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.

副热带锋面（STF）是南大洋的北方边界，将STF北部贫营养、温暖的副热带表面沃茨与南部较冷、营养丰富的副极地沃茨分隔开来。在新西兰东部，STF的水深锚定在查塔姆海隆（Chatham Rise），这是一个长1000公里的水下大陆高原。新西兰国家水和大气研究所在查塔姆海隆保持着两个相距仅200公里的沉积物收集器阵列。陷阱，虽然间隔很近，坐在刚刚出轴的STF，从而允许比较亚热带和亚极地沃茨在类似的环境条件下，如天气和光照水平在年度周期没有并发症的正面迁移。在这个项目中，罗格斯大学和夏威夷大学的研究人员将在这些地点研究古海面温度记录所依据的代用指标的形成过程，并解决生物体之间的季节性差异问题，这可以说是目前使用的两个最重要的古温度估计值（例如，U37 K '精度，有孔虫' 18 O值）。 要检验的主要假设是：1。从表层混合层输出的烯酮和有孔虫的幕式输送是造成烯酮和有孔虫温度重建差异的根本原因.夏季亚热带沃茨中的营养物消耗和冬季亚极地沃茨中长时间黑暗期间的地下生产是控制U 37 K ' SST重建准确性的重要环境影响。美国、新西兰和欧洲科学家之间的合作代表了美国PI在与国际同行外联方面的重大投资。S.综合结果将通过广泛传播共享数据加强所有成员的研究，并有助于促进未来的伙伴关系。此外，对将在本研究中发挥核心作用的学生进行培训，以促进培训和学习。更好地量化SST记录将有利于古气候重建，从而具有社会效益。