Decreased marine dimethyl sulfide production under elevated CO2 levels in mesocosm and in vitro studies
Decreased marine dimethyl sulfide production under elevated CO2 levels in mesocosm and in vitro studies
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DOI：
10.1071/en11125
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发表时间：
2012-01-01
影响因子：
4.3
通讯作者：
Liss, Peter S.
中科院分区：
文献类型：
--
作者：
Avgoustidi, Valia;Nightingale, Philip D.;Liss, Peter S.
海洋吸收了人类活动产生的二氧化碳的大约一半，因此，表层海水将不可避免地变得越来越酸化。低pH值对海洋生物和海洋-大气交换的影响在很大程度上是未知的，但具有CaCO 3结构成分的生物可能特别受到影响。由于钙化浮游植物是二甲基硫（DMS）的重要生产者，因此了解海水pH值降低如何影响DMS的生产和排放到大气中至关重要。在这里，我们表明，由mesocosm（Raunefjorden，挪威，2003年4月至5月）和体外研究，DMS及其细胞前体二甲基磺基丙酸酯（DMSP）的净生产大约减半，在微生物群落进行加倍的CO2水平。我们的研究结果提供了证据，表明未来进入大气层的DMS数量可能会减少。由于二甲硫醚在大气中的氧化可通过增加云的蒸发量导致气候变冷，因此，来自pH值较低的海洋的二甲硫醚排放量减少的后果将是加剧全球变暖。
The oceans have absorbed approximately half of the CO2 produced by human activities and it is inevitable that surface seawaters will become increasingly acidified. The effect of lower pH on marine organisms and ocean-atmosphere exchanges is largely unknown but organisms with CaCO3 structural components are likely to be particularly affected. Because calcifying phytoplankton are significant producers of dimethyl sulfide (DMS), it is vital to understand how lower seawater pH may affect DMS production and emission to the atmosphere. Here we show, by mesocosm (Raunefjorden, Norway, April-May 2003) and in vitro studies, that the net production of DMS and its cellular precursor dimethylsulfoniopropionate (DMSP) is approximately halved in microbial communities subjected to doubled CO2 levels. Our findings provide evidence that the amount of DMS entering the atmosphere could decrease in the future. Because atmospheric oxidation of DMS can lead to climate cooling by increasing cloud albedo, a consequence of reduced DMS emissions from a lower pH ocean would be an enhancement in global warming.