Detecting the spatial-temporal pattern of moisture evolution on the Tibetan Plateau during the Holocene by model-proxy comparison

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Zeyu Zheng, Liya Jin, Jinjian Li, Xiaojian Zhang, Jie Chen
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Abstract

The Tibetan Plateau (TP) is a key region for environmental and climatic research due to its significant linkages with large-scale atmospheric circulation. Understanding the long-term moisture evolution pattern and its forcing mechanisms on the TP during the Holocene may provide insights into the interaction between low-latitude climate systems and midlatitude westerlies. Here, we synthesized 27 paleoclimate proxy records covering the past 9500 years. The results of the rotated empirical orthogonal function analysis of the moisture variation revealed spatial-temporal heterogeneity, which was classified into 5 subregions. Proxy records were then compared with the results from the Kiel Climate Model and other paleorecords. The results showed that moisture evolution on the western-southern-central TP was controlled by the Indian summer monsoon (ISM). On the south-eastern TP, moisture change was affected by the interplay between the East Asian summer monsoon (EASM) and the westerlies, as well as the ISM. With diverse patterns of circulation system precipitation, moisture changes recorded in the paleorecords showed spatial-temporal discrepancies, especially during the early to middle Holocene. Moreover, given the anti-phase pattern of summer precipitation in the EASM area under El Niño/Southern Oscillation (ENSO) conditions and the unstable relationship between the ISM and ENSO, it is reasonable to conclude that relatively strong ENSO variability during the late Holocene has contributed to these discrepancies as Asian summer monsoon precipitation has declined.

通过模式-实证对比探测全新世青藏高原水汽演变的时空格局
青藏高原与大尺度大气环流有着重要的联系,是环境和气候研究的关键地区。了解全新世青藏高原的长期水汽演变模式及其强迫机制,有助于深入了解低纬度气候系统与中纬度西风之间的相互作用。在此,我们综合了过去 9500 年的 27 条古气候代用记录。水汽变化的旋转经验正交函数分析结果显示了时空异质性,并将其划分为 5 个亚区域。然后将代理记录与基尔气候模型和其他古记录的结果进行了比较。结果表明,中西部-南部热带潮湿带的水汽演变受印度夏季季风(ISM)控制。在东南大陆架,水汽变化受到东亚夏季季候风和西风以及印度夏季季候风之间相互作用的影响。由于环流系统降水模式的多样性,古记录中记录的水汽变化呈现出时空差异,尤其是在全新世早中期。此外,考虑到在厄尔尼诺/南方涛动(ENSO)条件下 EASM 地区夏季降水的反相模式以及 ISM 与 ENSO 之间的不稳定关系,可以合理地得出结论:随着亚洲夏季季风降水量的减少,全新世晚期相对较强的 ENSO 变异是造成这些差异的原因之一。
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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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