1999年和 2009 年夏季珠江口环境要素的对比与分析

doi:10.11978/j.issn.1009-5470.2011.04.016

热带海洋学报 ›› 2011, Vol. 30 ›› Issue (4): 16-23.doi: 10.11978/j.issn.1009-5470.2011.04.016cstr: 32234.14.j.issn.1009-5470.2011.04.016

1999年和 2009 年夏季珠江口环境要素的对比与分析

杨威 1,2, 罗琳 1, 高永利 1, 俎婷婷 1, 周巍 1, 王东晓 1

1．热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东广州 510301; 2.中国科学院研究生院, 北京 100049

收稿日期:2010-04-08 修回日期:2010-08-03 出版日期:2011-09-05 发布日期:2011-09-08
通讯作者: 王东晓。E-mail: dxwang@scsio.ac.cn
作者简介:杨威(1986—), 男, 安徽省滁州市人, 硕士研究生, 主要从事近海环境及水动力学研究。E-mail: yangwei@scsio.ac.cn。
基金资助:
国家自然科学基金委-广东联合基金重点项目(U0733002); 广东省重大科技专项(2007A032600002); 中国科学院南海海洋
研究所青年人才领域前沿项目(SQ200810)

Comparison of environmental constituents in the Pearl River Estuary during summer of 1999 and 2009

YANG Wei1, 2, LUO Lin1, GAO Yong-li1, ZU Ting-ting1, ZHOU Wei1, WANG Dong-xiao1

1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, CAS), Guangzhou 510301, China;
2. Graduate University of CAS, Beijing 100049, China

Received:2010-04-08 Revised:2010-08-03 Online:2011-09-05 Published:2011-09-08

摘要/Abstract

摘要：

对1999 年和2009年夏季珠江口的温、盐、溶解氧、叶绿素和径流量等数据进行分析。结果表明, 由于1999年
航次期间珠江较大的径流量, 1999 年冲淡水的扩展范围要大于 2009 年。1999 年夏季珠江口水体存在较强的盐度层结,
而2009年夏季受较小的珠江径流量和热带风暴“浪卡”的共同作用, 水体盐度层结较弱, 0—5m层水体垂向混合良好。
两年夏季珠江口表层溶解氧(DO)的分布较为相似, 而底层溶解氧的分布则有显著差异, 主要表现在河口西岸浅滩区和
河口口门外。1999年河口西岸浅滩区DO小于3mg·L−1, 河口口门外DO 在4—5mg·L−1之间, 2009年河口西岸浅滩DO大于 5mg·L−1
, 河口口门外 DO 小于 3mg·L-1。1999 年夏季伶仃洋海域内较强的盐度层结是其底层出现低氧环境的主要
原因, 2009 年夏季强化的垂向混合使得表底层溶解氧得到了及时交换, 阻碍了西岸浅滩区底层低氧环境的出现, 而盐
度层化和“浪卡”带来的浮游生物的耗氧作用可能是口门外底层出现低氧环境的原因。

关键词: 夏季, 珠江口, 冲淡水, 溶解氧, 盐度层结, 热带风暴

Abstract:

By analyzing the temperature, salinity, dissolved oxygen (DO), chlorophyll, and river discharge data observed in the
summers of 1999 and 2009 in the Pearl River Estuary (PRE), we find that the spreading range of the freshwater plume in 1999
was larger than that in 2009 due to larger runoff from the Pearl River. The salinity profiles showed a strong stratification inside
the PRE in 1999, but a weak stratification in 2009, owing to the co-effect of the smaller river discharge and stronger winds
associated with the tropical storm “Nangka”, which makes the water column well mixed in the top 5 m. The DO distribution
patterns for the two years were similar near the surface, but were quite different at the bottom, especially in the western shal-
low area and outside the mouth of the PRE. In 1999, the DO concentration was less than 3 mg·L−1
in the western shallow area and between 4−5 mg·L−1 outside the mouth of the PRE; but in 2009 it was greater than 5 mg·L−1
in the western shallow area and less than 3mg·L−1 outside the mouth. Strong stratification in the PRE was the main reason for the low concentration of
bottom DO in the western shallow area in 1999. The intensified vertical mixing induced by “Nangka” facilitated the exchange
of DO between the surface and bottom waters, which prevented the formation of low concentration DO in this region in 2009;
however, the salinity stratification and consumption of oxygen by the phytoplankton blooms triggered by “Nangka” might be
the reasons for the low DO content in the bottom water outside the mouth of PRE.

Key words: summer, Pearl River Estuary, river plume, dissolved oxygen, stratification, tropical storm

杨威 ,罗琳 ,高永利 ,俎婷婷 ,周巍 ,王东晓 . 1999年和 2009 年夏季珠江口环境要素的对比与分析[J]. 热带海洋学报, 2011, 30(4): 16-23.

YANG Wei,LUO Lin,GAO Yong-li,ZU Ting-ting,ZHOU Wei,WANG Dong-xiao. Comparison of environmental constituents in the Pearl River Estuary during summer of 1999 and 2009[J]. Journal of Tropical Oceanography, 2011, 30(4): 16-23.

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1999年和 2009 年夏季珠江口环境要素的对比与分析

Comparison of environmental constituents in the Pearl River Estuary during summer of 1999 and 2009

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