Differential dissolution: Modification of Late Pleistocene oxygen isotope records in the western equatorial Pacific
Differential dissolution: Modification of Late Pleistocene oxygen isotope records in the western equatorial Pacific
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差异溶解：赤道西太平洋晚更新世氧同位素记录的修正
DOI：
10.1029/pa005i004p00581
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
W. Berger
中科院分区：
文献类型：
--
作者：
Guoping Wu;J. Herguera;W. Berger
太平洋的深海记录显示，在更新世晚期，碳酸钙的溶解强度发生了巨大变化。极端的特点是在冰消期（保存尖峰）和冰增长期（溶解尖峰）的溶解强度大大降低。在溶解峰值处溶解强度的增加通过优先去除富含16 O的壳层而使δ 18 O记录失真，导致这些剖面的δ 18 O值变重。δ 18 O值在冰消期保存峰期趋于保持不变。因此，碳酸盐溶解强度的波动改变了晚更新世氧同位素记录，使得明显的“气候最佳值”（由最轻的δ 18 O值定义）倾向于向保存峰移动，而明显的“冰川最大值”（由最重的δ 18 O值定义）则向溶解峰移动。
Deep-sea records of the Pacific Ocean show dramatic variations in the dissolution intensity of calcium carbonate through the late Pleistocene. Extremes are characterized by much depressed dissolution intensity during deglaciation (preservation spikes) and much enhanced dissolution intensity during ice growth (dissolution spikes). Increased dissolution intensity at dissolution spikes distorts δ18O records by preferential removal of 16O-rich shells, resulting in heavier δ18O values at these sections. The δ18O values tend to remain unaltered at deglacial preservation spikes. Thus the fluctuations of carbonate dissolution intensity modify the late Pleistocene oxygen isotope records in such a fashion that apparent “climate optima” (as defined by the lightest δ18O values) tend to shift toward preservation spikes, while apparent “glacial maxima” (characterized by the heaviest δ18O values) shift toward dissolution spikes.