收稿日期: 2010-04-08
修回日期: 2010-08-03
网络出版日期: 2011-09-08
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
Received date: 2010-04-08
Revised date: 2010-08-03
Online published: 2011-09-08
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。
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 . DOI: 10.11978/j.issn.1009-5470.2011.04.016
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
[1] CHEN J C, HEINKE G W, ZHOU M J. The Pearl River Estuary Pollution Project (PREPP)[J]. Cont shelf Res, 2004, 24: 1739-1744.
[2] ZU T T, GAN J P. Process-oriented study of the river plume and circulation in the Pearl River Estuary: Response to the wind and tidal forcing[J]. Advances in Geosciences, 2007, 12: 225-242.
[3] DONG L X, SU J L, WONG L A, et al. Seasonal variation and dynamics of the Pearl River Plume[J]. Cont Shelf Res, 2004, 24: 1761-1777.
[4] SU J L. Overview of the South China Sea circulation and its influence on the coastal physical oceanography outside the Pearl River Estuary[J]. Cont Shelf Res, 2004, 24: 1745-1760.
[5] WONG L A, CHEN J C, DONG L X. A model study of the plume front of the Pearl River Estuary, China and adjacent coastal waters in the winter dry season[J]. Cont Shelf Res, 2004, 24: 1779-1795.
[6] OU S Y, ZHANG H, WANG D X,et al. Horizontal characteristics of buoyant plume off the Pearl River Estuary during summer[J]. J Coast Res, 2007, 50: 652-657.
[7] OU S Y, ZHANG H, WANG D X. Dynamics of the buoyant plume off the Pearl River Estuary in summer[J]. Environ Fluid Mech, 2009, 9: 471-492.
[8] 庞海龙, 高会旺, 宋萍萍, 等. 夏季珠江冲淡水扩散路径分析[J]. 海洋预报, 2006, 23(3): 58-63.
[9] GAN J P, LI L, WANG D X, et al. Interaction of a river plume with coastal upwelling in the northeastern South China Sea[J]. Cont Shelf Res, 2009, 29: 728-740.
[10] CAI W J, DAI M H, WANG Y C. The biogeochemistry of inorganic carbon and nutrients in the Pearl River Estuary and the adjacent Northern South China Sea[J]. Cont Shelf Res, 2004, 24: 1301-1319.
[11] YIN K D, ZHANG J, QIAN P Y. Effect of wind events on phytoplankton blooms in the Pearl River Estuary during summer[J]. Cont Shelf Res, 2004, 24: 1909-1923.
[12] YIN K D, LIN Z F, KE Z Y. Temporal and spatial distribution of dissolved oxygen in the Pearl River Estuary and adjacent coastal waters[J]. Cont Shelf Res, 2004, 24: 1935-1948.
[13] 罗琳, 李适宇, 厉红梅. 夏季珠江口水域溶解氧的特征及影响因素[J]. 中山大学学报: 自然科学版, 2005, 44(6): 118-122.
[14] 罗琳, 李适宇, 王东晓. 珠江口夏季缺氧现象的模拟[J]. 水科学进展, 2008, 19(5): 729-736.
[15] LUO L, LI S Y, WANG D X. Hypoxia in the Pearl River Estuary, the South China Sea, in July 1999[J].Aquatic Ecosystem Health & Management, 2009,12(4): 418-428.
[16] 林卫强, 李适宇. 夏季伶仃洋COD、DO的垂向分布及其影响因素[J]. 中山大学学报: 自然科学版, 2002, 41(4): 82-86.
[17] 林洪瑛, 刘胜, 韩舞鹰. 珠江口底层海水季节性缺氧现象及其引发CTB的潜在威胁[J]. 湛江海洋大学学报, 2001, 21: 25-29.
[18] ZHAO H, TANG D L, WANG D X. Phytoplankton blooms near the Pearl River Estuary induced by Typhoon Nuri[J]. J Geophys Res, 2009, 114, C12027, doi:10.1029/ 2009JC005384.
[19] ZHAO H, TANG D L, WANG Y Q. Comparison of phytoplankton blooms triggered by two typhoons with different intensities and translation speeds in the South China Sea[J]. Mar Ecol Prog Ser, 2008, 365: 57-65.
[20] 姚章民, 王永勇, 李爱鸣. 珠江三角洲主要河道水量分配比变化初步分析[EB/OL]. [2008-10-31]. http://www. pearlwater.gov.cn/zjls/ t20071107_22029.htm.
/
〈 | 〉 |