An Intertropical Convergence Zone shift controlled the terrestrial material supply on the Ninetyeast Ridge

• DOI: 10.5194/cp-18-1369-2022
• Publication Date: 2022-06-22T13:20:58Z
• Authors: Xudong Xu; Jianguo Liu; Yun Huang; Lanlan Zhang; Liang Yi; Shengfa Liu; Yiping Yang; Li Cao; Long Tan
• Keywords: Intertropical Convergence Zone; Paleoclimatology; Convergence zone

Abstract. Among various climate drivers, direct evidence for the Intertropical Convergence Zone (ITCZ) control of sediment supply on millennial scale is lacking, and changes in ITCZ migration demonstrated paleoclimate records need to be better investigated. Here, we use clay minerals Sr–Nd isotopes obtained from a gravity core Ninetyeast Ridge track corresponding source variations analyze relationship between terrestrial material climatic changes. On glacial–interglacial scale, chemical weathering weakened during North Atlantic cold-climate periods falling sea level hindered transport smectite into study area due exposure Andaman Nicobar Islands. However, influence South Asian monsoon was not obvious scale. We suggest that north–south controlled rainfall Myanmar further directly determined millennium because highly connected with location; thus, regional shift induced an abnormal increase percentage late Last Glacial Maximum (LGM) our records. The studied similar distinct but different some periods, revealing were significantly obvious, simple displacement, closer connections occurred Northern–Southern Hemisphere eastern Indian Ocean LGM.