Millennial variations in Arabian Sea sediment proxies: the connection to North Atlantic climate

根据该合同，pi将使用各种古生产力代用物来检验一种假设，即阿拉伯海OMZ强度的千年变化与与西南印度洋季风相关的上升流有利风的强度变化直接相关。为了在阿拉伯海的静态/间定时间尺度上重建出口产量，pi将以高分辨率测量230衍生的总有机碳和总c37 -烯酮积累速率、自生铀浓度和xs231Pa/xs230比值。烯酮不饱和比（Uk. 37）将用于在静/静间时间尺度上重建过去的海面温度（SSTs）。这项工作的结果将提高对以下方面的认识：1)阿拉伯海气候变率与北大西洋高纬度地区已建立的记录之间的远相关；2)沉积物中出口产量的代用物；3)海温与印度洋季风系统动力学之间的关系。

Under this award the PIs will use a variety of paleoproductivity proxies to test the hypothesis that millennial changes in OMZ intensity in the Arabian Sea are directly related to changes in the intensity of upwelling-favorable winds associated with the SW Indian Ocean monsoon. To reconstruct export production on stadial/interstadial timescales in the Arabian Sea the PIs will measure at high-resolution the 230Th-derived accumulation rates of total organic carbon and total C37-alkenones, the authigenic uranium concentration, and the xs231Pa/xs230Th ratio. The alkenone unsaturation ratio (Uk. 37) will be used to reconstruct past sea-surface temperatures (SSTs) on stadial/interstadial timescales. Results of this work will improve understanding of 1) the teleconnections linking climate variability in the Arabian Sea to well-established records in the high-latitude North Atlantic region, 2) proxies of export production in sediments, and 3) the relationship between SST and the dynamics of the Indian Ocean monsoon system.