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Tracing continental weathering and water mass mixing in the Atlantic sector of the Southern Ocean with neodymium and hafnium isotopes

用钕和铪同位素追踪南大洋大西洋部分的大陆风化和水团混合

基本信息

批准号：
44458670
负责人：
Professor Dr. Martin Frank
金额：
--
依托单位：
GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
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 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/44458670?language=en
关键词：
Tracing continental weathering water mass

项目摘要

The subject of this study is a detailed investigation of the distribution of neodymium (Nd) and hafnium (Hf) isotopes in dissolved and particulate form in the water column of the Atlantic sector of the Southern Ocean. Nd isotopes have been shown to be a powerful geochemical tracer for present and past water masses in the ocean. The combination with Hf isotopes was applied for the characterization of continental weathering regimes. So far there are, however, nearly no data for the water column of the Southern Ocean, which severely restricts the reliable application of this combination of tracers for present day studies and reconstructions of the past. We collected large volume water samples and the suspended particulate fraction from the same locations during RV Polarstern Expedition ANT XXIV/3 along the Zero meridian and further across the Weddell Sea and the Drake Passage. We will determine the isotope composition of Nd and for the first time Hf in dissolved and particulate form to characterize the isotope composition of the different Southern Ocean water masses and their sources and to gain new insight into the influence of Antarctic weathering processes on the geochemical properties of the Southern Ocean. These data will serve as a basis for more reliable application of these isotopes as tracers in paleo-oceanography.

本研究的主题是详细调查的钕（Nd）和铪（Hf）同位素的溶解和颗粒形式的水柱的南大洋大西洋部门的分布。Nd同位素已被证明是海洋中现在和过去水团的一种强有力的地球化学示踪剂。与Hf同位素的组合被应用于大陆风化体系的表征。然而，到目前为止，几乎没有关于南大洋水柱的数据，这严重限制了这种示踪剂组合在当今研究和重建过去方面的可靠应用。我们收集了大量的水样和悬浮颗粒部分从相同的位置在RV Polarstern远征ANT XXIV/3沿着零子午线，并进一步跨越威德尔海和德雷克海峡。我们将确定Nd的同位素组成，并首次以溶解和颗粒形式的Hf来表征不同南大洋水团及其来源的同位素组成，并获得新的见解南极风化过程对南大洋地球化学性质的影响。这些数据将作为这些同位素作为古海洋学示踪剂的更可靠应用的基础。