Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.gca.2016.06.001 |
Hawaiian imprint on dissolved Nd and Ra isotopes and rare earth elements in the central North Pacific: Local survey and seasonal variability | |
Froellje, Henning1; Pahnke, Katharina1; Schnetger, Bernhard2; Brumsack, Hans-Juergen2; Dulai, Henrietta3; Fitzsimmons, Jessica N.4,5 | |
通讯作者 | Froellje, Henning |
来源期刊 | GEOCHIMICA ET COSMOCHIMICA ACTA
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ISSN | 0016-7037 |
EISSN | 1872-9533 |
出版年 | 2016 |
卷号 | 189页码:110-131 |
英文摘要 | Dissolved neodymium isotopes (Nd-143/Nd-144, expressed as epsilon(Nd)) and rare earth elements (REEs) have the potential to trace the provenance of lithogenic material as well as water masses. The central North Pacific is poorly investigated with respect to its Nd isotope signature and REE cycling, and little is known about the contributions of volcanic islands, such as Hawaii, relative to dust input from Asian deserts to the surface water REE budgets. Here we present dissolved Nd isotope and REE data along with long-lived radium isotope activities from Hawaii Ocean Time-Series Station ALOHA and coastal waters from Oahu, sampled for a GEOTRACES process study in February 2011. The data are supplemented with seasonal samples from ALOHA. Our results show a clear influence of the Hawaiian Islands on the coastal ocean and surface waters at ALOHA during February, expressed by higher surface water Ra activities, radiogenic surface epsilon(Nd) (epsilon(Nd) = +1.4 to -1.0), and elevated Eu anomalies (Eu/Eu* >= 1.3). Seasonal cycles of Asian dust deposition most likely contribute to the seasonal epsilon(Nd) variability of surface waters at ALOHA, as suggested by more negative epsilon(Nd) and the lack of Eu anomalies in summer. Neodymium isotopes in the intermediate and deep water column at ALOHA trace typical North Pacific water masses, such as North Pacific Intermediate Water and North Pacific Deep Water. We suggest that a radiogenic epsilon(Nd) excursion in 1000-2000 m water depth, observed in various North Pacific profiles, is controlled by advection of a modified Upper Circumpolar Deep Water or North Equatorial Pacific Intermediate Water. We further present an updated average epsilon(Nd) signature of -3.5 +/- 0.5 for North Pacific Deep Water and show that REE patterns of deep waters at ALOHA are dominantly controlled by vertical processes. (C) 2016 Elsevier Ltd. All rights reserved. |
英文关键词 | Neodymium isotopes Rare earth elements GEOTRACES Dust North Pacific Hawaii HOT-ALOHA |
类型 | Article |
语种 | 英语 |
国家 | Germany ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000380753100007 |
WOS关键词 | SUBMARINE GROUNDWATER DISCHARGE ; CROSS-FLOW FILTRATION ; PAST OCEAN CIRCULATION ; SERIES STATION ALOHA ; EASTERN INDIAN-OCEAN ; INTERMEDIATE WATER ; NEODYMIUM ISOTOPES ; GEOTRACES INTERCALIBRATION ; TEMPORAL VARIABILITY ; SR-87/SR-86 RATIOS |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/193171 |
作者单位 | 1.Carl von Ossietzky Univ Oldenburg, Max Planck Res Grp Marine Isotope Geochem, Inst Chem & Biol Marine Environm ICBM, Carl von Ossietzky Str 9-11, D-26129 Oldenburg, Germany; 2.Carl von Ossietzky Univ Oldenburg, Microbiogeochem, Inst Chem & Biol Marine Environm ICBM, Carl von Ossietzky Str 9-11, D-26129 Oldenburg, Germany; 3.Univ Hawaii, Sch Ocean & Earth Sci & Technol, Dept Geol & Geophys, 1680 East West Rd, Honolulu, HI 96822 USA; 4.MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 5.Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA |
推荐引用方式 GB/T 7714 | Froellje, Henning,Pahnke, Katharina,Schnetger, Bernhard,et al. Hawaiian imprint on dissolved Nd and Ra isotopes and rare earth elements in the central North Pacific: Local survey and seasonal variability[J],2016,189:110-131. |
APA | Froellje, Henning,Pahnke, Katharina,Schnetger, Bernhard,Brumsack, Hans-Juergen,Dulai, Henrietta,&Fitzsimmons, Jessica N..(2016).Hawaiian imprint on dissolved Nd and Ra isotopes and rare earth elements in the central North Pacific: Local survey and seasonal variability.GEOCHIMICA ET COSMOCHIMICA ACTA,189,110-131. |
MLA | Froellje, Henning,et al."Hawaiian imprint on dissolved Nd and Ra isotopes and rare earth elements in the central North Pacific: Local survey and seasonal variability".GEOCHIMICA ET COSMOCHIMICA ACTA 189(2016):110-131. |
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