2008年夏末南海北部叶绿素a的空间分布特征及其影响因素*

doi:10.11978/j.issn.1009-5470.2013.04.008

热带海洋学报 ›› 2013, Vol. 32 ›› Issue (4): 51-57.doi: 10.11978/j.issn.1009-5470.2013.04.008cstr: 32234.14.j.issn.1009-5470.2013.04.008

2008年夏末南海北部叶绿素a的空间分布特征及其影响因素^*

柯志新, 黄良民, 谭烨辉, 周林滨, 张建林

中国科学院南海海洋研究所海洋生物资源可持续利用重点实验室, 广东广州 510301

收稿日期:2011-08-29 修回日期:2012-06-08 出版日期:2013-10-20 发布日期:2013-10-30
通讯作者: 黄良民。E-mail: hlm@scsio.ac.cn
作者简介:柯志新(1976—), 男, 湖北省武穴市人, 博士, 从事海洋生态学研究。E-mail: kzx@scsio.ac.cn
基金资助:
中国科学院创新方向项目(KZCX2-YW-Q07)

Spatial distribution of chlorophyll a and its relationships with environmental factors in northern South China Sea in late summer 2008

KE Zhi-xin, HUANG Liang-min, TAN Ye-hui, ZHOU Lin-bin, ZHANG Jian-lin

Key Laboratory of Marine Bio-resource Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received:2011-08-29 Revised:2012-06-08 Online:2013-10-20 Published:2013-10-30

摘要/Abstract

摘要： 2008年8月至9月对南海北部71个站位进行了叶绿素a的空间分布调查。调查结果显示叶绿素a在不同水层的水平分布差异很大。表层和25m层的叶绿素a浓度分布极度不均匀, 基本沿西北向东南方向逐渐减小。粤东近海表层叶绿素a浓度高值超过2µg·L^-1, 而南海北部表层和25m处的叶绿素a平均分别仅为0.15和0.11µg·L^-1。在东沙西南和琼东近岸的25m和50m处均出现了叶绿素高值。100—200m层的叶绿素a的水平分布规律与上层不同, 受黑潮影响的吕宋海峡附近的站位的叶绿素值明显高于其他海区。叶绿素a的垂直分布模式随站位深度存在较大的差异: 在水深为50—200m的站位中, 多数测站的叶绿素最大值出现在50m处, 而且峰值比较突出; 而在水深>200m的站位中, 叶绿素最大值一般出现在50m至75m之间, 峰值比较平缓。珠江冲淡水向东北偏转和粤东上升流涌升水应该是造成粤东近岸叶绿素a值异常升高的主要原因。从温盐垂直分布来看, 次表层叶绿素最大值深度与水体的混合层深度密切相关。在南海北部寡营养盐水体中, 上层水体叶绿素a和营养盐的关系比较复杂, 营养盐与叶绿素a浓度在不同水层表现出不同的相关性。生物吸收作用和海水的物理运动对叶绿素与营养盐的关系可能都会产生较大的影响。

关键词: 南海北部, 叶绿素a, 空间分布, 营养盐

Abstract: The spatial distribution of chlorophyll a was investigated in northern South China Sea in late summer 2008. The horizontal distribution of chlorophyll awas basically heterogeneous at the surface and 25-m depth, decreasing from northwest to southeast. Maximum value of chlorophyll a was more than 2µg·L^-1 at the coastal station of eastern Guangdong province. The average concentrations of chlorophyll a were only 0.15 and 0.11µg·L^-1 at the surface and 25 m of northern South China Sea, respectively. Chlorophyll a showed a high value in 25 and 50 m in the southwest of Dongsha Island and east of Hainan Island. In the layer of 100-200 m, the concentration of chlorophyll a was obviously higher nearby the Luzon Strait, where influence by the Kuroshio was present. The vertical distribution patterns of chlorophyll a were different between sampling stations with different bottom depths. At the shallow water stations (50-200 m), the depth of maximum chlorophyll a generally appeared at 50 m with an outstanding peak; at the deep-water stations (> 200 m), the depth of maximum chlorophyll a was between 50 and 75 m with a gentle peak. According to the data of temperature and salinity, the high chlorophyll a in the coastal region of eastern Guangdong province should be caused by the northeastward Zhujiang River discharge and coastal upwelling. The mixed layer depth should be an important factor influencing the depth of deep maximum chlorophyll a. In the oligotrophic northern South China Sea, the relationship between chlorophyll a and nutrients was complicated in the upper layer. In the layer of 0-75 m, chlorophyll a positively related with NO₂, NH₄ and DIP(dissolved inorganic phosphorus, DIP), while negatively related with NO₃ and SiO₃. In the layer of 100-200 m, chlorophyll a negatively related with nutrients. Bio-uptake of phytoplankton and physical movement of ocean flow all can have a great influence on the relationship between chlorophyll a and nutrients.

Key words: northern South China Sea, chlorophyll a, spatial distribution, nutrient

中图分类号:

P735.1

柯志新, 黄良民, 谭烨辉, 周林滨, 张建林. 2008年夏末南海北部叶绿素a的空间分布特征及其影响因素^*[J]. 热带海洋学报, 2013, 32(4): 51-57.

KE Zhi-xin, HUANG Liang-min, TAN Ye-hui, ZHOU Lin-bin, ZHANG Jian-lin. Spatial distribution of chlorophyll a and its relationships with environmental factors in northern South China Sea in late summer 2008[J]. Journal of Tropical Oceanography, 2013, 32(4): 51-57.

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2008年夏末南海北部叶绿素a的空间分布特征及其影响因素^*

Spatial distribution of chlorophyll a and its relationships with environmental factors in northern South China Sea in late summer 2008

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