南沙海域上层海水碳垂直通量的初步研究

THE VERTICAL CARBON FLUX OF EPIPELAGIC WATER IN THE NANSHA AREA OF THE SOUTH CHINA SEA

根据1990年5—6月在南沙海域4个站点投放颗粒物捕集器采集样品的分析结果，计算了该海域上层海水碳垂直通量。结果表明：（1）南沙海域上层海水颗粒有机碳总生成量为298mg／（m2·d），其中35％分解参与再循环，65％以颗粒形式离开真光层向下输送；（2）颗粒有机碳向下通量为193mg／（m2·d），总溶解无机碳穿过跃层向上垂直通量为3600mg／（m2·d），真光层颗粒无机碳向下通量为27mm／（m2·d），大气进入海洋的海气界面二氧化碳通量为13mg／（m2·d）。

The downward flux of particulate organic carbon (DPOC) and particulate orga-nic nitrogen (DPON) in the upper 80 m of the water column was measured usingsediment traps at four sites in the Nansha Islands area of the South China Sea inMay-June 1990. The total production of DPOC in the euphotic layer was 298mg/(m2·d), of which 35 % was decomposed and recycled and 65% was particulateform transported downward to the deeper layer. The upward flux of total dissolvedinorganic carbon passing through the thermocline was 3 600 mg/(m2·d), the downwardflux of DPOC was 193mg/(m2·d), the downward flux of particulate inorganic ca-rbon in the euphotic layer was 27mg/(m2·d), and the carbon dioxide flux across theair-sea interface into the Ocean was 13 mg/(m2·d).