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通过对南海北部2009—2010年获得的浅层、中层和深层时间系列沉积物捕获器的样品分析,发现浮游有孔虫总通量和主要属种Globigerinoidesruber,Globigerinoidessacculifer,Pulleniatinaobliquiloculata和Neogloboquadrinadutertrei的通量和百分含量存在明显的季节性变化,在东北季风和西南季风盛行期出现高值,特别在冬季风期间高值明显,在季风间歇期出现低值,展示出“双峰型”通量模式。浮游有孔虫通量与颗粒总通量、有机碳通量、总碳通量、总氮通量、碳酸钙通量和蛋白石通量变化一致,随叶绿素a浓度和风速大小变化而改变,表明南海北部生源颗粒通量主要受季风影响的表层生产力所控制。浮游有孔虫壳体氧同位素与表层海水温度的季节变化相吻合。壳体δ18 O主要受海水温度变化的影响,不同深度属种的δ18 O变化反映了上层海水温度梯度。此外,壳体碳同位素值总体上在东亚季风强盛期低、季风间期高,与表层海水中叶绿素a浓度和海表风速的变化趋势相反,说明浮游有孔虫δ13 C值反映了水体营养和表层生产力的变化。
Through the sample analysis of shallow, middle and deep time series sediment traps obtained from 2009 to 2010 in the northern South China Sea, the total flux of planktonic foraminifera and the fluxes of the major genera Globigerinoidesruber, Globigerinoidessacculifer, Pulleniatina obliquiloculata and Neogloboquadrinuteutere are found There were obvious seasonal changes in the content of sub-monsoon and high values in the northeast monsoon and southwesterly monsoon, especially during the winter monsoon period and low during the monsoon interval, showing a “bimodal” flux pattern . The planktonic foraminifer flux was consistent with the changes of total flux, organic carbon flux, total carbon flux, total nitrogen flux, calcium carbonate flux and opal flux, and changed with the change of chlorophyll a concentration and wind speed The flux of primary source particles in the northern South China Sea is dominated by surface productivity that is affected by the monsoon. The oxygen isotope of planktonic foraminifera coincides with the seasonal change of surface seawater temperature. The δ18 O of the shell is mainly affected by the change of seawater temperature. The δ18 O variations of the genera of different depths reflect the temperature gradient of the upper seawater. In addition, the δ13C value of the planktonic foraminifera reflected the changes of water body nutrition and water content in the whole seafloor. The δ13C value of the planktonic foraminifera reflected the change of chlorophyll a concentration and sea surface wind speed in the surface seawater, Changes in surface productivity.