摘要
通过修订的VGPM模型,利用南海北部7年平均SeaWiFS和AVHRR遥感资料,分析了该海域河口上升流及反气旋涡等生境表层叶绿素浓度和初级生产力的周年变化,结果表明,季风驱动下的物理-生物海洋学耦合过程是控制研究海域浮游植物生物量和初级生产力时空变化的主导因素。浮游植物生物量和初级生产力随着季风、环流以及中尺度涡等物理现象的更替而呈现出明显的区域差异和季节变化,其高值一般出现在珠江口和沿岸上升流区,而低值则出现在外陆架反气旋涡和海域南端,往往伴随东北季风的盛行而升高,随西南季风的增强而降低。通过遥感资料估算得到南海北部海域年平均初级生产力为165.6 g/(m2.a)(以碳计),浮游植物年固碳量为4.83×107t/a(以碳计),其中每年最多约有1.9×107t碳向真光层外输出。
Based on an improved VGPM model and 7 years average data from SeaWiFS and AVHRR, the annual variation of surface chlorophyll a and primary production in different environments （e. g. estuary, upwelling and eddies） in the northern South China Sea （nSCS） was analyzed in this study. The results show that the physical-chemical-biological coupling processes driven by monsoon are the main factor controlling the spatial-temporal variation of phytoplankton biomass and primary production. With the changes of physical features （e. g. monsoon, circulation and eddies）, chlorophyll a and primary production show great variation. The high values appeared in the Peal River Estuary and coastal zone and the low ones appeared in the shelf anti-cyclonic eddies and the open sea. According to their temporal change, in most cases, the phytoplankton biomass and primary production are high when the northeast monsoon prevails and low when the southwest monsoon does. In general, the chlorophyll a and primary production in the study area decrease with water depth increasing from coastal area, continental area to open sea. In the coastal area with water depth lower than 50 meters, both chlorophyll a and primary production maintain at a high level, with chlorophyll a higher than 1 mg/m^3, and primary production higher than 600 mg/（m^2·d）. And the high chlorophyll a and primary production exhibit clumped distribution. In the coastal zone and inner continental shelf, chlorophyll a and primary production decrease rapidly with water depth increasing. However, the decrease gradually slows down in open sea. The lowest chlorophyll a and primary production appears on the most southern part of the study area. It is also observed that chlorophyll a and primary production show apparent seasonal changes, and the seasonal changes are different in different zones. In the coastal zone, the distribution of chlorophyll a shows a double peak curve, with higher values in winter and summer, but lower in spring and autumn. While, primary producti
出处
《海洋学研究》
2011年第2期46-57,共12页
Journal of Marine Sciences
基金
国家自然科学基金重大研究计划资助项目(900701006)
国家自然科学基金青年基金资助项目(40506032)
国家海洋局第二海洋研究所基本科研业务费专项资助项目(JG200816)
关键词
南海北部
叶绿素A
初级生产力
遥感
固碳量
物理-生物耦合过程
northern South China Sea
chlorophyll a
primary production
remote sensing
carbon fixation
physical-biological coupling processes
