19. PLEISTOCENE VARIATIONS IN DEEP ATLANTIC CIRCULATION AND CALCITE BURIAL BETWEEN 1.2 AND 0.6 MA: A COMBINED DATA-MODEL APPROACH 1
19. PLEISTOCENE VARIATIONS IN DEEP ATLANTIC CIRCULATION AND CALCITE BURIAL BETWEEN 1.2 AND 0.6 MA: A COMBINED DATA-MODEL APPROACH 1
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19. 1.2 至 0.6 MA 之间大西洋深部环流和方解石埋藏的更新世变化：组合数据模型方法 1
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发表时间：
1997
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影响因子：
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通讯作者：
P. Leth
中科院分区：
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作者：
P. deMenocal;D. Archer;P. Leth
Ceara隆起点925、928和929在1.2-0.6 Ma期间的碳酸盐百分比和埋藏Sux数据表明，碳酸盐埋藏、全球冰量(海底δ18O)和大西洋深部环流(海底δ13C)发生了一致的、同相变化。一个与时间相关的方解石溶解模型被用来探索这一过程和其他过程的沉积特征。如果100-K.Y很强，数据和模型结果是最好的协调。和41-K.Y。大西洋碳酸盐旋回被解释为与北大西洋冰川深水产量减少和相关的腐蚀性南极底层水向北侵入有关的快速溶解响应特征。这些大西洋沉积物表现出碳酸盐埋藏和深部环流之间的同相协变，而太平洋和印度洋碳酸盐记录明显滞后于冰川冰量。冰期期间大西洋盆地以外的碳酸盐埋藏被解释为与平均海洋碱度水平暂时上升(由于大西洋碳酸盐溶解)和相关的5-10-K.Y有关。碳酸盐离子响应时间。根据这些结果，大西洋深层环流的变化似乎是导致观测到的太平洋和印度洋冰期-间冰期碳酸盐沉积模式的主要过程。
Carbonate percentage and burial sux data for the 1.2 - 0.6 Ma interval at Ceara Rise Sites 925, 928, and 929 indicate coherent, in-phase variations in carbonate burial, global ice volume (benthic δ 18 O) and Atlantic deep circulation (benthic δ 13 C). A time-dependent calcite dissolution model is used to explore the sedimentary signatures of this and other processes. The data and model results are best reconciled if the strong 100-k.y. and 41-k.y. Atlantic carbonate cycles are interpreted in terms of rapid dissolution response signatures related to reduced glacial North Atlantic Deep Water production and associated northward incursion of corrosive Antarctic Bottom Water. Whereas these Atlantic sediments exhibit in-phase covariation between carbonate burial and deep circulation, PaciÞc and Indian Ocean carbonate records signiÞcantly lag glacial ice volume. Carbonate burial outside the Atlantic basin during glacial intervals is interpreted to be related to enhanced preservation resulting from the temporary increase in mean ocean alkalinity levels (due to Atlantic carbonate dissolution) and the associated 5- to 10-k.y. carbonate ion response time. Based on these results, deep Atlantic circulation changes appear to be the dominant process responsible for the observed PaciÞc and Indian Ocean glacial-interglacial carbonate deposition patterns.