Long-term variations in oxygen in sub-tropical coastal waters: Influence of sewage effluent
Long-term variations in oxygen in sub-tropical coastal waters: Influence of sewage effluent
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DOI：
10.1080/14634988.2016.1240554
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发表时间：
2016-09
影响因子：
0.8
通讯作者：
Xiangcheng Yuan;Hui Huang;Weihua Zhou;Tao Yuan;Xiubao Li;Yongli Gao;Sheng Liu
中科院分区：
文献类型：
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作者：
Xiangcheng Yuan;Hui Huang;Weihua Zhou;Tao Yuan;Xiubao Li;Yongli Gao;Sheng Liu
珠江三角洲地区的人口增加，增加了生活污水和工业排放，影响了地球化学（如二氧化碳排放）和环境（如氧气消耗）状况。在2005-2006年的7个航次中，在8个站位不同月份采集了溶解氧和溶解无机碳浓度沿着、盐度、温度、pH值和叶绿素a，以记录人为输入对香港沃茨不同区域溶解氧的季节性影响。1997-2006年期间的长期数据被用来评估溶解氧的海气交换。在珠江口附近，溶解氧处于欠饱和状态，而二氧化碳分压处于过饱和状态，表明珠江口受影响的沃茨为异养水体，是大气二氧化碳的净来源。而受污水影响较大的维多利亚港全年溶解氧欠饱和程度甚至超过珠江口受影响的沃茨。与此相反，东部沃茨，那里有较少的人为输入的影响，表现出季节性变化：溶解氧的不饱和度（1090%）在旱季转移到轻微的过饱和度（10105%）在雨季。在维多利亚港，与旱季相比，雨季的月平均海气交换量减少了100 ~ 200 mmol m−2 d−1，这与叶绿素a含量从旱季到雨季的增加有关。这些研究结果对了解为何本港沃茨富营养化的影响并不像预期般严重，以及污水如何影响沿岸沃茨的溶解氧和碳的生态地球化学过程，十分重要。
The increase in population in the Pearl River delta region has increased domestic sewage and industrial discharges, which influences biogeochemical (e.g. carbon dioxide release) and environmental (e.g. oxygen depletion) conditions. Dissolved oxygen and dissolved inorganic carbon concentrations along with salinity, temperature, pH, and chlorophyll a at the surface were collected during seven cruises at eight stations in different months in 2005–2006 to document the seasonal influence of anthropogenic inputs on dissolved oxygen in different areas of Hong Kong waters. Long-term data during 1997–2006 were used to assess air-sea exchange of dissolved oxygen. Near the Pearl River estuary, dissolved oxygen was undersaturated, while partial pressure carbon dioxide was oversaturated, which indicated that Pearl River estuary influenced waters were heterotrophic and represented net sources of carbon dioxide to the atmosphere. In Victoria Harbour, where there was greater sewage effluent influence, however, the degree of dissolved oxygen undersaturation was even more than the Pearl River estuary influenced waters throughout the year. In contrast, the eastern waters, where there was less influence of anthropogenic inputs, showed seasonal variability: undersaturation of dissolved oxygen (∼90%) in the dry season shifting to slight oversaturation (∼105%) in the wet season. The monthly average air-sea influx of oxygen decreased by ∼50 to 200 mmol m−2 d−1 in the wet season relative to that in the dry season in Victoria Harbour, which was coupled with an increase in chlorophyll a from the dry to wet season. These findings are important in understanding why the eutrophication impact from nutrient enrichments in Hong Kong waters is not as severe as one would expect, and also how sewage effluent influences biogeochemical processes of dissolved oxygen and carbon in coastal waters.