Early Diagenesis of Pigments in Anoxic Marine Sediments

高产的秘鲁上升流系统经常受到扰动 周期性的厄尔尼诺-南方涛动事件， 高于平均水平的海面温度和急剧下降 降低该地区的生产力。 一个历史 秘鲁边缘沉积物中的厄尔尼诺记录来自于 烯酮分布和UK 37作为古海洋代用指标 表面温度 这项研究将加强和扩大 对秘鲁沉积物进行了更详细的研究， 延伸超过500 ybp。 研究的初步重点将是 沉积物中的退涡成岩作用和输入驱动变化 二氢卟酚和类胡萝卜素的记录。 通过测量 两种色素（类胡萝卜素，二氢卟酚）及其降解 产品（loliolides，吡咯），沉积过程中的瞬时变化 条件将能够被识别。 此信息将 结合沉积物中总色素的数据， 摩尔总和：（色素+降解产物），以测量变化 原始输入。 保存在海洋中的水文变化 烯酮记录与预期的性质和强度的变化 藻类色素记录中保存的初级生产量， 然后比较沉积物。

The highly productive Peru upwelling system is regularly perturbed by periodic El Nino-Southern Oscillation events that result in warmer-than-average sea surface temperatures and a sharp reduction in the reduction in the region's productivity. An historical record of El Nino in Peru Margin sediments has been derived from the distribution of alkenones and Uk37 as proxy for paleo-sea surface temperature. This research will enhance and expand on these results with a more detailed study of Peru sediments extending over 500 ybp. The initial focus of the study will be to deconvolute diagenetic and input driven changes in the sedimentary record of chlorins and carotenoids. By measuring the distribution of both pigments (carotenoids, chlorins) and their degradation products (loliolides, pyrroles), transient changes in depositional conditions will be able to be identified. This information will be combined with data from the total pigment in sediment expressed as the molar sum: (pigment + degradation product), to measure changes in original input. Changes in hydrography preserved in the alkenone record with expected changes in the nature and intensity of primary production preserved in the record of algal pigments in sediments will then be compared.