ocean of the East China Sea.³²P/³³Pratios increased from the dissolved pools to the suspended matter and to net-plankton, reflecting that the age Of Pincreased as one moved up through the food chain.The residence time of P in the dissolved pools of coastal water and mid-shelfarea were very short (3~4 d), which suggests thatlow phosphorus concentrations could support relatively high levels of primary production.A phytoplankton assimilating flux of 189~814 mg/(m²·d) and a zooplankt on grazing flux of 10~161 mg/(m²·d) were also estimated and show that grazing rates of carbon correspo nded to 3%~20% of primary production.In addition, the particulate organic carbon fluxes from the upper ocean were calculated by directly comparing the measured seawater inventory of ³²P and ³³P with that measured in rain, and were found to range between 102 and 972 mg/(m²·d).
- ³²P,
- ³³P,
- residence time,
- uptake rate,
- export flux,
- East China Sea,
- Huanghai Sea

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