青藏高原冰川气象与能量平衡研究进展

Review of Research on Observed Meteorology and Energy Balance in Glaciated Regions of the Tibetan Plateau

  • 摘要: 青藏高原的冰川处于快速退缩中,对中下游地区的水资源供给和生态环境具有重要影响。雪冰下垫面具有高辐射、高水汽、高风速及气象要素变化剧烈等特点,是高原气象研究不可或缺的重要组成,然而受限于高海拔极端环境,青藏高原及周边仅有22条冰川发布了气象监测结果,其中在19条冰川上开展了冰川-大气间能量和物质交换研究;冰川气象监测稀疏且连续性不强,制约了冰川对气候变化响应的机理研究。文章搜集已发表的青藏高原冰川区气象观测资料,从冰川气象变量时空特征、变化规律,以及冰川表面与大气间的能量物质交换特征进行了梳理和综述。现有消融期能量平衡研究表明,净辐射为青藏高原冰川主要的能量来源,平均占比为79%;消融潜热为主要的能量支出,平均为59%,其次为蒸发/升华潜热支出,平均为32%。由于受限于数据序列长度和观测期的差异,目前仍难以综合客观地揭示青藏高原冰川气象及能量平衡时空特征。未来,仍需加强现有冰川气象监测网络建设、发展遥感数据同化技术以及开展青藏高原不同区域典型冰川同期能量平衡对比观测研究,以期更好地理解青藏高原冰川能量平衡及其对气候变化的响应机制。

     

    Abstract: The rapid retreatment of glaciers in the Tibetan Plateau has significant implications for water supply and ecological environment in the areas downstream. The snow and ice surface is characterized by large radiation and water vapor, strong wind speed, and significant variability, making it an essential component of plateau meteorology. However, due to the complex terrain and harsh climate, existing glacier meteorological monitoring is very sparse and lacks continuity, which limits our understanding of glacier meteorological change mechanisms, glacier energy exchange, and its hydrological impacts. This paper collects published meteorological observational data and scientific knowledge for glacier regions of the Tibetan Plateau, and organizes the findings based on variation patterns and spatial-temporal characteristics of glacier meteorological variables. Monitoring results over a total of 23 glaciers in the Tibetan Plateau and its surrounding areas have been released, glacier energy balance studies have been conducted at 20 glaciers. Existing energy balance studies have shown that net radiation is the primary energy source for glaciers in the Tibetan Plateau, accounting for an average of 75%. Ablation heat is the primary energy expenditure that accounts for an average of 60%, followed by evaporation/sublimation heat expenditure, which accounts for an average of 32%. However, due to limitations in the length of the data sequences and different periods, it is still difficult to comprehensively and objectively reveal spatiotemporal characteristics of glacier meteorology and energy balance in the Tibetan Plateau. In the future, it is necessary to strengthen the existing meteorological monitoring network, develop remote sensing data assimilation techniques, and conduct synchronous energy balance studies over typical glaciers in different regions of the Tibetan Plateau to better understand glacier energy balance and its response mechanism to climate change.

     

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