Chemical Remineralization and the Oceanic Oxygen and Carbon Cycles
Chemical Remineralization and the Oceanic Oxygen and Carbon Cycles
批准号:
9417214
负责人:
Oliver Zafiriou
金额:
$54.58万
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 2000-05-31
中文摘要
为了更好地了解溶解有机质(DOM)的矿化过程,本研究将通过独立评估海洋有机碳的来源和汇,对海洋有机碳中的关键物种CO循环进行评估。CO作为示踪剂,用于预测方程式中的其他物质:1O2+aDOM+xhv- dHOOH+eCO+fCO2+chv-DOM (hv=光子,hv- dom =光改变的溶解有机物)。混合层中微生物氧化和气体交换产生的CO产量和CO损失可以相等。因此,混合层CO可以作为示踪剂在海洋地球化学单元中通过其汇进行校准,在光化学单元中通过其源进行校准。然后确定方程式中的a-f项,允许使用它们的比率来预算其他光反应物和光生成物项。限制CO微生物氧化的巡航和对a-f的实验室研究取样将覆盖不同的地点,以便在全球推广。时间序列研究将在受高纬度河流影响的当地沿海水域、驱动光过程的光学特性随季节变化的北大西洋环流(百慕大)和生产力丰富的沿海水域(加利福尼亚)的CALCOFI样带进行。西雅图至霍巴特的巡航将增加一个大规模的太平洋数据集(NOAA/RITS)。CO气体交换将采用传统方法进行估算;CO微生物氧化将在培养中测量CO损失或14CO2转化。
英文摘要
9417214 Zafiriou To better understand the mineralization of dissolved organic matter (DOM) this study will assess the CO cycle, a key species in the marine organic carbon, by evaluating independently its sources and sinks. CO serves as a tracer for budgeting other substances in the equation: 1O2+aDOM+xhv---dHOOH+eCO+fCO2+chv-DOM (hv=photons, hv-DOM=light altered dissolved organic matter). CO production and CO losses by microbial oxidation and gas exchange in the mixed layer can be equated. Thus mixed- layer CO can be calibrated as a tracer in marine geochemical units via its sinks, and in photochemical units via its source. Then determining the terms a-f in the equation permits using their ratios to budget other photo-reactant and photo-product terms. Cruises constraining CO microbial oxidation, and sampling for laboratory studies of a-f will cover varied sites to allow generalizing globally. Time-series studies will be done in local coastal waters influenced by high- latitude rivers, the N.Atlantic gyre where optical properties driving photoprocesses vary seasonally (Bermuda) and on CALCOFI transects in productive coastal (California) waters. A Seattle-Hobart cruise will add a large-scale Pacific data set (NOAA/RITS). CO gas exchange will be estimated by traditional methods; CO microbial oxidation will be measured in incubations as CO loss or conversion of 14CO2.
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会议论文
Photochemical Formation of Carbon Dioxide from Dissolved Organic Matter: A New Approach to Constraining a Major Term in Marine Carbon Cycling
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批准号:0223200
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项目类别:Standard Grant
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资助金额:$0.0万
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财政年份:2002
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负责人:Oliver Zafiriou
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依托单位:
Sunlight-Induced Electron Ejection in Natural Waters
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批准号:0099027
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项目类别:Standard Grant
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资助金额:$15.95万
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财政年份:2001
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负责人:Oliver Zafiriou
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依托单位:
Collaborative Research: The Effects of Aquatic Photochemistry on the Proton and Metal Binding Properties of Dissolved Organic Matter in Freshwater Systems
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批准号:0087695
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项目类别:Standard Grant
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资助金额:$8.51万
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财政年份:2001
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负责人:Oliver Zafiriou
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依托单位:
Collaborative Research: Diel Biogeochemical Cycling of CO, OCS, and HOOH in the Sargasso Sea: Measuring and Modeling Distributions, Fluxes, and Processes
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批准号:9811208
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项目类别:Continuing Grant
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资助金额:$39.34万
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财政年份:1998
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负责人:Oliver Zafiriou
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依托单位:
Effect of Superoxide on Copper and Iron Speciation in Marine Systems
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批准号:9529448
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项目类别:Continuing Grant
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资助金额:$11.55万
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财政年份:1996
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负责人:Oliver Zafiriou
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依托单位:
Photochemical Oxygen Consumption in Marine Waters
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批准号:9115608
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项目类别:Continuing Grant
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资助金额:$30.14万
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财政年份:1992
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负责人:Oliver Zafiriou
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依托单位:
Nitrification Rates and Controls: The Deep Oligotropic Nitrogen Cycle
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批准号:9000217
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项目类别:Continuing Grant
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资助金额:$62.2万
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财政年份:1990
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负责人:Oliver Zafiriou
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依托单位:
Marine Photochemistry: Free Radicals and Reactions
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批准号:8700576
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项目类别:Continuing Grant
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资助金额:$24.01万
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财政年份:1987
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负责人:Oliver Zafiriou
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依托单位:
Biogeochemistry of Nitric Oxide and Other Trace Species in the Nitrogen Cycle
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批准号:8601618
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项目类别:Continuing Grant
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资助金额:$39.75万
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财政年份:1986
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负责人:Oliver Zafiriou
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依托单位:
Marine Photochemistry: Free Radical Sources and Reactions
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批准号:8417770
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项目类别:Continuing Grant
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资助金额:$24.48万
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财政年份:1985
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负责人:Oliver Zafiriou
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依托单位:
Marine Photochemistry: Free Radical Sources and Reactions
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批准号:8215614
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项目类别:Continuing Grant
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资助金额:$18.17万
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财政年份:1983
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负责人:Oliver Zafiriou
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依托单位:
Biogeochemistry of Nitric Oxide
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批准号:8300022
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项目类别:Continuing Grant
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资助金额:$38.11万
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财政年份:1983
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负责人:Oliver Zafiriou
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依托单位:
Chemical Effects of Light in the Sea
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批准号:8110160
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项目类别:Continuing Grant
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资助金额:$12.45万
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财政年份:1981
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负责人:Oliver Zafiriou
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依托单位:
Chemical Effects of Light in the Sea
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批准号:7909381
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项目类别:Continuing Grant
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资助金额:$18.75万
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财政年份:1979
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负责人:Oliver Zafiriou
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依托单位:
Atmospheric and Air-Sea Interactive Chemistry in the Central Equatorial Pacific
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批准号:7800997
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项目类别:Standard Grant
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资助金额:$0.94万
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财政年份:1978
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负责人:Oliver Zafiriou
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依托单位:
Chemical Effects of Light in the Sea
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批准号:7708696
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项目类别:Continuing Grant
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资助金额:$12.91万
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财政年份:1977
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负责人:Oliver Zafiriou
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依托单位:
Instructional Scientific Equipment Program
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批准号:7416159
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项目类别:Standard Grant
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资助金额:$0.2万
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财政年份:1974
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负责人:Oliver Zafiriou
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依托单位:
Organic Chemistry of the Sea: Complexity of Composition and Of Chemical Processes
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批准号:7422781
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项目类别:Continuing Grant
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资助金额:$16.83万
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财政年份:1974
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负责人:Oliver Zafiriou
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依托单位:
Chemical Effects of Light in the Sea
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批准号:7201553
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项目类别:Standard Grant
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资助金额:$14.2万
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财政年份:1972
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负责人:Oliver Zafiriou
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依托单位:
海外基金