Tibetan Plateau Temperature Extreme Changes and Their Elevation Dependency From Ground‐Based Observations
Tibetan Plateau Temperature Extreme Changes and Their Elevation Dependency From Ground‐Based Observations
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DOI：
10.1029/2021jd035734
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Keke Yang;Donglin Guo;Wei Hua;N. Pepin;Kun Yang;Duo Li
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文献类型：
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作者：
Keke Yang;Donglin Guo;Wei Hua;N. Pepin;Kun Yang;Duo Li
极端温度对青藏高原固体水库的维持具有广泛的意义，但其变化的时空格局和海拔依赖性还没有得到很好的理解。利用124个站点的观测数据，这项研究表明，在1973-2018年期间，TP作为一个整体经历了极端温暖的强度/频率增加（0.37°C decade−1/2.4% decade−1）和极端寒冷的强度/频率降低（0.59°C decade−1/2.4% decade−1），并且这些变化随着区域平均变暖的加剧而加强。与极端高温不同，极端低温的趋势强烈依赖于海拔，这种海拔依赖性的时间演变主要是由区域平均变暖引起的高海拔地区的积雪迅速减少。区域平均变暖越强，极端低温趋势的高度依赖性越显著。这些结果表明，TP极端温度变化，特别是在高海拔地区，将变得更加显著，在温暖的未来，这对生态系统依赖于高海拔水资源具有重要意义。
Temperature extremes have widespread implications for maintenance of the solid water reservoir on the Tibetan Plateau (TP), but their changing spatiotemporal patterns and elevation dependence have not been well understood. Using observations at 124 stations, this study shows that the TP as a whole has experienced increasing intensities/frequencies of warm extremes (0.37°C decade−1/2.4% decade−1) and decreasing intensities/frequencies of cold extremes (0.59°C decade−1/2.4% decade−1) during 1973–2018, and that these changes strengthen as regional mean warming intensifies. Unlike extreme high temperature, trends in extreme low temperature depend strongly on elevation, and the temporal evolution of such elevation‐dependency is dominated by rapid snow decline in high altitudes caused by regional mean warming. The stronger regional mean warming, the more significant elevation dependency of trends in extreme low temperatures. These results indicate that TP extreme temperature changes, especially at higher elevations, will become more significant in a warmer future, which has important implications for the ecosystems dependent on high‐elevation water resources.