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

北冰洋近地表沉积物的耗氧量、反硝化作用和碳氧化速率

• 批准号: 9400058
• 负责人: John Christensen
• 金额: $ 14.3万
• 依托单位: Bigelow Laboratory for Ocean Sciences
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-05-01 至 1997-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9400058&HistoricalAwards=false
• 关键词: Oxygen; Consumption; Denitrification; Carbon; Oxidation

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.

9400058这笔赠款支持的克里斯滕森研究是在北极系统科学（ARCSS）全球变更研究计划的主持下，并由海洋科学司和极地计划办公室共同赞助。 这项研究将集中在一次独特而密集的多学科研究探险中，前往从未经过广泛研究的北极海洋部分。 1994年的美国/加拿大北极海洋区是与加拿大的一项合作努力，在1994年夏季，大约有60位加拿大和美国破冰船的科学家。NSF资助的项目将集中在水文，生物学，古冰和海冰研究上。 收集到的数据将是有史以来第一个来自北极海洋多个地区的数据之一，并将与我们提高我们对北极的理解高度相关，是改变全球气候条件及其如何影响温带海洋和地区的物理，化学和生物学特征的指标。 这项工作是协作生物学计划的组成部分。 将进行研究，以确定沿邮轮沿线沉积物中的氧气消耗和碳氧化的速率。 据说沉积氧化速率与上覆有机物的可用有机物的通量有关。 因此，它是初级生产和可能从边际区域运输碳和养分的指标。 将采取一系列盒子和活塞芯，并提供一些PIS的子样本。 测量将由关键的生物地球化学溶质（氧，营养素，碱度，pH，可溶性铁和锰，硫酸盐，氯化物，钙，镁，硫化物（如果存在））以及孔隙率，孔隙率，表面积，有机碳和硝酸盐和碳酸盐等固体组成。 要采样的地点包括大陆架子，斜坡，深渊平原和中巴拜山脊。 数据将用于评估沉积物的水通量，并估计消耗氧，丹尼特里的含量和碳氧化速率。 信息将对北极和全球海洋中的碳预算和氮预算有了更大的了解。