Preprints
https://doi.org/10.5194/cp-2023-102
https://doi.org/10.5194/cp-2023-102
09 Jan 2024
 | 09 Jan 2024
Status: this preprint is currently under review for the journal CP.

Interaction between East Asian summer monsoon and west winds as shown by tree-ring records

Shengchun Xiao, Xiaomei Peng, Quanyan Tian, Aijun Ding, Jiali Xie, and Su Jingrong

Abstract. Against the background of changes in global atmospheric circulation, local changes in the East Asian summer monsoon (EASM) and the mid-latitude westerly winds will inevitably affect the climate and ecology of the arid zone of Northwest China. Hence, it is important to study these changes. We chose to observe these changes in the Alxa Plateau using dendrochronological methods. We assembled ring-width records from Qinghai spruce trees growing in the mountain regions surrounding the Alxa Plateau: the Helan Mountains, Changling Mountain, and Dongdashan Mountain. We analyzed these records for changes on interannual and interdecadal scales. Our results show that radial growth was indeed affected by changes in the monsoons and westerlies. The heterogeneity of precipitation and climatic wet-dry changes in different regions is primarily influenced by the interactions between atmospheric circulation systems, each with its own dominant controlling factors. In the case of the Helan Mountains, both of these major atmospheric circulation systems play a significant role in shaping climate changes. Changling Mountain in the southern part of the Alxa Plateau are mainly influenced by the EASM. Dongdashan Mountain is mainly influenced by the westerlies. Understanding these local conditions will help us predict climate changes in Northwest China.

Shengchun Xiao, Xiaomei Peng, Quanyan Tian, Aijun Ding, Jiali Xie, and Su Jingrong

Status: open (until 05 Mar 2024)

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  • RC1: 'Comment on cp-2023-102', Anonymous Referee #1, 17 Jan 2024 reply
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  • RC3: 'Comment on cp-2023-102', Anonymous Referee #3, 12 Feb 2024 reply
Shengchun Xiao, Xiaomei Peng, Quanyan Tian, Aijun Ding, Jiali Xie, and Su Jingrong
Shengchun Xiao, Xiaomei Peng, Quanyan Tian, Aijun Ding, Jiali Xie, and Su Jingrong

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Short summary
Tree-rings of Qinghai spruce are a good record of regional climate change. The influence of the East Asian Summer Monsoon (EASM) and westerlies on regional dry-wet climate changes is characterized by spatio-temporal heterogeneity. The most dramatic interplay between EASM and westerlies is observed in the Helan Mountains. Regional climate changes around Changling Mountains are most influenced by EASM, and around Dongdashan Mountain are most influenced by westerlies.