Rare earth elements in seawater during an iron-induced phytoplankton bloom of the western subarctic Pacific (SEEDS-II)

被引：22

作者：

Hara, Yasuko ^{[1
]}

Obata, Hajime ^{[1
]}

Doi, Takashi ^{[1
]}

Hongo, Yayoi ^{[1
]}

Gamo, Toshitaka ^{[1
]}

Takeda, Shigenobu ^{[2
]}

Tsuda, Atsushi ^{[1
]}

机构：

[1] Univ Tokyo, Ocean Res Inst, Nanko Ku, Tokyo 1648639, Japan

[2] Univ Tokyo, Dept Aquat Biosci, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan

来源：

DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY | 2009年 / 56卷 / 26期

关键词：

Rare earth elements; Fe-enrichment experiment; Phytoplankton bloom; Adsorption; Biogenic particle; Nutrient; ECOSYSTEM DYNAMICS; OCEAN; SEA; ENRICHMENT; EXPORT; PARTICLES; NEODYMIUM; BEHAVIOR; CARBON; FERTILIZATION;

D O I：

10.1016/j.dsr2.2009.06.009

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

During an iron-enrichment experiment in the western subarctic Pacific (SEEDS-II), concentrations of dissolved and acid-soluble rare earth elements (REEs) were determined in shallow waters. Detailed vertical profiles of dissolved REEs were compared with those of nutrients in a preliminary survey. The results showed good correlation, except for Ce and Y. Along with phytoplankton growth within the ironenriched patch, dissolved REEs were decreased in surface waters. The changes in REE concentrations were small but systematic: light REEs were adsorbed preferentially over heavy REEs. This systematic trend is consistent with results of earlier studies of REE adsorption onto biogenic particle surfaces. However, we were unable to detect a decrease of acid-soluble REEs in surface waters. During the phytoplankton bloom decline phase, dissolved REEs were elevated to concentration levels at the preliminary survey, although nutrients were decreased. The liberation of REEs from the suspended particles might be related to disaggregation from large particles to colloid particles, desorption from the particulate phase, and remineralization from organic matter. Outside the Fe-patch, time variations of REEs were also observed during SEEDS-II, indicating that both artificially induced phytoplankton blooms and natural variation of biogenic particles can affect the biogeochemical cycles of REEs in shallow waters within a short time. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2839 / 2851

页数：13

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