气候变化领域集成服务门户(CCPortal): Dissolved REE concentrations from Tahiti's island-ocean interface (including submarine groundwater discharge, river, lagoon and coastal waters) and dissolved REE and Nd isotope compositions from three open ocean profiles on the Manihiki Plateau

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.884784
	Dissolved REE concentrations from Tahiti's island-ocean interface (including submarine groundwater discharge, river, lagoon and coastal waters) and dissolved REE and Nd isotope compositions from three open ocean profiles on the Manihiki Plateau
	Molina-Kescher; Mario; Hathorne; Ed C; Osborne; Anne H; Behrens; Melanie K; Kölling; Martin; Pahnke; Katharina; Frank; Martin
发布日期	2018-01-11
数据集类型	dataset
英文简介	The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the contributions of highly reactive basaltic minerals originating from volcanic islands and the role of Submarine Groundwater Discharge (SGD). Here we present dissolved REE concentrations obtained from waters at the island-ocean interface (including SGD, river, lagoon and coastal waters) from the island of Tahiti and from three detailed open ocean profiles on the Manihiki Plateau (including neodymium (Nd) isotope compositions), which are located in ocean currents downstream of Tahiti. Tahitian fresh waters have highly variable REE concentrations that likely result from variable water-rock interaction and removal by secondary minerals. In contrast to studies on other islands, the SGD samples do not exhibit elevated REE concentrations but have distinctive REE distributions and Y/Ho ratios. The basaltic Tahitian rocks impart a REE pattern to the waters characterized by a middle REE enrichment, with a peak at europium similar to groundwaters and coastal waters of other volcanic islands in the Pacific. However, the basaltic island REE characteristics (with the exception of elevated Y/Ho ratios) are lost during transport to the Manihiki Plateau within surface waters that also exhibit highly radiogenic Nd isotope signatures. Our new data demonstrate that REE concentrations are enriched in Tahitian coastal water, but without multidimensional sampling, basaltic island Nd flux estimates range over orders of magnitude from relatively small to globally significant. Antarctic Intermediate Water (AAIW) loses its characteristic Nd isotopic signature (-6 to-9) around the Manihiki Plateau as a consequence of mixing with South Equatorial Pacific Intermediate Water (SEqPIW), which shows more positive values (-1 to -2). However, an additional Nd input/exchange along the pathway of AAIW, eventually originating from the volcanic Society, Tuamotu and Tubuai Islands (including Tahiti), is indicated by an offset from the mixing array of AAIW and SEqPIW to more radiogenic Nd isotope compositions.
空间范围	Median Latitude: -12.406379 * Median Longitude: -159.142491 * South-bound Latitude: -17.769900 * West-bound Longitude: -166.200333 * North-bound Latitude: -3.050000 * East-bound Longitude: -149.163870
时间范围	2007-11-01T00:00:00 - 2012-12-27T08:52:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215270
推荐引用方式 GB/T 7714	Molina-Kescher,Mario,Hathorne,et al. Dissolved REE concentrations from Tahiti's island-ocean interface (including submarine groundwater discharge, river, lagoon and coastal waters) and dissolved REE and Nd isotope compositions from three open ocean profiles on the Manihiki Plateau.2018-01-11.https://doi.org/10.1594/PANGAEA.884784.