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

9501531鲍尔有机碳库将在两个公海地点进行研究，这两个地点反映了极地和温带地区碳循环和转化的潜在差异。将在东北太平洋M站和印度洋以南的南极海洋测量碳同位素特征(14C、13C)以及溶解有机碳、胶体有机碳和颗粒有机碳的浓度(DOC、COC、POC)。将研究以下碳库：DOC的紫外线和高温可催化氧化部分(DOCuv和DOChtc)、悬浮和下沉的POC(POCsusp和POCink)、悬浮和下沉的POC和COC的特定有机成分(可水解氨基酸总量、总碳水化合物TCHO、总脂)、海底碎屑聚集体、海洋雪和溶解无机碳(DIC)。以下问题将被讨论：1)南极DOC、POCsusp和COC中的14C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/斜坡来源的有机质向深海的横向输送是如何随时间变化的，以及DOC在水柱中的吸附程度如何？3)COC、POCsusp和POCsusp的特定有机成分来自什么深度，它们是如何循环的？4)碎屑聚集体和海洋雪的碳来源是什么，以及不稳定，表面衍生化合物仅在再矿化过程中使用？5)就DOC的异养利用而言，DOC的总体不稳定和难降解的性质是什么，微异养生物的14C特征揭示了深海中DOC/COC/POC的同化作用？

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?