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: 9022116
• 负责人: Craig Smith
• 金额: $ 21.92万
• 依托单位: University of Hawaii
• 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=9022116&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 研究有机碳沿着a的产生、通量和去向 140 oW的跨赤道样带。 从赤道 向北，这条样带穿过一个陡峭的坡度， 颗粒有机碳通量和深海埋藏 海底 为了阐明有机碳在 这些沉积物，了解生物扰动和海底 粒子动力学（如自然发生的 放射性核素）是必不可少的。 私家侦探我们打算测试一下，沿着 这种碳通量梯度，四种生物化学假说 意义：（1）生物扰动速率和深度随 每年向海底的颗粒有机碳（POC）通量， (2)这些变化对 海底有机碳的矿化和埋藏，（3） 大型底栖动物现存量和平均体型之间存在相关性 年POC通量，以及（4）海底过量库存 234 Th、228 Th和210 Pb与100天POC通量相关， 10年和100年的时间尺度分别。