U.S.-Norway Program: Dissertation Research in Biological Oceanography

9403610罗曼这个奖项提供了博士学位的论文研究费用的部分支持保罗罗曼的角点环境实验室的马里兰州大学的博士生。 研究生Juanita Urban-Rich女士将与挪威特罗姆瑟大学和卑尔根大学的教员合作进行海洋学研究。 她将参加挪威北方海域的一系列研究巡航，这些研究与挪威关于北极沃茨颗粒通量和碳循环的两个主要研究项目有关。 这将使她有机会收集宝贵的数据，为她的论文研究所作的贡献浮游动物粪便颗粒颗粒通量和碳循环在不同的地理位置。 她将进行实验，以测量化学成分和溶解颗粒有机碳溶解有机碳从粪便颗粒和“海洋雪”，有机和无机碎屑的聚合物。 她希望确定这两种形式的碎屑在腐烂时是否会向深海沃茨和沉积物提供显著不同形式的有机碳，这可能是由于不同的腐烂速率、不同的成分或颗粒转化为溶解有机碳的差异。 这些数据将与她将在其他赞助下在阿拉伯海收集的数据进行比较。 大型浮游动物粪粒和海洋雪是有机碳以及营养物质、污染物和微量金属从上层海洋到深水和沉积物的重要运输者。 然而，这种贡献可以采取几种途径，并随季节变化。 除了对垂直通量的贡献外，它们还是其他动物的重要食物来源。 增加对这些有机颗粒的组成和命运的了解将有助于改进模型和理解全球地球化学循环。

9403610 Roman This award provides partial support for dissertation research expenses of a PhD student of Dr. Paul Roman of the Horn Point Environmental Laboratory of the University of Maryland. The graduate student, Ms. Juanita Urban-Rich, will carry out oceanographic research in cooperation with faculty of the University of Tromso and the University of Bergen, Norway. She will participate in a series of research cruises off Northern Norway related to two major Norwegian research programs on particle flux and the carbon cycle in Arctic waters. These will give her the opportunity to collect invaluable data for her dissertation research on the contribution made by zooplankton fecal pellets to particle flux and carbon cycles in different geographical locations. She will carry out experiments to measure the chemical composition and dissolution of particulate organic carbon to dissolved organic carbon from fecal pellets and "marine snow", an aggregate of organic and inorganic detritus. She hopes to determine whether the two forms of detritus contribute significantly different forms of organic carbon to abyssal waters and sediments as they decay, due possibly to different decay rates, different composition, or differences in the transformation of particulate to dissolved organic carbon. These data will be compared with data she will collect in the Arabian Sea under other sponsorship. Macrozooplankton fecal pellets and marine snow are important transporters of organic carbon as well as nutrients, pollutants and trace metals from the upper ocean layers to deep water and the sediments. However this contribution can take several paths and it varies seasonally. In addition to this contribution to vertical flux, they are an important food source for other animals. Increased knowledge of the composition and fate of these organic particles will contribute to improved models and understanding of global biogeochemical cycles.