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于2011年6月下旬和8月下旬调查了渤海中央海区.6月份渤海所有测站底层溶解氧都超过7.0mg/L,饱和度为85%～115%,pH为7.82～8.04.而到了8月份,在渤海西北部、北部近岸水深20～35m的带状区域内出现底层溶氧显著下降并且酸化的现象.溶解氧最低值为渤海北部近岸的3.3～3.6mg/L,只有6月份的44%～47%;相应pH为7.64～7.68,比6月份低0.16～0.20.表观耗氧速率最高和pH降幅最大的测站都出现在渤海西北部近岸海域,累积溶解氧下降5.6mg/L,pH降幅则高达0.29,相当于总氢离子浓度升高1倍.简化的碳酸盐体系与耗氧量耦合分析表明,渤海西北部、北部近岸海域夏季底层低氧以及酸化环境的形成,与赤潮或者周边养殖业产生的生源颗粒在底层水体矿化分解,以及季节性层化现象阻滞海-气交换等因素密切相关.这样严酷并且剧变的水化学条件,是2011年夏季在渤海西北部、北部近岸海域发生海洋生态灾害事件的重要环境背景.
The Central Bohai Sea area was investigated in late June and late August 2011. The dissolved oxygen in the bottom of all stations in the Bohai Sea exceeded 7.0mg / L in June, with a saturation of 85% -115% and a pH of 7.82-8.04.At the same time, In the month, the dissolved oxygen in the northwestern Bohai Sea and the northern coastal waters with a depth of 20 ~ 35m were significantly decreased and acidified.The lowest dissolved oxygen was 3.3 ~ 3.6mg / L in the northern coast of Bohai Sea, and only in June The corresponding pH ranged from 7.64 to 7.68, which was 0.16-0.20 lower than that in June. The stations with the highest apparent oxygen consumption rate and the largest decrease in pH all appeared in the coastal waters off the northwest coast of the Bohai Sea, and the accumulated dissolved oxygen decreased by 5.6% mg / L, the pH drop was as high as 0.29, equivalent to twice the total hydrogen ion concentration.Coupled with the simplified carbonate system and oxygen consumption analysis showed that in the northwestern Bohai Sea, the northern coastal summer hypoxic and acidified environment Is closely related to the mineralization and decomposition of biogenic particles generated by the red tide or the peripheral aquaculture in the bottom water body and the seasonal stratification of the sea-air exchange, etc. This harsh and drastic change of water chemistry is the result of summer 2011 In the northwestern Bohai Sea, marine life occurs in the northern coastal waters Background of significant environmental disasters.