Collaborative Research: Particulate Organic Carbon Fluxes and Sediment Accumulation in the Cariaco Basin

合作研究：卡里亚科盆地颗粒有机碳通量和沉积物堆积

• 批准号: 0118349
• 负责人: Robert Thunell
• 金额: $ 29.48万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-10-01 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0118349&HistoricalAwards=false
• 关键词: Collaborative; Research; Particulate; Organic; Carbon

ABSTRACTOCE-0118349The Cariaco Basin is a 1,400-m deep depression on the continental shelf off Venezuela in which anoxic waters cover laminated sediments with high organic matter content (1-5 wt%). These laminae, which result from seasonal variations in primary productivity and terrigenous sediment input along the southern the Caribbean Sea, contain a high-resolution record of past climate change in the tropical Atlantic Ocean. In this collaborative effort, researchers at the University of South Florida (USF), the University of South Carolina (USC), and the State University of New York (SUNY) seek to integrate hydrographic, primary productivity, water column microbial activity, vertical particulate flux, and sediment accumulation rate measurements in the Cariaco Basin into a synthesis to understand how contemporary sedimentation patterns reflect this climatic and oceanographic variability. The central objective is to understand the factors that control the relationship between primary production and the vertical flux of particles in the Cariaco Basin. This project will continue the current time series of monthly observations at 10'30' N, 64'40' W that began in November, 1995, under the CARIACO (CArbon Retention In A Colored Ocean) Program. This includes continuing deployment of a mooring with four sediment traps (275, 350, 450, and 1,200 m) to provide bi-weekly sample collections at each depth. Complementing the traps will be a mooring with two Acoustic Doppler Current Profilers (ADCP), one looking up and the other looking down from a depth of about 250 m, to measure currents from below the sill depth to the surface for a three-year period. Each year, one transect will be conducted between the CARIACO station and 11'40' N, 64'40' W outside the basin, to help understand the characteristics of source water involved in intrusions and upwelling. Regional wind and sea level will be examined using both local and remotely-sensed data to establish whether forcing for upwelling occurs primarily through local or gyre-scale processes. Sediments from the Cariaco basin will be collected and analyzed to reconstruct the oceanographic condition in the Cariaco Basin over the past century and provide a window for longer-scale paleoceanographic studies. The program is significant because it provides groundtruthing needed for proper interpretation of past climate changes recorded in the Cariaco sediments.

ABSTRACTOCE-0118349卡里亚科盆地是委内瑞拉沿海大陆架上一个 1,400 米深的洼地，其中缺氧水域覆盖了有机质含量高（1-5 wt%）的层状沉积物。这些纹层是由加勒比海南部初级生产力和陆源沉积物输入的季节性变化造成的，包含了热带大西洋过去气候变化的高分辨率记录。在这项合作中，南佛罗里达大学 (USF)、南卡罗来纳大学 (USC) 和纽约州立大学 (SUNY) 的研究人员寻求将卡里亚科盆地的水文学、初级生产力、水柱微生物活动、垂直颗粒通量和沉积物积累率测量结果整合到一个综合体中，以了解当代沉积模式如何反映这种气候和海洋变化。 中心目标是了解控制卡里亚科盆地初级生产与颗粒垂直通量之间关系的因素。该项目将继续在 CARIACO（彩色海洋中的碳保留）计划下于 1995 年 11 月开始的当前北纬 10'30'、西经 64'40' 每月观测的时间序列。这包括继续部署带有四个沉积物收集器（275、350、450 和 1,200 m）的系泊装置，以在每个深度提供每两周一次的样本收集。与陷阱相辅相成的是系泊装置，配有两台声学多普勒海流剖面仪 (ADCP)，一台向上看，另一台从约 250 m 的深度向下看，以测量从窗台深度以下到水面的水流，为期三年。 每年，都会在 CARIACO 站和盆地外北纬 11'40'、西经 64'40' 之间进行一次横断面测量，以帮助了解侵入和上升流所涉及的水源水的特征。将使用当地和遥感数据检查区域风和海平面，以确定上升流的强迫是否主要通过当地或环流规模的过程发生。 将收集并分析卡里亚科盆地的沉积物，以重建卡里亚科盆地近百年来的海洋状况，为更长期的古海洋学研究提供窗口。该计划意义重大，因为它提供了正确解释卡里亚科沉积物中记录的过去气候变化所需的基础事实。