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

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
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1994
资助国家:
美国
项目状态:
已结题
起止时间:
1994-12-01 至 1998-10-31

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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?
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Collaborative Research: Constraining the sources, ages and alteration of dissolved and particulate lipids in estuarine and coastal organic matter
  • 批准号:
    0961860
  • 项目类别:
    Standard Grant
  • 资助金额:
    $34.92万
  • 财政年份:
    2010
  • 负责人:
    James Bauer
  • 依托单位:
COLLABORATIVE RESEARCH: IMPACT OF DOM SOURCE AND PHOTOOXIDATION ON CARBON CYCLING IN ESTUARIES
Collaborative Research: Delivery and Fate of Old Terrestrial Organic Carbon in a Riverine Ecosystem
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