Potential of ikaite to record the evolution of oceanic δ18O
Potential of ikaite to record the evolution of oceanic δ18O
复制标题
伊凯特记录海洋δ18O演化的潜力
作者：
R. Rickaby;S. Shaw;G. Bennitt;H. Kennedy;M. Zabel;A. Lennie
在寻求了解气候系统敏感性的过程中，一个挑战是分离冰量或海平面、盐度和温度对有孔虫{?? 180}的竞争影响。我们提出了在富有机碳的深海沉积物中发现的一种水合形式的碳酸钙矿物钙钛矿的沉淀实验，表明钙钛矿晶体中的水合水捕获了{?？18O}的海水(?？18 Osw)，分馏系数为1.0029（0.0002）。{? ?18w}测量大陆冰的体积，并叠加了当地的盐度。{?？通过对温度\<4 {?？C}可以用来记录更新世期间的海平面。{?？末次盛冰期冰碛石水化水体18Osw}与孔隙水模拟估计南极底水为+1.4?？？? 0.2 ? ?重。？? 2006年美国地质学会。
A challenge in the quest to understand the sensitivity of the climate system is the separation of the competing effects of ice volume or sea level, salinity, and temperature on foraminiferal {??18O.} We present precipitation experiments on the mineral ikaite, a hydrated form of calcium carbonate found in organic carbon-rich deep-marine sediments, that show that the hydration waters within the ikaite crystal capture the {??18O} of seawater (??18 Osw) with a fractionation factor of 1.0029 (??0.0002). The {??18Osw} measures the volume of continental ice, with an overprint of local salinity. Isolation of {??18Osw} by analysis of the hydration waters of sedimentary ikaite preserved at temperatures \<4 {??C} could be exploited to create a record of sea level during the Pleistocene. Preliminary data of {??18Osw} from hydration waters of ikaite at the Last Glacial Maximum agree with estimates from modeling of pore waters that Antarctic Bottom Water was +1.4??? ?? 0.2??? heavier. ?? 2006 Geological Society of America.
影响因子：
5
作者：
Hensen, C;Zabel, M;Boettius, A
通讯作者：
Boettius, A