1997—2007年东海叶绿素a质量浓度的时空变化分析  

Temporal-spatial Change of Concentration of Chlorophyll-a in the East China Sea During 1997-2007

作　　者：伍玉梅[1] 徐兆礼[1] 崔雪森[1] 樊伟[1] 

机构地区：[1]中国水产科学研究院东海水产研究所渔业资源遥感信息技术重点开放实验室,上海200090

出　　处：《环境科学研究》2008年第6期137-142,共6页Research of Environmental Sciences

基　　金：国家自然科学基金重大研究计划项目(90511005);我国近海海洋综合调查与评价专项(908-02-01-03);国家"十一五"科技支撑计划项目(2006BAD09A05);中央级公益性科研院所基本科研业务费专项资金(中国水产科学研究院东海水产研究所)资助项目(2007T09)

摘　　要：分析了1997—2007年由SeaWiFS卫星获得的我国东海ρ(叶绿素a)的时空变化特点.结果表明,ρ(叶绿素a)多年平均值在近海明显高于外海,近海往外快速递减,最高值位于长江口大沙滩.东海ρ(叶绿素a)呈明显的年周期性变化,波峰基本出现在3—4月,波谷在7—8月.在近11年间,ρ(叶绿素a)及距平呈下降趋势,最显著的是在东海近海海区.ρ(叶绿素a)及距平的变化具有明显的区域性,东海北部近海多年的月均值最高〔ρ(叶绿素a)>2.0mg/m3〕,南部近海和台湾海峡次之(0.8～2.0mg/m3),东海北部和南部外海最小〔ρ(叶绿素a)<1.0mg/m3〕.近海主要受到陆地径流带来富营养盐的影响,ρ(叶绿素a)高、变化幅度大、周期短,东海外海及台湾海峡主要受到高温寡营养盐的黑潮及其分支影响,ρ(叶绿素a)低、变化幅度小、周期长.The temporal-spatial changes of chlorophyll-α concentration [ ρ （chl-a）] obtained by SeaWiFS in the East China Sea （ECS） during 1997-2007 were analyzed. The results showed that the annual average ρ（chl-a） in the inshore area was much higher than that in the offshore; the average sharply decreased from inshore to offshore; and the highest ρ（chl-a） was located in the estuary of the Yangtze River. In the ECS, ρ （chl-a） showed a significant annual cycle, reaching the highest in March and April and the lowest in July and August every year. In the recent 11 years, ρ（chl-a） and annual anomalies decreased in the ECS, especially in the inshore, ρ（chl-a） was the highest （ 〉 2.0 mg/m^3 ） in the north inshore, and was higher （0.8-2.0 mg/m^3 ） in the south inshore and the Taiwan Strait, and was the lowest （ 〈 1.0 mg/m^3 ） in the north and south offshores. The ρ（chl-a） in the inshore of the ECS was mainly affected by the rich nourishment brought by the land flows, which resulted in high ρ（chl-a）, great change and short period,ρ（chl-a） in the offshore and Taiwan Strait was largely impacted by the Kuroshio and its offset, which resulted in low ρ（chl-a）, little change and long period.

关 键 词：东海 SEAWIFS 叶绿素A 谱分析 

分 类 号：X55[环境科学与工程—环境工程]