THE ROLE OF CaCO3 COMPENSATION THE GLACIAL TO INTERGLACIAL ATMOSPHERIC CO2 CHANGE
THE ROLE OF CaCO3 COMPENSATION THE GLACIAL TO INTERGLACIAL ATMOSPHERIC CO2 CHANGE
复制标题
DOI：
10.1029/gb001i001p00015
复制
发表时间：
1987-03-01
影响因子：
5.2
通讯作者：
Peng, Tsung-Hung
中科院分区：
文献类型：
--
作者：
Broecker, Wallace;Peng, Tsung-Hung
迄今为止，根据从冰芯中提取的气体的二氧化碳含量测量结果所提出的关于大气二氧化碳含量从冰期到间冰期变化的唯一可行解释涉及海洋营养循环的变化。任何能够导致冰芯结果所显示的大气二氧化碳压力产生80微标准大气压变化的营养变化，也会在深海的碳酸根含量上产生显著变化。来自深海沉积物的证据表明，这些碳酸根的变化在几千年的时间尺度上会通过深海沉积物中碳酸钙积累量的减少或增加得到补偿。这个补偿过程有两个重要结果。首先，它显著增加了每单位营养强迫下二氧化碳变化的幅度。其次，它导致大气二氧化碳变化的响应延迟。虽然这些结果中的第一个对那些试图解释二氧化碳变化的人来说是有利的，但第二个可能被证明是不利的。冰芯二氧化碳记录没有显示出二氧化碳响应与极地变暖之间存在显著滞后的证据。无论如何，重要的是我们要提高对标志着冰川作用阶段结束的碳酸钙保存事件以及标志着这些阶段开始的溶解事件的幅度和时间的认识。
The only viable explanations put forth to date for the glacial to interglacial change in atmospheric CO2 content suggested from measurements of the CO2 content of gas extracted from ice cores involve changes in the ocean's nutrient cycles. Any nutrient change capable of creating the 80 mu atm changes in atmosphere CO 2 pressure suggested by the ice core results also creates significant change in the deep ocean's C0(3)- content. Evidence from deep sea sediments suggests that these C0(3)-- changes are compensated on the time scale of a few thousand years by reductions or increases in amount of CaCo3 accumulating in deep sea sediments. This compensation process has two important consequences. First, it significantly increases the magnitude of the CO2 change per unit of nutrient forcing. Second, it causes a delay in the response of the atmospheric CO2 change. While the first of these consequences is a boon to those seeking to explain the CO2 change, the second may prove to be a curse. The ice core C0(2) record shows no evidence of a significant lag between the CO2 response and the polar warming. In any case it is important that we improve our knowledge of the magnitude and timing of the CaC0(3) preservation events which mark the close of episodes of glaciation and of the dissolution events which mark the onset of these episodes.