初春(3月)黄海水体垂直混合和生物活动对水-气界面pCO_2分布的控制作用  

The Distribution of Partial Pressure of CO_2 and Its Maintaining Mechanism:Vertical Mixing Versus Biological Activity in the Yellow Sea in Early Spring

作　　者：宋美芹[1] 张龙军[1] 江春波[1] 

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2007年第S1期67-72,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金重大项目China-SOLAS(40490264)资助

摘　　要：依据2005年3月SOLAS计划第一航次调查得到的黄海表层海水二氧化碳分压(pCO_2)数据,并结合水文、化学和生物等要素的同步观测资料,重点分析了2005年初春季节整个黄海pCO_2的分布特征及其生物地球化学控制机制。本次调查的pCO_2测得值在360～640μatm之间,平均值为486μatm,表现为大气CO_2的1个源,这主要是因为,初春3月份,黄海水性仍然较多地保持着冬季海水上下垂直混合的特性,富含高CO_2的底层水不断上涌维持了表层海水较高的pCO_2,同时由于底层高无机碳和高营养盐水体的不断补充,也维持了表层较高的叶绿素a浓度。3月份黄海表层pCO_2的分布趋势明显受到以叶绿素a表征的生物活动的影响,在北黄海及沿岸流区出现了pCO_2低值区,但这种影响并不能从根本上改变pCO_2分布的源/汇格局。In combination with the cogredient data of hydrology,chemistry and biology,the data of surface water CO_2 partial pressure(pCO_2)at grid stations in the Yellow Sea(YS)in March 2005 are used to discuss the distribution of the pCO_2 and the mechanisms by which the whole sea could sustain such a level of pCO_2. The magnitude of pCO_2 ranged between 360～640μatm,the mean being 486μatm,which showed that the region acted as a source of CO_2 for the atmosphere.Mainly because the vertical mixing remained prominent hydrographic feature in early spring,the water with high concentrations of CO_2 at the bottom layer could transport to the surface layer.The phenomenon that high biological activity could change the distribution of the pCO_2 at the surface layer was also observed in the YS in March,for example,the pCO_2 is low in the northern YS and the coastal area.But biological activity could not change the source/sink pattern of the p CO_2,which was also due to the vertically homogeneous structure.

关 键 词：黄海 二氧化碳分压 垂直混合 生物活动 

分 类 号：P734.2[天文地球—海洋化学]