Chemical Remineralization and the Oceanic Oxygen and Carbon Cycles

9417214 Zafiriou 为了更好地了解溶解有机物 (DOM) 的矿化，本研究将通过独立评估其来源和汇来评估二氧化碳循环（海洋有机碳中的关键物种）。 CO 用作预算方程中其他物质的示踪剂：1O2 aDOM xhv---dHOOH eCO fCO2 chv-DOM（hv=光子，hv-DOM=光改变溶解的有机物）。 混合层中微生物氧化和气体交换产生的 CO 产生和 CO 损失可以等同。 因此，混合层 CO 可以通过其汇在海洋地球化学单元中作为示踪剂进行校准，并通过其源在光化学单元中进行校准。 然后确定方程中的项 a-f 允许使用它们的比率来预算其他光反应物和光产物项。 限制二氧化碳微生物氧化的游轮以及用于 a-f 实验室研究的采样将覆盖不同地点，以便在全球范围内推广。 时间序列研究将在受高纬度河流影响的当地沿海水域、驱动光处理的光学特性随季节变化的北大西洋环流（百慕大）以及多产沿海水域（加利福尼亚州）的 CALCOFI 断面进行。 西雅图-霍巴特航线将添加大规模太平洋数据集 (NOAA/RITS)。 CO气体交换将通过传统方法估算； CO 微生物氧化将在培养过程中通过 CO 损失或 14CO2 转化来测量。

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.