2022 年夏季热浪导致青藏高原中部冻土迅速变暖

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

npj Climate and Atmospheric Science Pub Date : 2024-09-13 DOI:10.1038/s41612-024-00765-4

Xiaofan Zhu, Tonghua Wu, Jie Chen, Xiaodong Wu, Pengling Wang, Defu Zou, Guangyang Yue, Xuchun Yan, Xin Ma, Dong Wang, Peiqing Lou, Amin Wen, Chengpeng Shang, Weiying Liu

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引用次数: 0

摘要

频率和强度不断增加的极端事件正在对冻土环境产生重大影响。利用ERA5-Land再分析数据进行的分析表明，青藏高原中部的冻土区在2022年经历了夏季热浪。2022年，四个活动层站点出现了最大活动层厚度（平均：207.7厘米），比2000-2021年的平均活动层厚度（平均：175.9厘米）高出20%。2022 年观测到的年平均地面温度（MAGT）也是最高的，比前几年的平均值高出 10%。利用 Stefan 模型量化了热浪对活动层季节性解冻深度的贡献率，其范围为 6.6% 至 13.6%，最大贡献率出现在 2022 年。这些发现有助于更好地理解极端事件对活动层和冻土的影响过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Summer heat wave in 2022 led to rapid warming of permafrost in the central Qinghai-Tibet Plateau

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Summer heat wave in 2022 led to rapid warming of permafrost in the central Qinghai-Tibet Plateau

Extreme events with increasing frequency and intensity are significantly affecting the permafrost environment. Analysis using the ERA5-Land reanalysis data revealed that the permafrost region of the central Qinghai-Tibet Plateau (QTP) experienced the summer heat wave in 2022. Four active layer sites experienced maximum active layer thicknesses (ALT) in 2022 (mean: 207.7 cm), which was 20% higher than the mean ALT during 2000–2021 (mean: 175.9 cm). The mean annual ground temperature (MAGT) observed in 2022 was also the highest, exceeding the average of the previous years by 10%. The contribution fraction of heat wave to the seasonal thaw depth of active layer was quantified using Stefan model with ranging from 6.6% to 13.6%, and the maximum contribution fraction occurs in 2022. These findings are helpful to better understand the impact processes of extreme events on the active layer and permafrost.

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.