Unanticipated consequences of ocean acidification: A noisier ocean at lower pH
Unanticipated consequences of ocean acidification: A noisier ocean at lower pH
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DOI：
10.1029/2008gl034913
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发表时间：
2008-10-01
影响因子：
5.2
通讯作者：
Brewer, Peter G.
中科院分区：
文献类型：
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作者：
Hester, Keith C.;Peltzer, Edward T.;Brewer, Peter G.
我们发现，化石燃料CO2入侵造成的海洋酸化和通风减少将导致频率低于约10 kHz的海洋声吸收显著减少。这种效应是由于已知的ph依赖性的B(OH)(3)/B(OH)(4)（-）和HCO3-/CO32-体系中的化学松弛。大气CO2 +105 ppmv变化引起的海洋表面pH值变化尺度约为-0.12 pH单位，导致声吸收（α = dB/km）的频率依赖性下降超过12%。根据对未来化石燃料二氧化碳排放和其他来源的合理预测，预计到本世纪中叶，pH值的变化将达到或超过0.3个单位，从而导致a减少近40%。由于吸收减少和人类活动来源增加的综合影响，海洋中对环境、军事和经济利益至关重要的听觉范围内的环境噪声水平将显著增加。
We show that ocean acidification from fossil fuel CO2 invasion and reduced ventilation will result in significant decreases in ocean sound absorption for frequencies lower than about 10 kHz. This effect is due to known pH-dependent chemical relaxations in the B(OH)(3)/B(OH)(4)(-) and HCO3-/CO32- systems. The scale of surface ocean pH change today from the +105 ppmv change in atmospheric CO2 is about -0.12 pH units, resulting in frequency dependant decreases in sound absorption (alpha = dB/km) exceeding 12%. Under reasonable projections of future fossil fuel CO2 emissions and other sources a pH change of 0.3 units or more can be anticipated by mid-century, resulting in a decrease in a by almost 40%. Ambient noise levels in the ocean within the auditory range critical for environmental, military, and economic interests are set to increase significantly due to the combined effects of decreased absorption and increasing sources from mankind's activities.