CO2 sensitivity of Southern Ocean phytoplankton
CO2 sensitivity of Southern Ocean phytoplankton
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DOI：
10.1029/2007gl032583
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发表时间：
2008-02-20
影响因子：
5.2
通讯作者：
DiTullio, Giacomo R.
中科院分区：
文献类型：
--
作者：
Tortell, Philippe D.;Payne, Christopher D.;DiTullio, Giacomo R.
南大洋对海洋生态地球化学循环和全球海气CO（2）通量具有重要影响。在即将到来的世纪，表层海洋CO（2）水平的大幅增加，加上上层水柱温度和分层的增加，预计将减少南大洋的CO（2）吸收。这些影响可能会受到该地区生物碳泵中伴随的CO（2）依赖性变化的显着调制。本文研究了南极罗斯海CO2浓度对浮游植物群落的生理、生长和物种组成的影响。现场取样和船上培养实验的结果表明，无机碳的吸收，稳态生产力和硅藻物种组成是敏感的CO（2）浓度范围从100至800 ppm。二氧化碳浓度升高导致浮游植物生产力显著增加，促进了更大的链形成硅藻的生长。我们的研究结果表明，CO（2）浓度可以影响南大洋的生物碳循环，从而产生潜在的气候反馈。
The Southern Ocean exerts a strong impact on marine biogeochemical cycles and global air-sea CO(2) fluxes. Over the coming century, large increases in surface ocean CO(2) levels, combined with increased upper water column temperatures and stratification, are expected to diminish Southern Ocean CO(2) uptake. These effects could be significantly modulated by concomitant CO(2)-dependent changes in the region's biological carbon pump. Here we show that CO(2) concentrations affect the physiology, growth and species composition of phytoplankton assemblages in the Ross Sea, Antarctica. Field results from in situ sampling and ship-board incubation experiments demonstrate that inorganic carbon uptake, steady-state productivity and diatom species composition are sensitive to CO(2) concentrations ranging from 100 to 800 ppm. Elevated CO(2) led to a measurable increase in phytoplankton productivity, promoting the growth of larger chain-forming diatoms. Our results suggest that CO(2) concentrations can influence biological carbon cycling in the Southern Ocean, thereby creating potential climate feedbacks.