| Response of Freezing/Thawing Indexes to the Wetting Trend under Warming Climate Conditions over the Qinghai–Tibetan Plateau during 1961–2010: A Numerical Simulation |
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| 作者姓名： | Xuewei FANG Zhi LI Chen CHENG Klaus FRAEDRICH Anqi WANG Yihui CHEN Yige XU Shihua LYU |
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| 作者单位： | 1. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences,Chengdu University of Information Technology;2. Southwest Institute of Technical Physics;3. Max Planck Institute for Meteorology;4. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science & Technology |
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| 摘 要： | Since the 1990s, the Qinghai–Tibetan Plateau(QTP) has experienced a strikingly warming and wetter climate that alters the thermal and hydrological properties of frozen ground. A positive correlation between the warming and thermal degradation in permafrost or seasonally frozen ground(SFG) has long been recognized. Still, a predictive relationship between historical wetting under warming climate conditions and frozen ground has not yet been well demonstrated,despite the expectation that it will b...
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| 关 键 词： | freezing/thawing indexes numerical modeling wetting process frozen ground Qinghai–Tibetan Plateau |
Response of Freezing/Thawing Indexes to the Wetting Trend under Warming Climate Conditions over the Qinghai –Tibetan Plateau during 1961–2010: A Numerical Simulation |
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| Xuewei FANG,Zhi LI,Chen CHENG,Klaus FRAEDRICH,Anqi WANG,Yihui CHEN,Yige XU,Shihua LYU.Response of Freezing/Thawing Indexes to the Wetting Trend under Warming Climate Conditions over the Qinghai –Tibetan Plateau during 1961–2010: A Numerical Simulation[J].Advances in Atmospheric Sciences,2023,40(2):211-222. |
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| Authors: | Xuewei FANG Zhi LI Chen CHENG Klaus FRAEDRICH Anqi WANG Yihui CHEN Yige XU Shihua LYU |
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| Abstract: | Since the 1990s, the Qinghai–Tibetan Plateau (QTP) has experienced a strikingly warming and wetter climate that alters the thermal and hydrological properties of frozen ground. A positive correlation between the warming and thermal degradation in permafrost or seasonally frozen ground (SFG) has long been recognized. Still, a predictive relationship between historical wetting under warming climate conditions and frozen ground has not yet been well demonstrated, despite the expectation that it will become even more important because precipitation over the QTP has been projected to increase continuously in the near future. This study investigates the response of the thermal regime to historical wetting in both permafrost and SFG areas and examines their relationships separately using the Community Land Surface Model version 4.5. Results show that wetting before the 1990s across the QTP mainly cooled the permafrost body in the arid and semiarid zones, with significant correlation coefficients of 0.60 and 0.48, respectively. Precipitation increased continually at the rate of 6.16 mm decade–1 in the arid zone after the 1990s but had a contrasting warming effect on permafrost through a significant shortening of the thawing duration within the active layer. However, diminished rainfall in the humid zone after the 1990s also significantly extended the thawing duration of SFG. The relationship between the ground thawing index and precipitation was significantly negatively correlated (?0.75). The dual effects of wetting on the thermal dynamics of the QTP are becoming critical because of the projected increases in future precipitation. |
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| Keywords: | freezing/thawing indexes numerical modeling wetting process frozen ground Qinghai–Tibetan Plateau |
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