Delta13C of particulate organic material in the Southern Ocean

南大洋颗粒有机物质的 Delta13C

• 批准号: 46981005
• 负责人: Professorin Dr. Uta Desy Elisabeth Passow
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/46981005?language=en
• 关键词: Delta13C; particulate; organic; material; Southern

The purpose of this proposal is to identify the exact cause(s) of the anomalously low and variable Southern Ocean δ13Corg and in light of these assess the reliability of δ13C as a paleo-proxy. To effectively answer the proposal theme, main goals of our 3 year project were: (1) Identify the phytoplankton species primarily responsible for the light δ13Corg values observed in the Southern Ocean. (2) Identify possible conditions (size, growth environment) leading to the production of such light material. (3) Analyze the relationships between δ13Corg and other isotopic compositions (δ15N, δ30Si) which are used as paleo-proxies. (4) Assess the value of δ13Corg as a paleo-proxy in view of the above findings. Analysis of cruise data should be complete by the end of 2008/start of 2009. Culture experiments on Southern Ocean diatoms have begun, at different CO2 levels to assess impact on fractionation and uptake kinetics in collaboration with the Membrane Inlet Mass Spectrometry (MIMS) group at AWI. Furiher experiments with the MIMS are planned for 2009, as is analysis of the δ30Si samples collected on ANT-XXIV/3. Release of funds for the third year is requested to allow review of the main PhD goals in light of field and laboratory data in comparison with observations and analyses by other members of the bundle 'Trace elements and their isotopes in the Southern Ocean during the International Polar Year". A large amount of time will be spent on writing the thesis and publications.

该建议的目的是确定南大洋δ 13 Corg异常低和变化的确切原因，并根据这些原因评估δ 13 C作为古代用指标的可靠性。为了有效地回答这个主题，我们的3年项目的主要目标是：（1）确定浮游植物物种的主要负责轻δ 13 Corg值观测在南大洋。(2)确定可能的条件（大小，生长环境），导致这种轻材料的生产。(3)分析δ 13 Corg与其他用作古替代物的同位素组成（δ 15 N、δ 30 Si）之间的关系。(4)根据上述研究结果，评估δ 13 Corg作为古代用指标的价值。对航行数据的分析应在2008年底/2009年初完成。与AWI的膜入口质谱（MIMS）小组合作，在不同的CO2水平下开始了对南大洋硅藻的培养实验，以评估对分馏和吸收动力学的影响。计划于2009年进行MIMS的Furiher实验，并对ANT-XXIV/3上收集的δ 30 Si样品进行分析。要求发放第三年的资金，以便根据实地和实验室数据，并与“国际极地年期间南大洋微量元素及其同位素”项目包其他成员的观测和分析进行比较，审查博士学位的主要目标。大量的时间将用于撰写论文和出版物。