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

Abstract

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

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

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