Changes in pH at the exterior surface of plankton with ocean acidification
Changes in pH at the exterior surface of plankton with ocean acidification
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DOI：
10.1038/nclimate1489
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发表时间：
2012-07-01
影响因子：
30.7
通讯作者：
Wheeler, Glen L.
中科院分区：
文献类型：
--
作者：
Flynn, Kevin J.;Blackford, Jerry C.;Wheeler, Glen L.
人类活动释放的二氧化碳正溶解在海洋中，导致散装海水的pH值下降(海洋酸化)。预测表明，到2100年，pH值将比现值下降0.3个单位(参考文献)。1)。然而，目前还不清楚浮游生物的生长可能会做出什么反应。我们利用模拟演示了海洋生物外表面的pH和碳酸盐化学如何随着生物新陈代谢活动和大小的增加而越来越不同于大部分海水。随着海水的缓冲能力随着pH值的降低而降低，以及新陈代谢活动随着海水温度的升高而增加，未来这些偏差将会增加。我们表明，许多海洋浮游生物将经历完全超出其近期历史范围的PH值条件。然而，海洋酸化可能对浮游生物生理学产生不同的影响，因为在水华期间，生物大小、代谢活动和生长速度的不同分类群导致生物周围的微环境非常不同。这是未来海洋酸化研究的一个重要考虑因素，因为大多数浮游生物所经历的碳酸盐化学可能与在散装海水样品中测得的有很大不同。了解这些偏差将有助于解释海洋酸化对不同大小和代谢活动的浮游生物的影响。
Anthropogenically released CO2 is dissolving in the ocean, causing a decrease in bulk-seawater pH (ocean acidification). Projections indicate that the pH will drop 0.3 units from its present value by 2100 (ref. 1). However, it is unclear how the growth of plankton is likely to respond. Using simulations we demonstrate how pH and carbonate chemistry at the exterior surface of marine organisms deviates increasingly from those of the bulk sea water as organism metabolic activity and size increases. These deviations will increase in the future as the buffering capacity of sea water decreases with decreased pH and as metabolic activity increases with raised seawater temperatures. We show that many marine plankton will experience pH conditions completely outside their recent historical range. However, ocean acidification is likely to have differing impacts on plankton physiology as taxon-specific differences in organism size, metabolic activity and growth rates during blooms result in very different microenvironments around the organism. This is an important consideration for future studies in ocean acidification as the carbonate chemistry experienced by most planktonic organisms will probably be considerably different from that measured in bulk-seawater samples. An understanding of these deviations will assist interpretation of the impacts of ocean acidification on plankton of different size and metabolic activity.