| DOI: | 10.2172/1224739
|
| 报告号: | DOE-Purdue--SC0007007-1
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| 报告题名: | DOE Final Report on Collaborative Research. Quantifying Climate Feedbacks of the Terrestrial Biosphere under Thawing Permafrost Conditions in the Arctic |
| 作者: | Zhuang, Qianlai; Schlosser, C. Adam; Melillo, Jerry M.; Anthony, Katey Walter; Kicklighter, David; Gao, Xiang
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| 出版年: | 2015
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| 发表日期: | 2015-11-03
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| 总页数: | 18
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Permafrost
; climate
; methane
; carbon
; earth system model
; biogeochemistry
|
| 中文主题词: | 生物圈
; 碳
; 永久冻土
; 排放物
; 蒸散
; 湖泊
; 湿地
; 剥蚀
; 景观
; 二氧化碳
; 甲烷
|
| 主题词: | BIOSPHERE
; CARBON
; PERMAFROST
; EMISSIONS
; EVAPOTRANSPIRATION
; LAKES
; WETLANDS
; DEGRADATION
; LANDSCAPE
; CARBON DIOXIDE
; METHANE
|
| 英文摘要: | Our overall goal is to quantify the potential for threshold changes in natural emission rates of trace gases, particularly methane and carbon dioxide, from pan-arctic terrestrial systems under the spectrum of anthropogenically-forced climate warming, and the conditions under which these emissions provide a strong feedback mechanism to global climate warming. This goal is motivated under the premise that polar amplification of global climate warming will induce widespread thaw and degradation of the permafrost, and would thus cause substantial changes to the landscape of wetlands and lakes, especially thermokarst (thaw) lakes, across the Arctic. Through a suite of numerical experiments that encapsulate the fundamental processes governing methane emissions and carbon exchanges â as well as their coupling to the global climate system - we intend to test the following hypothesis in the proposed research: There exists a climate warming threshold beyond which permafrost degradation becomes widespread and stimulates large increases in methane emissions (via thermokarst lakes and poorly-drained wetland areas upon thawing permafrost along with microbial metabolic responses to higher temperatures) and increases in carbon dioxide emissions from well-drained areas. Besides changes in biogeochemistry, this threshold will also influence global energy dynamics through effects on surface albedo, evapotranspiration and water vapor. These changes would outweigh any increased uptake of carbon (e.g. from peatlands and higher plant photosynthesis) and would result in a strong, positive feedback to global climate warming. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1224739
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/41715
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| File Name/ File Size |
Content Type |
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| 1224739.docx（1009KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Zhuang, Qianlai,Schlosser, C. Adam,Melillo, Jerry M.,et al. DOE Final Report on Collaborative Research. Quantifying Climate Feedbacks of the Terrestrial Biosphere under Thawing Permafrost Conditions in the Arctic. 2015-01-01.
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