CAJ | 학술논문

分别于夏季(2005年7月)、秋季(2005年11月)和春季(2006年4～5月)对长江口及毗邻海域进行观测,并根据水文数据、盐度与营养盐数据计算DSi余流通量.结果表明:三个季节SiO_3~(2-)平均浓度分别为54.31 μmol/L(秋季)、43.61 μmol/L(春季)和45.39 μmol/L(夏季).杭州湾区域PO_4~(3-)浓度一般比长江口高,与SiO_3~(2-)的分布情况不同,可能与悬浮物吸附与解吸附过程有关.调查区域内NO_2~- 和NH+4的浓度偏低.NO_3~-分布呈现出较好的保守性.NO_3~-占总氮的百分比平均为94.28%(夏季)、97.24%(秋季)、98.33%(春季).受陆源污染物排放的影响,在14号站位附近发现一个无机氮高于120 μmol/L的中心区.比较三个季节DSi余流通量东西分量和南北分量的绝对值,一般大潮大于小潮,表层大于底层.表层余流的方向一般向东,东南或南,底层流向主要是向西或西北.DSi的余流通量在近口门处站点较大,长江口前缘(SH1、SH2)和南缘(SH5)、杭州湾(ZJ1,ZJ2)的余流通量较大.
분별우하계(2005년7월)、추계(2005년11월)화춘계(2006년4～5월)대장강구급비린해역진행관측,병근거수문수거、염도여영양염수거계산DSi여류통량.결과표명:삼개계절SiO_3~(2-)평균농도분별위54.31 μmol/L(추계)、43.61 μmol/L(춘계)화45.39 μmol/L(하계).항주만구역PO_4~(3-)농도일반비장강구고,여SiO_3~(2-)적분포정황불동,가능여현부물흡부여해흡부과정유관.조사구역내NO_2~- 화NH+4적농도편저.NO_3~-분포정현출교호적보수성.NO_3~-점총담적백분비평균위94.28%(하계)、97.24%(추계)、98.33%(춘계).수륙원오염물배방적영향,재14호참위부근발현일개무궤담고우120 μmol/L적중심구.비교삼개계절DSi여류통량동서분량화남북분량적절대치,일반대조대우소조,표층대우저층.표층여류적방향일반향동,동남혹남,저층류향주요시향서혹서북.DSi적여류통량재근구문처참점교대,장강구전연(SH1、SH2)화남연(SH5)、항주만(ZJ1,ZJ2)적여류통량교대.
Three cruises were carried out in the Yangtze Estuary and adjacent area,in summer (July,2005),autumn (Nov.2005) and spring (April to May,2006).The Residual fluxes of DSi were calculated using the data of flow rate,flow direction,salinity and concentration of nutrients.The results show that the concentration of SiO_3~(2-) in three seasons were 54.31 μmol/L (autumn),43.61 μmol/L (spring) and 45.39 μmol/L (summer),respectively.The concentration of PO_4~(3-) in Hangzhou Bay was higher than in Yangtze Estuary,which was related to the process of adsorption and desorption of suspension.The concentration of NO_2~- and NH+4 at some stations in research area were lower than the limit of detection.NO_3~- was conservative,and its percentages of total nitrogen in three seasons were 94.28% (summer),97.24% (autumn) and 98.33% (spring).Due to the impact of pollutant discharge,a center region of high concentration of DIN was detected around station 14.Compared with vector component of residual fluxes of DSi,values of vector components are higher during spring than neap tide,but values in surface are higher than in bottom.The residual fluxes in surface are generally eastward,southeastward or southward and those in bottom are generally westward.The fluxes of near estuary are higher than those in remote area.The higher values are usually detected at SH1,SH2,SH5,ZJ1 and ZJ2.