摘要
根据台风"圆规"过境长江河口前后24个大面站位的现场调查,分析了各站位台风前后N、P、Si等营养盐浓度与叶绿素活性荧光值变化。结果表明:在台风"圆规"带来的大量降水及其引起的水体水平输运和垂直混合作用下,长江河口的温、盐结构与营养盐分布出现了改变。所选断面的温跃层与盐跃层位置在台风过后变深,层结强度减弱。DIN和SiO3-Si浓度整体增加明显,PO4-P由于在近岸水域中底层被吸附较多,导致其浓度在近岸有所降低,但在靠外的水域浓度出现增加。"圆规"过后长江河口DIN、PO4-P与SiO3-Si分别增加了3.87×109mol、0.13×109mol与4.70×109mol。同时,河口叶绿素活性荧光的最大荧光强度值变大,次表层叶绿素最大浓度带位置加深,层厚度增大。上述研究表明台风过境对长江河口营养盐的输送通量及生物生产有显著的影响。
Based on the field observation in the Yangtze River Estuary before and after the typhoon ＂Kompasu＂. The concentrations of nutrients and active fluorescence of chlorophyll were analyzed at 24 sampling points. The results show that the temperature, salinity and nutrients changes were largely due to the typhoon which brought heavy rainfall to the Yangtze River Estuary and caused the horizontal transport and vertical mixing in the water body. The depth of thermocline and halocline descended after the typhoon, and their stratifi- cations got weaker than before. The concentrations of dissolved inorganic nitrogen and silicate were increased significantly after the ty- phoon ＂Kompasu＂, phosphate concentration were decreased in the near-shore waters because of the adsorption, but it was increased in the offshore waters. The fluxes of dissolved inorganic nitrogen, phosphate and silicate were increased, 3.87 ×10^9 mol, 0.13×10^9 mol and 4.70 × 10^9 tool respectively in the Yangtze River Estuary after ＂Kompasu＂. hile, the position of subsurface chlorophyll maximum became much deeper and its layer thickness increased after the typhoon. These phenomenons indicate that typhoon has important influ-ence on the fluxes of nutrients and biological production in the Yangtze river estuary.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2012年第6期860-866,共7页
Marine Environmental Science
基金
科技部项目全球变化重大科学研究计划(2010CB951203)
上海市科委知识创新项目(10JC1404400)
华东师范大学河口海岸学国家重点实验室科研业务课题(2009KYYW03
2010RCDW14)
关键词
长江河口
台风
营养盐
活性荧光
Yangtze River Estuary
typhoon
nutrients
active fluorescence
