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| DOI | 10.1038/s41561-022-00979-2 |
| Permafrost cooled in winter by thermal bridging through snow-covered shrub branches | |
| Domine F.; Fourteau K.; Picard G.; Lackner G.; Sarrazin D.; Poirier M. | |
| 发表日期 | 2022 |
| ISSN | 1752-0894 |
| 起始页码 | 554 |
| 结束页码 | 560 |
| 卷号 | 15期号:7 |
| 英文摘要 | Considerable expansion of shrubs across the Arctic tundra has been observed in recent decades. These shrubs are thought to have a warming effect on permafrost by increasing snowpack thermal insulation, thereby limiting winter cooling and accelerating thaw. Here, we use ground temperature observations and heat transfer simulations to show that low shrubs can actually cool the ground in winter by providing a thermal bridge through the snowpack. Observations from unmanipulated herb tundra and shrub tundra sites on Bylot Island in the Canadian high Arctic reveal a 1.21 °C cooling effect between November and February. This is despite a snowpack that is twice as insulating in shrubs. The thermal bridging effect is reversed in spring when shrub branches absorb solar radiation and transfer heat to the ground. The overall thermal effect is likely to depend on snow and shrub characteristics and terrain aspect. The inclusion of these thermal bridging processes into climate models may have an important impact on projected greenhouse gas emissions by permafrost. © 2022, The Author(s). |
| 语种 | 英语 |
| scopus关键词 | cooling; insulation; permafrost; shrub; thawing; Arctic; Bylot Island; Canada; Nunavut |
| 来源期刊 | Nature Geoscience
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/262168 |
| 作者单位 | Takuvik Joint International Laboratory, Université Laval (Canada) and CNRS-INSU (France), Québec, Canada |
| 推荐引用方式 GB/T 7714 | Domine F.； Fourteau K.； Picard G.； Lackner G.； Sarrazin D.； Poirier M.. Permafrost cooled in winter by thermal bridging through snow-covered shrub branches[J],2022,15(7). |
| APA | Domine F.； Fourteau K.； Picard G.； Lackner G.； Sarrazin D.； Poirier M..(2022).Permafrost cooled in winter by thermal bridging through snow-covered shrub branches.Nature Geoscience,15(7). |
| MLA | Domine F.； Fourteau K.； Picard G.； Lackner G.； Sarrazin D.； Poirier M.."Permafrost cooled in winter by thermal bridging through snow-covered shrub branches".Nature Geoscience 15.7(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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