1980-2020 年青藏高原冻土活动层的变化

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
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引用次数: 0

摘要

活动层是冻土与大气之间水热交换的中介,对冻土地区的生物地球化学循环有很大影响,对气候波动非常敏感。本研究利用中国气象强迫数据集驱动共同体陆地模式 5.0 版,模拟了 1980-2020 年青藏高原活动层厚度(ALT)的时空特征。结果表明,2000 年以后,主要在青藏高原中西部观测站观测不足的地方,青藏高原活动层厚度呈现出显著的年代际变化。大陆坡的平均厚度从 1980-1999 年的 2.54 米下降到 2000-2020 年的 2.28 米。这种变化主要出现在西部永久冻土区,与东部地区相比,显示出明显的区域不一致性。在东部永久冻土区,ALT 呈持续上升趋势,而不是年代际变化。上述 ALT 的变化与周围大气环境,特别是气温的变化密切相关。此外,由于永久冻土的融化和形成,TP 上的活动层面积在 2000 年前后出现了深刻的年代际变化。2000 年之前,活动层面积持续减少,但 2000 年之后几乎没有变化。本研究揭示的 TP 上永久冻土活动层的区域变化表明了全球变暖下当代气候的复杂响应。摘要活动层是多年冻土和大气之间的缓冲层, 对气候波动十分敏感, 其冻融变化对多年冻土区的地球生物化学循环有较大影响。本研究利用高分辨率气象数据集cmfd和陆面过程模式clm5.0模拟分析了青藏高原1980-2020年活动层的变化。结果表明: 青藏高原的活动层厚度在 2000 年后有显著的年代际变化, 青藏高原整体活动层厚度由 1980-999 的 2.54 m 减少到 2000--2020 年的 2.28 m. 这种变化主要发生在西部的多年冻土区, 与东部相比存在明显的区域差异。在东部,多年冻土区的活动层厚度呈持续增加趋势,而不是年代际变化。此外,活动层面积在 2000 年也发生了年代际突变,之前持续下降,但之后几乎没有变化。本文还发现青藏高原多年冻土活动层的区域变化受到气温和降水等环境因子的显著影响, 这反映了其在全球变暖背景下对气候变化的复杂响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Variation in the permafrost active layer over the Tibetan Plateau during 1980–2020

Variation in the permafrost active layer over the Tibetan Plateau during 1980–2020

The active layer, acting as an intermediary of water and heat exchange between permafrost and atmosphere, greatly influences biogeochemical cycles in permafrost areas and is notably sensitive to climate fluctuations. Utilizing the Chinese Meteorological Forcing Dataset to drive the Community Land Model, version 5.0, this study simulates the spatial and temporal characteristics of active layer thickness (ALT) on the Tibetan Plateau (TP) from 1980 to 2020. Results show that the ALT, primarily observed in the central and western parts of the TP where there are insufficient station observations, exhibits significant interdecadal changes after 2000. The average thickness on the TP decreases from 2.54 m during 1980–1999 to 2.28 m during 2000–2020. This change is mainly observed in the western permafrost region, displaying a sharp regional inconsistency compared to the eastern region. A persistent increasing trend of ALT is found in the eastern permafrost region, rather than an interdecadal change. The aforementioned changes in ALT are closely tied to the variations in the surrounding atmospheric environment, particularly air temperature. Additionally, the area of the active layer on the TP displays a profound interdecadal change around 2000, arising from the permafrost thawing and forming. It consistently decreases before 2000 but barely changes after 2000. The regional variation in the permafrost active layer over the TP revealed in this study indicates a complex response of the contemporary climate under global warming.

摘要

活动层是多年冻土和大气之间的缓冲层, 对气候波动十分敏感, 其冻融变化对多年冻土区的地球生物化学循环有较大影响. 本研究利用高分辨率气象数据集CMFD和陆面过程模式CLM5.0模拟分析了青藏高原1980–2020年活动层的变化. 结果表明: 青藏高原的活动层厚度在2000年后有显著的年代际变化, 青藏高原整体活动层厚度由1980–1999的2.54 m减少到2000–2020年的2.28 m. 这种变化主要发生在西部的多年冻土区, 与东部相比存在明显的区域差异. 在东部, 多年冻土区的活动层厚度呈持续增加趋势, 而不是年代际变化. 此外, 活动层面积在2000年也发生了年代际突变, 之前持续下降, 但之后几乎没有变化. 本文还发现青藏高原多年冻土活动层的区域变化受到气温和降水等环境因子的显著影响, 这反映了其在全球变暖背景下对气候变化的复杂响应.

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来源期刊
Atmospheric and Oceanic Science Letters
Atmospheric and Oceanic Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.20
自引率
8.70%
发文量
925
审稿时长
12 weeks
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