Oxygen Consumption, Denitrification, and Carbon Oxidation Rates In Near-Surface Sediments of the Arctic Ocean

900058克里斯滕森研究项目由北极系统科学（ARCSS）全球变化研究项目资助，由海洋科学部和极地项目办公室联合赞助。研究将围绕一个独特的和密集的，多学科的研究考察北冰洋的部分，从未被广泛研究过。1994年美国/加拿大北冰洋科是与加拿大的一项合作努力，1994年夏季将有大约60名科学家乘坐加拿大和美国的破冰船。nsf资助的项目将集中于水文、生物学、古和海冰研究。从北冰洋几个地区收集的数据将是有史以来的首批数据之一，这些数据将与提高我们对北极如何成为全球气候条件变化的一个指标，以及它如何影响温带海洋和地区的物理、化学和生物特征的理解高度相关。这项工作是合作生物学项目的一个组成部分。将进行研究，以确定沿巡航路线的沉积物中的氧气消耗和碳氧化率。据说沉积氧化速率与上覆地表水中可用有机质的通量有关。因此，它是一个初级生产和可能的碳和营养物质从边缘地区运输的指标。将采集一系列的箱芯和活塞芯，并向一些pi提供子样品。测量将包括关键的生物地球化学溶质（氧气、营养物、碱度、pH值、可溶性铁和锰、硫酸盐、氯化物、钙、镁、硫化物（如果存在））和固体成分（如孔隙度、表面积、有机碳和氮、碳酸盐）。取样地点包括大陆架、斜坡、深海平原和中盆地脊。这些数据将用于评估沉积物底部的水通量，并估计氧气消耗、反硝化和碳氧化的速率。这些信息将有助于更好地了解北极和全球海洋中的碳收支和氮收支。

9400058 Christensen Research supported by this grant is under the auspices of the Arctic Systems Science (ARCSS) Global Change Research Program and is jointly sponsored by the Division of Ocean Sciences and the Office of Polar Programs. The research will be centered around a unique and intensive, multidisciplinary research expedition to parts of the Arctic Ocean that have never been extensively studied. The 1994 U.S./Canada Arctic Ocean Section is a collaborative effort with Canada that will involve approximately 60 scientists on a Canadian and a U.S. icebreaker during summer 1994. NSF-funded projects will focus on hydrography, biology, paleo-, and sea-ice studies. Data collected will be amongst the first ever from several regions of the Arctic Ocean and will be highly relevant to improving our understanding of how the Arctic is an indicator of changing global climate conditions and how it affects the physical, chemical, and biological features of the more temperate oceans and regions. This work is a component of the collaborative biology program. Research will be undertaken to determine the rates of oxygen consumption and carbon oxidation in sediments along the cruise track. Sedimentary oxidation rates are said to relate to the flux of usable organic matter from overlying surface waters. Hence, it is an indicator of primary production and possible transport of carbon and nutrients from the marginal regions. A series of box and piston cores will be taken and sub-samples provided to a number of PIs. Measurements will be made of key biogeochemical solutes (oxygen, nutrients, alkalinity, pH, soluble iron and manganese, sulfate, chloride, calcium, magnesium, sulfide (if present)) and solid constituents such as porosity, surface area, organic carbon and nitrogen, and carbonate. Sites to be sampled include continental shelves, slopes, abyssal plains, and mid-basin ridges. The data will be used to evaluate sediment-bottom water fluxes and to estimate rates of oxygen consumption, denitri fication, and carbon oxidation. Information will provide a greater understanding of the carbon budget and nitrogen budget in the Arctic and global ocean.