Cycling of Dissolved Oceanic Matter in the Equatorial Pacific

作为美国JGOFS赤道太平洋项目的一部分，溶解有机碳（DOC）和溶解有机氮（DON）将通过新的高温催化氧化技术进行测量。调查测量将提供急需的数据，用于限制碳通量的上层海洋模型，并确定赤道上层海洋中DOC和DON浓度是否随季节变化。船上的孵化研究将(1)试图观察自然种群中溶解有机物的净产量，(2)测量细菌氧化速率，(3)结合DOC和DON测量，确定生物不稳定物质的C/N比。溶解物质的碳氮比将提供有关溶解有机碳库中生物不稳定部分性质的急需信息。巡航后的孵化研究将着眼于DOC和DON的长期稳定性，以及C/N比率是否会随着细菌再矿化有机物而变化。额外的实验将解决保存DOC和DON样品以供将来分析的问题，以及在储存过程中是否会发生变化。这些研究将与其他美国JGOFS研究人员合作进行。

Both dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) will be measured by the new high-temperature catalytic oxidation technique as part of the U.S. JGOFS Equatorial Pacific Program. Survey measurements will provide critically needed data for constraining upper ocean models of the carbon flux and to determine if DOC and DON concentrations vary seasonally in the upper ocean at the equator. On board incubation studies will (1) attempt to observe net production of dissolved organic matter by natural populations, (2) measure bacterial oxidation rates and (3) by combining DOC and DON measurements, determine the C/N ratio of the biologically labile material. The C/N ratio of the dissolved material will provide critically needed information regarding the nature of the biologically labile fraction of the dissolved organic carbon pool. Post-cruise incubation studies will look at long-term stability of DOC and DON and whether the C/N ratio changes as bacteria remineralize organic matter. Additional experiments will address problems of saving DOC and DON samples for future analysis and whether changes occur during storage. These studies will be conducted in collaboration with other U.S. JGOFS investigators.