Chemical Remineralization and the Oceanic Oxygen and Carbon Cycles

化学再矿化与海洋氧和碳循环

• 批准号: 9417214
• 负责人: Oliver Zafiriou
• 金额: $ 54.58万
• 依托单位: Woods Hole Oceanographic Institution
• 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 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9417214&HistoricalAwards=false
• 关键词: Chemical; Remineralization; Oceanic; Oxygen; Carbon

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.

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。