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- GC51G-0272: Hydroclimatic Variability and ITCZ Migration Over the Last Millennium Inferred from a New Speleothem Record in Northern Colombia using paleo data assimilation
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Board 0272‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Derick Appiah Kubi, SUNY Albany (First Author, Presenting Author)
Zhiqiang Lyu, SUNY Albany
Veronica Ramirez, USP University of Sao Paulo
Francisco Cruz, Universidade de São Paulo
Haiwei Zhang, Institute of Global Environmental Change,Xi’an Jiaotong University
Hai Cheng, Institute of Global Environmental Change, Xi’an Jiaotong University
R. Lawrence Edwards, Nanjing Normal University
Mathias Vuille, University at Albany, State University of New York
The Intertropical Convergence Zone (ITCZ) is a key driver of rainfall in tropical South America. Its north-south movement strongly affects regional climate, but we still do not fully understand how it has changed over the past thousand years. In this study, we use a new high-resolution climate record from a Colombian cave to track past changes in rainfall. This record comes from speleothems (cave deposits) that capture variations in oxygen isotopes linked to precipitation.We compare this new record with other climate data and models that combine past observations with simulations. By looking at wet and dry periods over centuries, we find that shifts in rainfall across the tropics are connected to the ITCZ moving north or south. Our results show that during cooler periods like the Little Ice Age, the ITCZ moved southward, bringing more rain to parts of South America.
This study highlights the importance of collecting high-quality climate records from underrepresented areas like Colombia. It also shows that combining real-world data with advanced climate models can help us better understand long-term changes in tropical rainfall patterns and the movement of the ITCZ.
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