Chemical Remineralization and the Oceanic Oxygen and Carbon Cycles

小行星9417214 为了更好地了解溶解有机质（DOM）的矿化，本研究将评估CO循环，海洋有机碳的关键物种，通过独立评估其源和汇。 一氧化碳作为示踪剂，用于在方程中预算其他物质： 1 O2 +aDOM+xhv-dHOOH+eCO+ fCO 2 +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位中作为示踪剂进行标定，通过其源在光化学单位中作为示踪剂进行标定。 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CO微生物氧化的巡航和a-f实验室研究的采样将覆盖不同的地点，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沃茨、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）和生产性沿海（加州）沃茨的CALCOFI断面进行。 西雅图-霍巴特巡航将增加一个大规模的太平洋数据集（诺阿/RITS）。 CO气体交换将通过传统方法进行估计; CO微生物氧化将在孵育中测量为CO损失或14 CO2转化。

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.