Spatial reorganization in the equatorial divergence in the Eastern Tropical Pacific during the last 150 kyr
Spatial reorganization in the equatorial divergence in the Eastern Tropical Pacific during the last 150 kyr
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过去150 kyr热带东太平洋赤道辐散的空间重组
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
M. Kienast
中科院分区：
文献类型：
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作者：
N. Dubois;M. Kienast
来自热带东太平洋多个地点的大量沉积物氮同位素（δ 15 N）和有机碳（Corg）含量的高分辨率钻孔记录在末次冰期期间显示出显著的一致性，而在全新世和末次间冰期期间，它们显着分歧。冰川期δ 15 N记录的密切协变指向无机硝酸盐池背景同位素信号的区域变化，这可能是由附近亚氧区反硝化速率的变化引起的。另一方面，我们把间冰期δ 15 N和Corg记录的分歧归因于赤道分歧的空间重组。我们解释了南赤道海流最强上升流区的向南位移，以解释在温暖的间隔期间赤道记录的生产力降低和硝酸盐消耗量增加。
High‐resolution downcore records of bulk sediment nitrogen isotopes (δ15N) and organic carbon (Corg) contents from multiple Eastern Tropical Pacific sites show remarkable uniformity during the last glacial stage, whereas during the Holocene and the last interglacial period, they diverge significantly. The close covariation of δ15N records during glacial stages points toward regional changes in the background isotopic signal of the inorganic nitrate pool, likely caused by variations in the denitrification rates in the nearby suboxic zones. On the other hand, we attribute the divergence of the δ15N and Corg records during interglacial periods to a spatial reorganization in the equatorial divergence. We posit a southward displacement of the zone of strongest upwelling in the South Equatorial Current to explain the reduced productivity and higher nitrate consumption recorded at the equator during warmer intervals.
影响因子：
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作者：
D. Rincón-Martínez;F. Lamy;S. Contreras;G. Leduc;E. Bard;Cornelia Saukel;T. Blanz;A. Mackensen;R. Tiedemann
通讯作者：
D. Rincón-Martínez;F. Lamy;S. Contreras;G. Leduc;E. Bard;Cornelia Saukel;T. Blanz;A. Mackensen;R. Tiedemann