37°N断面营养盐和溶解氧的四季分布特征及变化

Seasonal distribution features of nutrients and DO at 37°N transect

以2006年7月至2007年10月期间,4个季节的4个航次对37°N断面的调查资料为依据,分析并讨论了该断面四季生源要素的分布特征以及变化趋势。结果表明:该断面受黄海冷水团和陆源输入的影响,东西两侧的生源要素及温盐特征明显不同。夏季断面东侧由于受到冷水团的控制,底层出现明显的低温、高盐、高营养盐和高溶解氧的特征,并且跃层明显;西侧浅水区的温盐及生源要素的变化则相对均匀。冬季由于温跃层的消失,上下水体混合均匀,故而温盐及生源要素的垂直分布趋于均匀,断面西侧由于受到陆源输入的影响营养盐的浓度明显较东侧高。春季是增温降盐,营养盐逐渐消耗,东侧温跃层逐渐形成的过程;而秋季则恰恰相反。

Based on the four cruises carried out at 37°N transect from July 2006 to October 2007 in four seasons. The distribution features of biogenic elements at this section and it＇s changes were discussed. The results showed that： Influenced by the Huanghai Sea Cold Water Mass and inshore area input, the biogenic elements temperature and salinity have obviously differences at this transect. In summer, the east of this section was controlled by the cold water mass, where had features of lower temperature, higher salinity and higher concentration of biogenic elements. In the west the variation of all factors were more equably. In winter, thermocline faded lead all factors in this transect were vertically uniform. The west had higher concentrations of nutrient elements than that in the east, because of the influence of inshore areas input. In spring, the temperature increased and salinity decreased, while the nutrient elements were consumed, the thermocline and halocline grown up; these were conversely in the autumn.