Silicon-isotope composition of diatoms as an indicator of past oceanic change

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	Silicon-isotope composition of diatoms as an indicator of past oceanic change
	C. L. De La Rocha ; M. A. Brzezinski ; M. J. DeNiro ; A. Shemesh
发表期刊	Nature
	1998
卷号	395 页码:680-683
通讯作者	C. L. De La Rocha
英文摘要	Silicon is essential for the growth of diatoms, a group of phytoplankton with opal (amorphous hydrated silica) shells. Diatoms largely control the cycling of silicon in the ocean1 and, conversely, diatom silica production rates can be limited by the availability of silicic acid2. Diatoms are biogeochemically important in that they account for an estimated 75% of the primary production occurring in coastal and nutrient-replete waters1, rising to more than 90% during ice-edge blooms such as occur in the Ross Sea, off Antarctica3. There are few means by which to reconstruct the history of diatom productivity and marine silicon cycling, and thus to explore the potential contribution of diatoms to past oceanic biogeochemistry or climate. Indices based on the accumulation of sedimentary opal are often biased by the winnowing and focusing of sediments and by opal dissolution4, 5, 6, 7. Normalization of opal accumulation records using particle-reactive natural radionuclides may correct for sediment redistribution artefacts and the dissolution of opal within sediments6,8, but not for opal dissolution before it arrives at the sea floor. Half of the opal produced in the euphotic zone may dissolve before sinking to a depth of 200 m (ref. 1), constituting a potentially large bias to both normalized and uncorrected records of opal accumulation. Here we exploit the potential that variations in the ratio of 30Si to 28Si in sedimentary opal may provide information on past silicon cycling that is unbiased by opal dissolution. Our silicon stable-isotope measurements suggest that the percentage utilization of silicic acid by diatoms in the Southern Ocean during the last glacial period was strongly diminished relative to the present interglacial.
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/4639
专题	科研共享资源
推荐引用方式 GB/T 7714	C. L. De La Rocha,M. A. Brzezinski,M. J. DeNiro,et al. Silicon-isotope composition of diatoms as an indicator of past oceanic change[J]. Nature,1998,395:680-683.
APA	C. L. De La Rocha,M. A. Brzezinski,M. J. DeNiro,&A. Shemesh.(1998).Silicon-isotope composition of diatoms as an indicator of past oceanic change.Nature,395,680-683.
MLA	C. L. De La Rocha,et al."Silicon-isotope composition of diatoms as an indicator of past oceanic change".Nature 395(1998):680-683.

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