Collaborative Research: Controls on Alkenone Temperature Estimates in Subtropical and Subpolar Waters

合作研究：副热带和副极地水域烯酮温度估计的控制

• 批准号: 0726592
• 负责人: Brian Popp
• 金额: $ 23.13万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-10-01 至 2011-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0726592&HistoricalAwards=false
• 关键词: Collaborative; Research; Controls; Alkenone; Temperature

The subtropical front (STF) is the northern boundary of the Southern Ocean, separating oligotrophic, warm subtropical surface waters north of the STF from cooler, nutrient-rich, subpolar waters to the south. East of New Zealand, the STF is bathymetrically anchored to the Chatham Rise, a 1000 km long submerged continental plateau. The National Institute of Water and Atmospheric Research (NIWA), New Zealand, maintains two sediment trap arrays only 200 km apart on the Chatham Rise. The traps, although closely spaced, sit just out of the axis of the STF and thus allow comparison of subtropical and subpolar waters under similar environmental conditions such as weather and light levels over the annual cycle without the complication of frontal migrations. In this project, researchers at Rutgers University and the University of Hawaii will examine at these sites the processes involved in the formation of the proxies on which paleo-sea surface temperatures (SST) records are based and resolve the issue of differential seasonality between the organisms which are arguably two of the most important paleotemperature estimators now in use (e.g. U37 K ' accuracy, foraminiferal '18O values). The principle hypotheses to be tested are:1. Episodic delivery of alkenones and foraminifera exported from the surface mixed layer are the underlying cause of differences between alkenone and foraminiferal temperature reconstructions.2. Nutrient depletion in subtropical waters during summer months and subsurface production during prolonged winter darkness in subpolar waters are important environmental influences controlling the accuracy of U 37 K ' SST reconstructions.Efforts in this work primarily and actively address the broader impact criteria of enhancing infrastructure for research. Collaborations among United States, New Zealand, and European scientists represent a significant investment in outreach with international colleagues by the US PI?s. The combined results will enhance the research of all members by disseminating shared data widely and serve to stimulate future partnerships. Additionally, training of students who will take central roles in this research addresses advancing training and learning. Better quantification of SST records will benefit paleoclimatic reconstructions and thus have societal benefits.

亚热带阵线（STF）是南大洋的北部边界，将STF以北的贫营养，温暖的亚热带地表水与凉爽的，营养丰富的，富含营养的水下水下水的亚光水。在新西兰以东，STF在降级1000公里长的Chatham Rise上固定在降级1000公里处。新西兰国家水与大气研究所（NIWA）在查塔姆崛起时保持了两个相距200公里的沉积物陷阱阵列。这些陷阱虽然距离紧密，但坐落在STF的轴上，因此可以比较在类似的环境条件下的亚热带和亚极水域，例如在年度周期内天气和光水平，而不会发生额叶迁移并发症。 In this project, researchers at Rutgers University and the University of Hawaii will examine at these sites the processes involved in the formation of the proxies on which paleo-sea surface temperatures (SST) records are based and resolve the issue of differential seasonality between the organisms which are arguably two of the most important paleotemperature estimators now in use (e.g. U37 K ' accuracy, foraminiferal '18O values). 要测试的原则假设为：1。从表面混合层导出的烯烃和有孔虫的情景递送是烯酮和有孔虫温度重建之间差异的根本原因。2。在夏季，亚热带水中的营养耗竭，在长时间的冬季黑暗中的地下产生在冬季水域中是重要的环境影响，从而控制了U 37 K'SST重建的准确性。这项工作中的成分主要且可积极地解决增强基础架构研究基础架构的更广泛影响标准。美国，新西兰和欧洲科学家之间的合作代表了美国PI与国际同事的大量投资。结合结果将通过广泛传播共享数据并刺激未来的伙伴关系来增强所有成员的研究。此外，培训将在这项研究中扮演核心角色的学生解决了进步培训和学习。更好地量化SST记录将使古气候的重建受益，从而具有社会利益。