Equipment Supplement for the Cariaco Ocean Time Series

卡里亚科海洋时间系列的设备补充

• 批准号: 0432616
• 负责人: Robert Thunell
• 金额: $ 3.56万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0432616&HistoricalAwards=false
• 关键词: Equipment; Supplement; Cariaco; Ocean; Time

ABSTRACTOCE 0432616The Cariaco oceanographic time series program collects systematic oceanographic measurements at 10'30N 64'40'W in order to understand the interrelationships between changes in climate, hydrography and sediment production and accumulation in Cariaco Basin. Cariaco is a 1,400-m deep depression on the Venezuelan continental margin that is openly connected to the surface Atlantic Ocean above a shallow (~140 m) sill. Because turnover of basin waters is slow (Deuser, 1973), decomposition of the sinking material leads to permanent anoxia below about 275 m. An excellent sediment record that is widely used to study Holocene and late Pleistocene changes in climate is preserved in this natural continental-shelf sediment trap. In this context, the Cariaco time series provides information on modern biogeochemical processes that will serve as a basis for accurately interpreting this sediment archive of climate change.The recently funded continuation of the Cariaco project for an additional five years (2003- 2008) will yield (1) a time series of the variability of the upwelling of Subtropical Underwater in the Cariaco Basin, including lateral motion, and its impact on primary productivity and the vertical flux of particulate matter; (2) the first direct calibration and concurrent cross-reference of various proxies of sea surface temperature of the Cariaco Basin; (3) clarification of the relative importance of lateral transport and chemoautotrophy as sources of particulates, (4) an assessment of whether variability in the particle flux is driven primarily by local winds or by regional oceanographic processes at the scale of the Tropical Atlantic, and (5) an evaluation of whether changes in nutrient availability/limitation result in major ecosystem changes.With funding through this small award, researchers from the University of South Carolina will purchase of an additional sediment trap and associated supplies. This sediment trap will be added to our existing array of four traps and will address the problem of not having a trap at a shallow enough depth (~150 m) to get an accurate estimate of export flux. Broader Impacts: The Cariaco time series program has significant educational impact on students in the US and on students and scientists in the Caribbean and Latin America. Three PhD students at U.S. universities have completed their degrees working on the Cariaco Project and four more are currently involved in this study. The Venezuelan Ministry for Science and Technology considers CARIACO the most significant oceanographic research program ever conducted in Venezuela, and uses it as a model program to provide direction for funding in other disciplines.

Cariaco海洋学时间序列计划收集了10'30 N 64' 40 'W的系统海洋学测量数据，以了解Cariaco盆地气候、水文和沉积物产生和积累变化之间的相互关系。Cariaco是委内瑞拉大陆边缘的一个1，400米深的凹陷，在浅（~140米）的岩床上方与大西洋表面开放连接。由于盆地沃茨的周转缓慢（Deuser，1973年），下沉物质的分解导致约275 m以下的永久缺氧。在这个天然的陆棚沉积物圈闭中保存了一个被广泛用于研究全新世和晚更新世气候变化的极好的沉积物记录。在这方面，Cariaco时间序列提供了关于现代地球化学过程的信息，将作为准确解释这一气候变化沉积档案的基础。（2003- 2008）将产生（1）Cariaco盆地亚热带水下上升流的变化，包括横向运动的时间序列，（2）第一次对Cariaco海盆的各种海面温度代用指标进行了直接校准和同时交叉参照;（3）阐明横向运输和化能自养作为颗粒物来源的相对重要性，（4）评估粒子通量的变化主要是由当地风还是由热带大西洋尺度的区域海洋学过程驱动，以及（5）评估养分有效性/限制的变化是否会导致主要的生态系统变化。通过这个小奖项的资助，来自南卡罗来纳州的研究人员将购买一个额外的沉积物捕集器和相关的用品。该沉积物收集器将添加到我们现有的四个收集器阵列中，并将解决在足够浅的深度（~150 m）没有收集器以准确估计输出通量的问题。 更广泛的影响：Cariaco时间序列计划对美国学生以及加勒比和拉丁美洲的学生和科学家产生了重大的教育影响。美国大学的三名博士生已经完成了Cariaco项目的学位，目前还有四名博士生参与了这项研究。委内瑞拉科学技术部认为CARIACO是委内瑞拉有史以来最重要的海洋学研究计划，并将其作为一个示范计划，为其他学科的资金提供指导。