黄海中部营养盐的贯跃层输运  

Nutrient Transport Across the Thermocline in the Central Yellow Sea

作　　者：魏皓[1] 王磊[1] 林以安[2] CHUNG Chang-Soo 

机构地区：[1]青岛海洋大学物理海洋研究所 [2]国家海洋局第二海洋研究所,浙江杭州310001 [3]韩国海洋研究所

出　　处：《海洋科学进展》2002年第3期15-20,共6页Advances in Marine Science

基　　金：国家重点基础研究发展规划项目--东黄海生态系统动力学与生物资源的可持续利用(G1999043703)资助

摘　　要：黄海中部层化季节上下混合层的温差远高于其他近岸海区,温跃层较强,但通过湍流卷挟仍存在贯跃层物质输运。根据从能量平衡出发的混合层理论模型,计算了黄海中部上、下层的卷挟速度,根据3个航次调查资料,定量估计了层化季节贯跃层的营养盐输运。结果表明:下层黄海冷水团是真光层的营养盐储库,通过湍流卷挟夏季可带来15.9mgC·m-2·d-1的新生产,半个月之内它可以更新上层海洋的营养盐,与大气氮输入作用同量级,远大于大气磷输入;春秋两季贯跃层输入比大气氮输入更为重要,春秋季前者带来的新生产分别为初级生产力的21%和30%,而大气氮输入带来的新生产春季为初级生产的5.7%,秋季为初级生产的9.5%。在整个层化季节营养盐的贯跃层输运带来的新生产在整个初级生产中可能占有很大份额。秋末强风过程带来的强湍流卷挟,可在一周之内更新上层海洋的营养盐,并在风停后刺激上层初级生产的增加。The difference between the temperatures in the upper and lower mixing layers in the Yellow Sea in the stratified season is much greater than that in other coastal areas, but there is still the mass transport across the strong thermocline by means of turbulent entrainment. Based on a mixing layer model, the entrainment velocities in the upper and lower layers in the Yellow Sea were calculated, and the observed data during 3 cruises were used to quantatively estimate the nutrient transport across the thermocline in the stratified season. It is shown from the calculation results that the lower layer water, named the Yellow Sea Cold Water Mass(YSCWM), is the storage pool of nutrient for the photic zone, which can bring about 15.9 mgC·m-2·day-1 new production to the upper layer in summer and replenish the upper layer with nutrients within half a month. Compared with the atmospheric nutrient input, the entrainment of nutrients from the lower layer is more important during the stratified season. The new production brought to the upper layer by entrainment is 21 % of the primary production in the upper layer in spring and 30 % of that in autumn, but the new production brought to the upper layer by atmospheric nitrogn input is only 5.7 % of the primary production in upper layer in spring and 9.5 % of that in autumn. The strong turbulent entrainment caused by the strong wind process in late autumn can refresh the nutrient in the upper ocean in a week and stimulate the increase in primary production in the upper layer.

关 键 词：营养盐 贯跃层输运 混合层理论模型 冰水团 温度 黄海 

分 类 号：P734.44[天文地球—海洋化学]