Interaction between the East Asian summer monsoon and westerlies as shown by tree-ring records

• DOI: 10.5194/cp-20-1687-2024
• Publication Date: 2024-07-29T12:04:48Z
• Authors: Shengchun Xiao; Xiaomei Peng; Quanyan Tian; Aijun Ding; Jiali Xie; Jingrong Su
• Keywords: Westerlies; East Asian Monsoon

Abstract. Atmospheric circulation changes, their driving mechanisms, and interactions are important topics in global change research. Local changes the East Asian summer monsoon (EASM) midlatitude westerlies will inevitably affect climate ecology of arid zone northwestern China. Hence, it is to study these regional changes. While previous studies this area all single-point reconstruction studies, there a lack research on interaction areas mechanisms two major circulations. Dendroclimatology can provide high-resolution, long-term, reliable multi-point proxies for interannual interdecadal change. We chose observe Alxa Plateau using dendrochronological methods. assembled ring-width records Qinghai spruce (Picea crassifolia) mountain regions surrounding Plateau: Helan Mountains, Changling Mountain, Dongda Mountain. The results show that radial growth was indeed affected by westerlies. heterogeneity precipitation climatic wet–dry different primarily influenced between atmospheric systems, each with its own dominant controlling factors. In case both systems play significant role shaping Mountain southern part mainly EASM. Understanding local conditions help us predict