The Relationship of Bioturbation, Macrobenthos and Seabed Radionuclides to the Flux and Fate of Organic Carbon Along the JGOFS Equatorial Pacific Transect

生物扰动、大型底栖动物和海底放射性核素与 JGOFS 赤道太平洋断面有机碳通量和归宿的关系

• 批准号: 9024382
• 负责人: David DeMaster
• 金额: $ 15.37万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-10-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9024382&HistoricalAwards=false
• 关键词: Relationship; Bioturbation; Macrobenthos; Seabed; Radionuclides

In 1991-1992, the US JGOFS Equatorial Pacific program will study the production, flux and fate of organic carbon along a cross-equatorial transect at 140oW. From the equator northward, this transect traverses a steep gradient in particulate organic-carbon flux and burial at the abyssal seafloor. In order to elucidate the fate of organic carbon in these sediments, an understanding of bioturbation and seabed particle dynamics (as traced by naturally occurring radionuclides) is essential. The P.I.'s propose to test, along this carbon-flux gradient, four hypotheses of biogoechemical significance: (1) bioturbation rates and depths vary with annual particulate organic-carbon (POC) flux to the seafloor, (2) these variations have a significant impact on the mineralization and burial of organic carbon in the seabed, (3) macrobenthic standing crop and mean body size are correlated with annual POC flux, and (4) seabed inventories of excess 234Th, 228Th and 210Pb are correlated with POC flux on 100-d, 10-yr and 100-yr time scales, respectively.

1991-1992年，美国JGOFS赤道太平洋计划将研究沿140oW跨赤道样线的有机碳的产生、通量和归宿。 从赤道向北，这条横断面穿过深海海底颗粒有机碳通量和埋藏的陡峭梯度。 为了阐明这些沉积物中有机碳的命运，了解生物扰动和海底粒子动力学（通过天然存在的放射性核素追踪）至关重要。 PI建议沿着这个碳通量梯度测试四个具有生物地球化学意义的假设：（1）生物扰动速率和深度随着每年进入海底的颗粒有机碳（POC）通量而变化，（2）这些变化对海底有机碳的矿化和埋藏有显着影响，（3）大型底栖作物和平均体型相关 (4) 海底过量 234Th、228Th 和 210Pb 的库存量分别与 100 天、10 年和 100 年时间尺度上的 POC 通量相关。