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The chemical distribution characteristics of variant form phosphorus in the seawater of the South China Sea

Acta Oceanologica Sinica 2003年第3期22卷 385-394页

作者： Jianming Pan, Chuanyu Hu, Jianfang Chen, Xiaoya Liu, Huaiyang Zhou, Weidong Ji Key Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute of Oceanography, State O-ceanic Administration, Hangzhou 310012,China. E-mail:panjianming@sio. zj.edu. cnThird Institute of Oceanography, State Oceanic Administration, Xiamen 361005,China Key Lab.Submar.Geosci.St.Ocean.Admin Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

According to two cruises investigation information in summer and winter during 1998 and 1999, the phosphorous concentration distribution and changes of summer and winter were discussed primarily in the South China Sea. The results show that the phosphate concentration of surface seawater in summer is distinctly lower than that in winter, averaging 0.04 mumol/dm(3) in summer and 0.35 mumol/ dm(3) in winter. The organic phosphorous concentration of surface seawater in summer is higher than that in winter, averaging 0.12 mumol/dm(3) in summer and 0. 04 mumol/dm(3) in winter respectively. The seasonal changes of total phosphorus are similar to phosphate, averaging 0.22 mumol/dm(3) in summer and 0.61 mumol/dm(3) in winter respectively. In vertical direction, phosphate, TDP and TP content are the lowest in upper 50 m water column, and increase in linearity rapidly with water depth, increasing slowly under 500 m, reach to maximum about 1000 m, then decrease slightly with water depth increasing. The vertical distribution is typical in summer, and there is small dispersed for phosphorus concentration for the same depth of different stations. However, in winter there is a large disperse for phosphate, TDP and TP, specifically for phosphate at 200 m at which the concentration is maximum. This result indicates that there are large differences in hydrology and biology conditions that affect largely the chemical environment of the South China Sea. The organic phosphorus is the predominant in surface seawater of the South China Sea, but the inorganic phosphorus is the predominant in layers below depth of 150 m. The organic phosphorus concentration in deep water usually decreases with water depth increasing. The organic phosphorus in summer is remarkably more than that in winter because of the strong biology activities in summer.

关键词： the South China Sea specific form phosphorus biogeochemistry processes

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