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

根据该奖项，PI将使用各种古生产力代理来检验阿拉伯海OMZ强度的千年变化与西南印度洋季风相关的上升有利风强度变化直接相关的假设。 为了重建在阿拉伯海的stadial/interstadial时标上的出口生产，PI将以高分辨率测量230 Th衍生的总有机碳和总C37-烯酮的积累率、自生铀浓度和xs 231 Pa/xs 230 Th比率。 烯酮不饱和比（Uk. 37)将被用来重建过去的海表温度（SST）的stadial/interstadial时标。这项工作的结果将提高对以下问题的理解：1）将阿拉伯海气候变化与高纬度北大西洋地区的良好记录联系起来的遥相关，2）沉积物中输出生产的代理，以及3）SST与印度洋季风系统动态之间的关系。

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.