| DOI: | 10.1016/j.marpolbul.2017.09.056
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| Scopus记录号: | 2-s2.0-85030478682
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| 论文题名: | Mercury in dated sediment cores from coastal ponds of St Thomas, USVI |
| 作者: | Benoit G.
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| 刊名: | Marine Pollution Bulletin
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| ISSN: | 0025-326X
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| EISSN: | 1879-3363
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| 出版年: | 2017
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| 语种: | 英语
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| 英文关键词: | 210Pb
; Caribbean
; Mercury
; Sediments
; Virgin Islands
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| Scopus关键词: | Deposition
; Lakes
; Mercury (metal)
; Ponds
; Watersheds
; Caribbean
; Constant level
; Direct deposition
; Mercury levels
; Sediment accumulation
; Sediment core
; Virgin islands
; ^210Pb
; Sediments
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| Scopus学科分类: | Agricultural and Biological Sciences: Aquatic Science
; Earth and Planetary Sciences: Oceanography
; Environmental Science: Pollution
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| 英文摘要: | We collected seven cores from five coastal ponds in St Thomas, USVI, dated them via 210Pb, and measured their Hg profiles. Levels ranged from 20 to 100ngg-1 and always increased upward to the surface or a shallow mixed zone. Taking into account differences in sediment accumulation rates and the presence or absence of a mixed zone, all sites revealed similar deposition histories. Mercury levels were at low, possibly pristine, values until the early to mid-20th century. Then they then doubled or quadrupled steadily until about 1990, after which Hg became relatively constant. We conclude that Hg in the sediments of these ponds came from long range deposition directly to the ponds and to their watersheds. Constant levels in recent years may be caused by transfer from watersheds, a pathway that is delayed compared to direct deposition from the atmosphere. © 2017 Elsevier Ltd. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/88080
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| Appears in Collections: | 过去全球变化的重建
全球变化的国际研究计划
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作者单位: | Yale Environment School, 195 Prospect Street, New Haven, CT 06511
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| Recommended Citation: | |
Benoit G.. Mercury in dated sediment cores from coastal ponds of St Thomas, USVI[J]. Marine Pollution Bulletin,2017-01-01
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