摘要
研究长江口外海域夏季低氧区的动态特征具有重要的科学意义和应用价值。通过对长江口外低氧区典型月份历史资料以及该海域生态环境演变的分析,揭示了长江口外海域低氧区北移、氧最低值波动下降和低氧区面积扩大的年代际变化趋势,阐明了低氧区的演变与富营养化以及海洋动力环境之间的关系,并对2006年夏半年(6-10月)低氧区的位置变化过程进行了具体分析。研究表明,长江口外低氧区北移主要受富营养化以及水文动力因素变化控制,低氧区北向扩展趋势的增强是长江口外海域生态环境长期演变的结果,黑潮分支台湾暖流的增强以及与之相关的上升流区的北移对低氧核心区位置的年代际变化具有至关重要的作用;长江口外海域流场的逐月变化以及浮游植物生物量高值区的变动在一定程度上影响着夏半年低氧区的位置变化。
The research and analysis on the dynamic characteristics of the hypoxic zone adjacent to the Changjiang Estuary are of greatly scientific and practical significance to the sustainable development of the Changjiang River Delta.Through the analysis on the historical data in typical months of the hypoxic zone and the marine ecological environment evolution off the Changjiang Estuary,the trends that the hypoxic zone moved northward,dissolved oxygen minimum value volatility decreased and the hypoxic area was growing were fully revealed from the time scale,meanwhile,the relationships between the evolution of the hypoxic zone and the eutrophication and the hydrodynamic environment were expounded,besides,the changing process of the hypoxic zone location in different months in summer half year（June—October）of 2006 was also discussed.The results show that the trend that the hypoxic zone moved northward（that is,the hypoxic zone extended to the southwestern area of the southern Huanghai Sea）was dominated by the eutrophication and the hydrological power variation,the enhanced northward expansion trend was a result of the long-term evolution of the ecological environment adjacent to the Changjiang Estuary,the enhancement of the Taiwan Warm Current and the northward moving of the upwelling area associated to it play a crucial role in the decadal variability of the core location of the hypoxic zone;the monthly variation of the currents and the changing of the phytoplankton biomass intensive areas adjacent to the Changjiang estuary affected the hypoxic zone location in summer half year to some extent.
出处
《海洋学报》
CAS
CSCD
北大核心
2011年第6期100-109,共10页
基金
我国近海海洋综合调查与评价专项课题"ST03区快水体环境调查与研究"(908-01-ST03)
"近海环流变异对主要渔场形成和变迁的影响"(908-02-01-03)
联合国发展计划署全球环境机构(UNDP/GEF)减少黄海大海洋生态系统压力项目(E-I-08-sumjcchneco-2121)~~
关键词
长江口
低氧区
动态特征
北移
富营养化
水文动力因素
Changjiang Estuary
hypoxic zone
dynamic characteristics
northward moving
eutrophication
hydrodynamics
