| DOI: | 10.1038/ngeo2633
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| 论文题名: | Enhanced Southern Ocean marine productivity due to fertilization by giant icebergs |
| 作者: | Duprat L.P.A.M.; Bigg G.R.; Wilton D.J.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2016
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| 卷: | 9, 期:3 | | 起始页码: | 219
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| 结束页码: | 221
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| 语种: | 英语
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| Scopus关键词: | carbon flux
; chlorophyll
; iceberg calving
; image analysis
; marine ecosystem
; nutrient availability
; ocean color
; open ocean
; primary production
; satellite imagery
; trace element
; Southern Ocean
; Weddell Sea
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| 英文摘要: | Primary productivity is enhanced within a few kilometres of icebergs in the Weddell Sea owing to the input of terrigeneous nutrients and trace elements during iceberg melting. However, the influence of giant icebergs, over 18 km in length, on marine primary production in the Southern Ocean is less well studied. Here we present an analysis of 175 satellite images of open ocean colour before and after the passage of 17 giant icebergs between 2003 and 2013. We detect substantially enhanced chlorophyll levels, typically over a radius of at least 4-10 times the iceberg's length, that can persist for more than a month following passage of a giant iceberg. This area of influence is more than an order of magnitude larger than that found for sub-kilometre scale icebergs or in ship-based surveys of giant icebergs. Assuming that carbon export increases by a factor of 5-10 over the area of influence, we estimate that up to a fifth of the Southern Ocean's downward carbon flux originates with giant iceberg fertilization. We suggest that, if giant iceberg calving increases this century as expected, this negative feedback on the carbon cycle may become more important. © 2016 Macmillan Publishers Limited. All rights reserved. |
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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/106049
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Department of Geography, University of Sheffield, Sheffield, United Kingdom
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| Recommended Citation: | |
Duprat L.P.A.M.,Bigg G.R.,Wilton D.J.. Enhanced Southern Ocean marine productivity due to fertilization by giant icebergs[J]. Nature Geoscience,2016-01-01,9(3)
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