Early Diagenesis of Pigments in Anoxic Marine Sediments

秘鲁高生产力的上升流系统经常受到周期性厄尔尼诺-南方涛动事件的干扰，这些事件导致海洋表面温度高于平均水平，并使该区域的生产力急剧下降。秘鲁边缘沉积物中厄尔尼诺现象的历史记录来自于烷烃类化合物的分布和代表古海表温度的Uk37。这项研究将加强和扩展这些结果，对延伸超过500年的秘鲁沉积物进行更详细的研究。这项研究的最初重点将是解旋、成岩和输入驱动的氯素和类胡萝卜素沉积记录的变化。通过测量色素(类胡萝卜素、氯素)及其降解产物(类胡萝卜素、吡咯)的分布，将能够识别沉积条件的瞬时变化。这些信息将与沉积物中总颜料的数据结合在一起，以摩尔和表示：(颜料+降解产物)，以衡量原始输入的变化。然后将保存在烯酮记录中的水文变化与保存在沉积物中藻类色素记录中的初级生产的性质和强度的预期变化进行比较。

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.