| DOI: | 10.1038/ngeo2654
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| 论文题名: | Large contribution to inland water CO2 and CH4 emissions from very small ponds |
| 作者: | Holgerson M.A.; Raymond P.A.
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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: | 222
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| 结束页码: | 226
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| 语种: | 英语
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| Scopus关键词: | atmospheric plume
; carbon dioxide
; carbon flux
; concentration (composition)
; gas exchange
; greenhouse gas
; lacustrine deposit
; lacustrine environment
; methane
; oxidation
; pond
; shallow water
; supersaturation
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| 英文摘要: | Inland waters are an important component of the global carbon cycle. Although they contribute to greenhouse gas emissions, estimates of carbon processing in these waters are uncertain. The global extent of very small ponds, with surface areas of less than 0.001 km2, is particularly difficult to map, resulting in their exclusion from greenhouse gas budget estimates. Here we combine estimates of the lake and pond global size distribution, gas exchange rates, and measurements of carbon dioxide and methane concentrations from 427 lakes and ponds ranging in surface area from 2.5 m2 to 674 km2. We estimate that non-running inland waters release 0.583 Pg C yr-1. Very small ponds comprise 8.6% of lakes and ponds by area globally, but account for 15.1% of CO2 emissions and 40.6% of diffusive CH4 emissions. In terms of CO2 equivalence, the ratio of CO2 to CH4 flux increases with surface area, from about 1.5 in very small ponds to about 19 in large lakes. The high fluxes from very small ponds probably result from shallow waters, high sediment and edge to water volume ratios, and frequent mixing. These attributes increase CO2 and CH4 supersaturation in the water and limit efficient methane oxidation. We conclude that very small ponds represent an important inland water carbon flux. © 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/106053
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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: | School of Forestry and Environmental Studies, Yale University, New Haven, CT, United States
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| Recommended Citation: | |
Holgerson M.A.,Raymond P.A.. Large contribution to inland water CO2 and CH4 emissions from very small ponds[J]. Nature Geoscience,2016-01-01,9(3)
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