U.S. Global Repeat Hydrographic/CO2/Tracer Surveys: Deep Ocean DOM Distribution and Dynamics

通过该奖项的资助，迈阿密大学和加州大学-圣巴巴拉分校的研究人员将继续作为美国重复水文计划的参与者研究世界海洋中的溶解有机碳（DOC）。 美国Repeat Hydrography计划的主要科学目标是为模型校准和验证、碳系统研究、热量和淡水储存和通量研究以及深水和浅水质量通风研究提供数据。该项目旨在进一步确定和了解控制DOC深海分布的过程。DOC分布的三个特别重要的控制因素是：1）DOC从表层的出口与向下混合的水团，2）DOC浓度的非保守变化的生物和非生物过程，和3）保守的变化，DOC浓度由于水团的混合。为了区分和评估这些过程，研究小组将在水文计划的4个主要海洋断面（2006-2008年期间）进行一级（计划强制性）DOC测量。这一项目将对在全球气候变化背景下研究行星碳循环产生更广泛的影响。 美国重复水文计划是美国气候变化和大气研究计划和美国碳循环科学计划的结果，该计划呼吁将沿着海洋部分的国家观测计划与国际计划相结合。美国碳循环科学计划的大规模观测部分确定了对海洋碳进行系统观测的必要性，捕捉这些变量的空间和长期时间变异性。学生将充分参与该项目实地部分的实施。迄今为止，迈阿密大学的本科生已经参加了所有的重复水文学巡航。参加这些巡航有助于学生满足课程要求，并使他们接触到跨学科的海洋学。这种实践经验对学习过程是非常宝贵的，到目前为止，对参与的学生来说是有益的，为未来的工作提供了很好的背景。

With funding through this award, researchers at the University of Miami and at the University of California - Santa Barbara will continue their studies of dissolved organic carbon (DOC) in the world ocean as participants in the U.S. Repeat Hydrography Program. The primary scientific objective of the U.S. Repeat Hydrography program is to provide data for model calibration and validation, carbon system studies, heat and freshwater storage and flux studies, and deep and shallow water mass ventilation studies. This project seeks to further identify and understand processes controlling the deep ocean distribution of DOC. Three controls on DOC distributions of particular importance are: 1) Export of DOC from the surface layer with downward mixing of water masses, 2) non-conservative changes in DOC concentrations by biotic and abiotic processes, and 3) conservative changes in DOC concentrations due to mixing of water masses. To differentiate and assess these processes, the research team will make Level I (mandatory to the program) measurements of DOC on 4 major ocean sections (during 2006-2008) of the Hydrography Program. This project will have broader impacts in the study of the planetary carbon cycle in the context of global climatic change. The US Repeat Hydrography program results from the joint US CLIVAR and US Carbon Cycle Science Program call for a national program of observations along ocean sections to be integrated with international plans. The large-scale observation component of the US Carbon Cycle Science Plan defined a need for systematic observations of carbon in the ocean, capturing the spatial and long-term temporal variability in those variables. Students will be fully involved in implementation of the field component of the project. University of Miami undergraduate students have been on all of the Repeat Hydrography cruises to date. Participating on these cruises helps students meet curricular requirements and exposes them to interdisciplinary oceanography. This hands-on experience is invaluable to the learning process and has been rewarding to the students involved so far, providing excellent context for future work.