| DOI: | 10.1002/2016GL070206
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| 论文题名: | Substantial overnight reaeration by convective cooling discovered in pond ecosystems |
| 作者: | Holgerson M.A.; Zappa C.J.; Raymond P.A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8773
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| EISSN: | 1944-8504
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| 出版年: | 2016
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| 卷: | 43, 期:15 | | 起始页码: | 8044
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| 结束页码: | 8051
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| 语种: | 英语
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| 英文关键词: | convection
; dissolved oxygen
; ecosystem
; gas exchange
; pond
; reaeration
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| Scopus关键词: | Air
; Cooling
; Ecology
; Ecosystems
; Heat convection
; Lakes
; Oxygen
; Ponding
; Ponds
; Surface waters
; Air-water
; Atmospheric oxygen
; Convective cooling
; Gas exchange
; Oxygen concentrations
; Oxygen dynamics
; Oxygen levels
; Re-aeration
; Dissolved oxygen
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| 英文摘要: | Trends in freshwater dissolved oxygen (DO) reflect whole-ecosystem properties and influence organismal survival and behavior. Here we show that small ponds have unique oxygen dynamics that differ from larger lakes. We discovered that ponds undersaturated in DO experienced substantial increases in oxygen concentration overnight. Nighttime increases in DO occurred on 45% of the nights sampled and resulted in DO saturation increasing 12-fold (22% saturation) on average. Oxygen spikes were likely to occur when ponds became at least 1.8°C warmer than the air and later in the season when oxygen levels were low (<31% saturation) and the air was warm (≥5.8°C). We demonstrate that overnight increases in surface water DO resulted from atmospheric oxygen invasion as opposed to internal production. Convective cooling enhanced turbulence and air-water gas exchange, leading to intense bursts of oxygen invasion during nighttime hours. This mechanism has not been demonstrated before and has important implications for the biogeochemistry of these systems, as well as understanding how organisms survive in hypoxic small ponds. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981320957&doi=10.1002%2f2016GL070206&partnerID=40&md5=1b6d4452e736c27ea4d818a07c6116a8
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| Citation statistics: |
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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/9736
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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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.,Zappa C.J.,Raymond P.A.. Substantial overnight reaeration by convective cooling discovered in pond ecosystems[J]. Geophysical Research Letters,2016-01-01,43(15).
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