Nutrient leakage from the North Pacific to the Bering Sea (IODP Site U1341) following the onset of Northern Hemispheric Glaciation
Nutrient leakage from the North Pacific to the Bering Sea (IODP Site U1341) following the onset of Northern Hemispheric Glaciation
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北半球冰川作用发生后，营养盐从北太平洋泄漏到白令海（IODP 站点 U1341）
DOI：
10.1002/palo.20011
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
H.-J. Brumsack
中科院分区：
文献类型：
--
作者：
C. März;B. Schnetger;H.-J. Brumsack
综合大洋钻探计划第323次探险在白令海(综合大洋钻探计划地点U1341，鲍尔斯海脊，水深2177 m)发现了最后一段约4.3 Ma的沉积物记录。为了了解该边缘盆地上新世-更新世的古环境变化，对190个沉积物样品进行了整体元素组成分析。鲍尔斯海岭沉积物中的铝含量变化较大，但总体上较年轻的沉积物铝含量较高，可能与北半球冰川作用的加剧和白令海海冰输运的增加有关。陆源输入的逐渐增加反映在SiO2和过剩的Si(Sixs)含量的减少上，但矿床的总体Si的富集性反映了自上新世以来Bowers Ridge的持续的蛋白石沉积。与北太平洋不同，U1341站的Six记录并不支持在约2.7 Ma左右北半球冰川开始后蛋白石出口的急剧下降，但SiO_2 x在~2.6至~1.8 Ma BP之间具有较高的积累速率(高达~8 g/cm~2/ka)。在此期间，全球主要的海洋蛋白石沉积中心从开阔的海洋高纬度地区转移到上升区。我们在这里讨论北太平洋约2.7 Ma BP层化的开始可能导致营养丰富的北太平洋深层/中层水通过深层堪察加海峡泄漏到白令海，导致鲍尔斯海脊蛋白石沉积增加，并可能导致活性有机物输出。其结果是，磁性和地球化学记录被强烈的成岩作用叠加，显著影响了它们作为古海洋学指标的应用。
Intergrated Ocean Drilling Program Expedition 323 recovered a sediment record covering the last ~4.3 Ma from the Bering Sea (Integrated Ocean Drilling Program Site U1341, Bowers Ridge, 2177 m water depth). To resolve Pliocene‐Pleistocene paleoenvironmental changes in this marginal basin, ~190 sediment samples were analyzed for their bulk element composition. Aluminium contents in Bowers Ridge sediments are variable but overall higher toward younger sediments, probably related to the intensification of the Northern Hemispheric Glaciation and increasing sea ice transport in the Bering Sea. The gradual increase of terrigenous input is mirrored by decreasing SiO2and excess Si (Sixs) contents, but the overall Si enrichment of the deposits reflects continuous opal deposition since the Pliocene at Bowers Ridge. Unlike in the North Pacific, the Sixsrecord at Site U1341 does not support a dramatic decrease in opal export following the onset of the Northern Hemispheric Glaciation around 2.7 Ma, but SiO2xshave higher accumulation rates (up to ~8 g/cm2/ka) between ~2.6 and ~1.8 Ma BP. During this period, the major oceanic opal deposition centers shifted globally from open marine high latitude regions to upwelling areas. We here discuss how the onset of North Pacific stratification at ~2.7 Ma BP may have caused leakage of nutrient‐rich deep/intermediate North Pacific water into the Bering Sea via the deep Kamtchatka Strait, leading to increased opal deposition—and likely reactive organic matter export—at Bowers Ridge. As a result, magnetic and geochemical records were overprinted by intensified diagenesis, significantly affecting their applications as paleoceanographic proxies.
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影响因子：
5
作者：
N. Riedinger;Kerstin Pfeifer;S. Kasten;J. Garming;C. Vogt;C. Hensen
通讯作者：
N. Riedinger;Kerstin Pfeifer;S. Kasten;J. Garming;C. Vogt;C. Hensen
中新世晚期-上新世早期南极深水重复铁还原事件记录
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
D. Hepp;T. Mörz;C. Hensen;T. Frederichs;S. Kasten;N. Riedinger;W. W. Hay
通讯作者：
W. W. Hay
DOI：
10.1016/j.dsr.2004.05.003
发表时间：
2004-10-01
影响因子：
2.4
作者：
De Boer, AM;Nof, D
通讯作者：
Nof, D
硅质沉积物中的磁铁矿溶解
DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
F. Florindo;A. Roberts;M. Palmer
通讯作者：
M. Palmer
DOI：
10.1016/j.dsr2.2008.03.003
发表时间：
2008-08
影响因子：
3
作者：
R. Sambrotto;C. Mordy;S. Zeeman;Phyllis Stabeno;S. A. Macklin
通讯作者：
R. Sambrotto;C. Mordy;S. Zeeman;Phyllis Stabeno;S. A. Macklin