Geochemistry of dissolved rare earth elements in the Equatorial Pacific Ocean
- 162 Downloads
Seawater samples were collected from four locations in the Equatorial Pacific Ocean during the MR02-K06 cruise of the R/V Mirai and analyzed for dissolved rare earth elements (REEs) using inductively coupled plasma mass spectrometry. According to variations of REE concentrations and Yb/La ratios, the results show that the river input of the Papua New Guinea islands may affect the compositions of REEs in the Equatorial Pacific surface water. The Yb/La values and the REE concentrations in the waters deeper than 3,000 m in the western South Pacific and the Equatorial Pacific Oceans, which represent the characteristics of Antarctic Bottom Water (AABW), demonstrate similar variation trend with depth. This result also indicates that the REEs which originated from the South Pacific Ocean have entered the North Pacific Ocean across the equator with AABW intrusion.
KeywordsRare earth elements Equatorial Pacific Ocean Vertical profiles Water mass tracers
The authors would like to thank Dr T. Aono, Dr K. Abe, and the scientific party members, the captain, officers, and the crew of the R/V Mirai during the MR02-K06 (leg 3) cruise for their help in the sampling. The authors also express special thanks to Mr K. Matsumoto (Chief Scientist) for providing CTD and water analysis data. We thank Dr J. Zhang, Dr J. Zheng and Dr M. Kusakabe for their valuable suggestions during this study. We also would like to thank the anonymous reviewer for her/his constructive comments. Z.-L. Wang also acknowledges financial aid from the Japan Society for the Promotion of Science. This work was supported partly by the Special Coordination Funds for Promoting Science and Technology (GCMAPS) by the Ministry of Education, Culture, Sports, Science and Technology, Japan.
- Duce RA, Liss PS, Merrill JT, Atlas EL, BuatMénard P, Hicks BB, Miller JM, Prospero JM, Arimoto R, Church TM, Ellis W, Galloway JN, Hansen L, Jickells TD, Knap AH, Reinhardt KH, Schneider B, Soudine A, Tokos JJ, Tsunogai S, Wollast R, Zhou M (1991) The atmospheric input of trace species to the world ocean. Global Biogeochem Cycles 5:193–259CrossRefGoogle Scholar
- Matsumoto K (Ed. in chief) (2003) Preliminary cruise report of MR02–K06 (leg 3)Google Scholar
- Tazoe H, Obata H, Gamo T (2006) Marine geochemistry of cerium and neodymium isotopic compositions in the Western North Pacific Ocean. In: Abstract for the Western Pacific Geophysics Meeting, Beijing, China, July 24–27, 2006: B41A-0053Google Scholar
- Zhang J (1995) The geochemistry of yttrium and lanthanides in seawater. PhD thesis, University of TokyoGoogle Scholar