Quantification of the Biogenic Silica Dissolution in Southern Ocean Sediments
Quantification of the Biogenic Silica Dissolution in Southern Ocean Sediments
复制标题
南大洋沉积物中生物二氧化硅溶解的定量
DOI：
10.1016/0033-5894(92)90073-r
复制
发表时间：
1992
影响因子：
2.3
通讯作者：
J. Turon
中科院分区：
文献类型：
--
作者：
J. Pichon;G. Bareille;M. Labracherie;L. Labeyrie;A. Baudrimont;J. Turon
建立了一个传递函数来量化硅藻二氧化硅在南大洋沉积物中的溶解。硅溶解量和硅藻物种分布的变化之间的关系是建立控制渐进溶解的生物硅在最近的五个沉积物样品从盒芯顶部，每个现代硅藻物种沉积物组合的代表。对于每个实验测量溶解的二氧化硅的量。由此产生的物种丰度的数据集（42个样本，含32种硅藻和2 silicoflagellate属）被添加到现代数据库的硅藻物种分布在南大洋（124个核心顶部）。Q型因子分析将四个因子独立化，解释了83%的方差。前三个因素受地表水性质（主要是温度）控制。第四个因子是唯一与参比样品中二氧化硅损失相关的因子（R = 0.900）。我们使用这种相关性对溶解因子进行了量化：从低纬度到高纬度，东南印度洋表层沉积物的特征是，从亚南极带（40°S）到55°S左右，溶解导致的二氧化硅损失减少（从> 50%到10%），然后在63°和68°S之间，二氧化硅损失增加到大于60%的值。在南大洋（南纬44°和55°）的两个岩心中应用溶解因子表明，在末次冰期，特别是在Emiliani第3阶段（从40，000年到30，000年B.P.），蛋白石溶解增强。
A transfer function has been established to quantify the dissolution of diatom silica in Southern Ocean sediments. The relationship between the amount of silica dissolution and changes in diatom species distribution is built by controlled progressive dissolution of biogenic silica in five recent sediment samples from box-core tops, each representative of a modern diatom species sediment assemblage. The amount of dissolved silica was measured for each experiment. The resulting data set of species abundances (42 samples containing 32 diatom species and 2 silicoflagellate genera) was added to the modern data base of diatom species distributed over the Southern Ocean (124 core tops). Q-mode factor analysis individualizes four factors explaining 83% of the variance. The first three factors are controlled by surface water properties (mostly temperature). The fourth factor is the only one correlated with loss of silica in the reference samples (R = 0.900). We quantified the dissolution factor using this correlation: superficial sediments of the Southeast Indian Ocean are characterized, from low to high latitudes, by a decrease in silica loss by dissolution (from >50 to 10%) from the Subantarctic Zone (40°S) to around 55°S, followed by an increase of silica loss to values larger than 60% between 63° and 68°S. Application of the dissolution factor in two cores from the Southern Ocean (≈44° and 55°S) shows enhanced opal dissolution during the last glaciation, particularly during Emiliani's stage 3 (from 40,000 to 30,000 yr B.P.).