Deciphering the Biophysical Impact of Permafrost Greening on Summer Surface Offset
文献类型：期刊论文
| 作者 | Wang, Jian2,3; Liu, Desheng1 |
| 刊名 | EARTHS FUTURE
 |
| 出版日期 | 2024-06-01 |
| 卷号 | 12期号:6页码:e2023EF004077 |
| 关键词 | permafrost greening summer surface offset evapotranspiration surface albedo soil moisture thermal dynamics |
| DOI | 10.1029/2023EF004077 |
| 产权排序 | 1 |
| 文献子类 | Article |
| 英文摘要 | Satellite observations have shown widespread greening during the last few decades over the northern permafrost region, but the impact of vegetation greening on permafrost thermal dynamics remains poorly understood, hindering the understanding of permafrost-vegetation-climate feedbacks. Summer surface offset (SSO), defined as the difference between surface soil temperature and near-surface air temperature in summer (June-August), is often predicted as a function of surface thermal characteristics for permafrost modeling. Here we examined the impact of leaf area index (LAI), detected by satellite as a proxy to permafrost vegetation dynamics, on SSO variations from 2003 to 2021 across the northern permafrost region. We observed latitude- and biome-dependent patterns of SSO changes, with a pronounced increase in Siberian shrublands and a decrease in Tibetan grasslands. Based on partial correlation and sensitivity analyses, we found a strong LAI signal (similar to 30% of climatic signal) on SSO with varying elevation- and canopy height-dependent patterns. Positive correlations or sensitivities, that is, increases in LAI lead to higher SSO, were distributed in relatively cold and wet areas. Biophysical effects of permafrost greening on surface albedo, evapotranspiration, and soil moisture (SM) could link the connection between LAI and SSO. Increased LAI substantially reduced surface albedo and enhanced evapotranspiration, influenced energy redistribution, and further controlled interannual variability of SSO. We also found contrasting effects of LAI on surface SM, consequently leading to divergent impacts on SSO. The results offer a fresh perspective on how greening affects the thermal balance and dynamics of permafrost, which is enlightening for improved permafrost projections. Climate change has caused substantial vegetation growth that was detected by satellite observations (greening) over northern permafrost regions. However, the consequences or feedbacks of vegetation greening remain largely unknown, hindering the understanding of near-surface thermal dynamics and bringing considerable uncertainty in model projections. Here we aimed to decipher the biophysical impact of permafrost greening on the summer surface offset (SSO), which is an indicator of permafrost degradation. We found latitude- and biome-dependent patterns of SSO changes and divergent responses of SSO to greening. Increases in satellite-observed leaf area index lead to higher SSO in relatively cold and wet areas but lower SSO in warm-dry regions. Biophysical mechanisms associated with surface albedo, evapotranspiration, and SM can help explain various effects of greening on SSO. Our results highlight greening feedbacks on the thermal dynamics of permafrost with climate warming, calling for the improvement of current projections. Vegetation greening impacts the thermal dynamics of permafrost surface Biophysical effects of greening on surface offset could be related to surface albedo, evapotranspiration, and soil moisture |
| WOS关键词 | CLIMATE ; EVAPORATION ; EQUATION ; EARTH |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences |
| WOS记录号 | WOS:001241538700001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/205334]  |
| 专题 | 陆地表层格局与模拟院重点实验室_外文论文 |
| 通讯作者 | Liu, Desheng |
| 作者单位 | 1.Ohio State Univ, Dept Geog, Columbus, OH 43210 USA 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Jian,Liu, Desheng. Deciphering the Biophysical Impact of Permafrost Greening on Summer Surface Offset[J]. EARTHS FUTURE,2024,12(6):e2023EF004077. |
| APA | Wang, Jian,&Liu, Desheng.(2024).Deciphering the Biophysical Impact of Permafrost Greening on Summer Surface Offset.EARTHS FUTURE,12(6),e2023EF004077. |
| MLA | Wang, Jian,et al."Deciphering the Biophysical Impact of Permafrost Greening on Summer Surface Offset".EARTHS FUTURE 12.6(2024):e2023EF004077. |
入库方式： OAI收割
来源：地理科学与资源研究所
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