Radiocarbon Studies of Dissolved and Particulate Organic Carbon Cycling in the North Pacific and Antarctic Oceans

北太平洋和南极海洋溶解和颗粒有机碳循环的放射性碳研究

• 批准号: 9501531
• 负责人: James Bauer
• 金额: $ 55.92万
• 依托单位: College of William & Mary Virginia Institute of Marine Science
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-12-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9501531&HistoricalAwards=false
• 关键词: Radiocarbon; Studies; Dissolved; Particulate; Organic

9501531 BAUER Organic carbon pools will be studied at two open ocean sites that reflect potential differences in carbon cycling and transformations in polar and temperate regions. Carbon isotopic signatures ( 14C, 13C) and concentrations of dissolved, colloidal and particulate organic carbon (DOC,COC,POC) will be measured at Station M in the Northeast Pacific Ocean and in the Antarctic Ocean south of the Indian Ocean. The following carbon pools will be studied: ultra-violet and high-temperature catalytically-oxidizable fractions of DOC (DOCuv and DOChtc), suspended and sinking POC (POCsusp and POCsink), COC specific organic constituents (total hydrolyzable amino acids THAA , total carbohydrates TCHO , total lipids) of suspended and sinking POC and of COC, detrital aggregates on the seafloor, marine snow, and dissolved inorganic carbon (DIC). The following questions will be addressed: 1) Do the 14C profiles in Antarctic DOC, POCsusp, and COC support the hypothesis that deep DOC is transported quasi-conservatively through the world's deep ocean? 2) How does the lateral transport of shelf/slope derived organic matter to the deep sea change with time and what is the extent of adsorption of DOC onto POCsusp and POCsink in the water column? 3) From what depths do specific organic constituents of the COC,POCsink, and POCsusp, originate and how are they recycled? 4) What are the sources of carbon to detrital aggregates and marine snow, and are the labile, surface-derived compounds utilized exclusively during remineralization? 5) What is the overall labile and refractory nature of DOC with respect to its heterotrophic utilization, and what does the 14C signature of microheterotrophic biomass reveal about the assimilation of DOC/COC/POC in the deep ocean?

9501531宝华 将在两个公海地点研究有机碳库，这反映了极地和温带地区碳循环和转化的潜在差异。 碳同位素特征 将在东北太平洋的M站和印度洋南部的南极海洋测量溶解、胶体和颗粒有机碳（DOC、COC、POC）的浓度（14 C、13 C）和浓度。 将研究以下碳集合：DOC的紫外线和高温可催化氧化部分（DOCuv和DOChtc），暂停和下沉POC（POCsusp和POCsink），COC特定有机成分（总水解氨基酸THAA、总碳水化合物TCHO、总脂质）的悬浮和下沉POC和COC、海底碎屑聚集体、海洋雪，溶解无机碳（DIC） 1）南极DOC、POCsusp和COC中的14 C剖面是否支持深海DOC准保守地通过世界深海输送的假设？2)陆架/陆坡有机质向深海的横向输运如何随时间变化，以及DOC在水柱中POCsusp和POCsink上的吸附程度如何？3)COC、POCsink和POCsusp的特定有机成分来自什么深度？它们是如何回收的？ 4)碎屑聚集体和海洋雪的碳源是什么？不稳定的、表面衍生的化合物是否仅在矿化过程中被利用？5)什么是整体的不稳定和难治性的DOC就其异养利用，以及微异养生物量的14 C签名揭示了DOC/COC/POC在深海中的同化？