Page 54 - 《高原气象》2025年第5期
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                     Spatiotemporal Variation Characteristics of Freezing and Thawing

                         Parameters in Permafrost over the Qinghai-Xizang (Tibetan)
                                       Plateau and Their Influencing Factors



                          LI Boyuan , LAI Xin , LIU Kang , HE Peihong , ZHANG Haoran , ZHANG Ge 1
                                                                    1
                                                                                    1
                                                       2
                                   1
                                             1
                 (1. School of Atmospheric Sciences, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu Plain Urban
                  Meteorology and Environment Observation and Research Station of Sichuan Province, Sichuan Meteorological Disaster Prediction and
                     Early Warning Engineering Laborato, Chengdu University of Information Technology, Chengdu  610225, Sichuan, China;
                              2. Suining Branch of Civil Aviation Flight Academy of China, Suining  629000, Sichuan, China)
             Abstract: The freeze-thaw cycle of near-surface soil in the perennial permafrost region of the Qinghai-Xizang
             (Tibetan) Plateau plays a crucial role in regulating water and energy exchange between the soil and the atmo‐
             sphere. Investigating its spatiotemporal characteristics and response to climate change is essential for understand‐
             ing the mechanisms driving climate change on the plateau. In this study, we calculated near-surface freeze-thaw
             parameters-including the start and end times of soil freezing, thawing duration, and freezing duration-across the
             perennial permafrost region of the plateau from 1980 to 2017 using the Common Land Model 5. 0 (CLM5. 0).
             We  further  analyzed  their  spatiotemporal  variations  and  correlations  with  temperature,  precipitation,  snow
             depth, and vegetation index. The results show that: (1) The onset of near-surface soil freezing in the plateau’s
             permafrost region occurs between September and mid-to-late October, while the thawing period ends between
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