黄海溶解无机氮及颗粒有机氮收支与转化模型

为了解黄海氮营养盐的循环规律与收支情况，利用一个高分辨率物理-生物地球化学耦合模型（ECSECOM），模拟了黄海溶解无机氮（DIN）、颗粒有机氮（PON）的循环收支情况，分析了各源汇项的空间分布特征及季节变化规律及不同形态之间转化规律.结果表明：黄海DIN浓度在春、夏季较低，秋、冬季恢复至高水平.PON浓度在冬、春季较低，在夏、秋季有升高的趋势.浮游植物光合作用和呼吸作用是DIN最主要的汇和源，初级生产消耗的DIN中29.47%由水体内碎屑物质矿化分解提供，外源输入的DIN占总浮游植物生长需求的14.60%.浮游植物死亡是PON最大的源，沉积物为PON的净汇.大气氮沉降对黄海的影响范围全面，底沉积物释放和河流输入的DIN对黄海的影响是局地的.从PON与DIN之间的循环转化来看，PON中有48.50%转化为DIN，其余大部分都沉积到海底界面，而DIN向PON的转化率为38.85%.

Budgets and transformation of dissolved inorganic and particulate organic nitrogen in the Yellow Sea: A model study

To study the cycles and budgets of nitrogen in the Yellow Sea, a three-dimensional coupled biophysical model (ECSECOM) was established to simulate the cycles and budgets of dissolved inorganic nitrogen (DIN) and particulate organic nitrogen (PON) in the Yellow Sea and to analyze the spatial distributions and seasonal variations of sources and sinks of DIN and PON. The DIN concentration decreased through spring and summer and reached the high value in autumn and winter. The concentration of PON was low in winter and spring, and increased in summer and autumn. Regarding the budgets of DIN, primary production and respiration of phytoplankton were the most important sink and source of DIN. The remineralization of the detritus pool compensated 29.47% of the consumption of DIN by the primary production process, while external input of DIN accounted for 14.60%. The major source of PON was the mortality release of phytoplankton. The exchange of sediment-water interface of PON showed a net sedimentation. The input of DIN from atmospheric deposition to the Yellow Sea was comprehensive, and the area affected by the bottom interface release and river loading were regional. The transformation rate between DIN and PON was also calculated. There were 48.50% of PON converting to DIN, the most of the rest PON deposited to the sediment. The transformation rate from DIN to PON was 38.85%.