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: 0118566
• 负责人: Frank Muller-Karger
• 金额: $ 74万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Standard 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=0118566&HistoricalAwards=false
• 关键词: Collaborative; Research; Particulate; Organic; Carbon

ABSTRACTOCE-0118566The 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-0118566 Cariaco盆地对委内瑞拉岛的大陆架深凹处是1,400米，其中缺氧水覆盖了具有高有机物含量的层压沉积物（1-5 wt％）。这些薄片是由加勒比海南部的一级生产率和陆源沉积物输入的季节性变化产生的，它包含了热带大西洋过去气候变化的高分辨率记录。在这项合作努力中，南佛罗里达大学（USF），南卡罗来纳大学（USC）和纽约州立大学（SUNY）的研究人员试图整合水文，初级生产力，水柱微生物活动，垂直颗粒物和沉积物的累积速率衡量标准，以了解这一概述，以了解这一质量的变化。 核心目标是了解控制主要生产与粒子盆地颗粒垂直通量之间关系的因素。该项目将继续在1995年11月的Cariaco（彩色海洋中保留碳保留）计划下，在1995年11月开始的10'30'n，64'40'W的当前时间序列。这包括继续部署有四个沉积物陷阱（275、350、450和1,200 m）的系泊设备，以在每个深度提供每两周的样品收集。补充陷阱将是两个声学多普勒电流轮廓器（ADCP）的系泊，一个抬头向上抬头，另一个从约250 m的深度向下看，以测量从窗台深度下方到表面的电流，为期三年。 每年，Cariaco站和盆地外的11'40'n，64'40 w之间都会进行一个横断面，以帮助了解涉及入侵和上升的源水的特征。区域风和海平面将使用局部和远程敏感的数据进行检查，以确定上升的强迫是否主要通过本地或回旋规模的过程发生。 将收集和分析来自Cariaco盆地的沉积物，以重建过去一个世纪的Cariaco盆地中的海洋学状况，并为长期尺度的古环学研究提供了一个窗口。该计划很重要，因为它提供了对Cariaco沉积物中记录的过去气候变化的正确解释所需的地面拖延。