Maintenance of Preindustrial Atmospheric pCO2 Levels: Recalibration of a Carbon Isotopic Paleobarometer and pCO2 mapping of the late Quaternary Global Ocean.

长链烯酮的碳同位素组成将是 与共存的有孔虫碳酸盐相比， 代表性的海洋沃茨， 溶解的二氧化碳的浓度也是已知的。 的 目的是研究碳同位素 分馏和二氧化碳水平，从而校准“二氧化碳 古气压计“在寒冷的高纬度沃茨， 将在收集的材料中检查下沉材料， JGOFS北大西洋水华实验 大量数据显示， 溶解二氧化碳的浓度和同位素组成已经 可用于该网站。 来自南方的烯酮和碳酸盐 也有海洋断面和碳酸盐数据 化学和同位素组成。 在低纬度地区， 表层沃茨，东赤道太平洋JGOFS资料 现场将进行检查。 烯酮将从暂停 颗粒有机碳 浓度和同位素 溶解CO2的组成可从JGOFS报告中获得， 有孔虫的同位素组成将在课程中确定 这个工作。 到达沉积物的同位素信号 水界面将通过分析来自 核心顶部在挪威海（高纬度，低温 地点）和东赤道太平洋JGOFS地点。

The carbon-isotopic compositions of long-chain alkenones will be compared to those of coexisting foraminiferal carbonates in representative in representative ocean waters for which the concentration of dissolved carbon dioxide is also known. The objective will be to examine relationships between carbon-isotopic fractionations and CO2 levels, thus calibrating a "CO2 paleobarometer." In cold, high latitude waters, both suspended and sinking materials will be examined in materials collected during the JGOFS North Atlantic Bloom Experiment. Extensive data on the concentration and isotopic composition of dissolved CO2 are already available for that site. Alkenones and carbonates from Southern Ocean transects are also available, as are data on carbonate chemistry and isotopic composition. At lower latitudes with warmer surface waters, materials from the Eastern Equatorial Pacific JGOFS site will be examined. Alkenones will be obtained from suspended particulate organic carbon. Concentrations and isotopic compositions of dissolved CO2 are available from JGOFS reports and the isotopic composition of forams will be determined in the course of this work. Isotopic signals actually reaching the sediment water interface will be examined through analyses of materials from core tops in the Norwegian Sea (high-latitude, low-temperature site) and at the Eastern Equatorial Pacific JGOFS site.