| Autor: |
Isela Leonor Vásquez P., Humberto Alves Barbosa, Gilvan Sampaio, César Arturo Sánchez P., Giselle Utida, David Pareja Quispe, Juan Gregorio Rejas Ayuga, Hugo Abi Karam, Jelena Maksic, Marília Harami Shimizu, Francisco William Cruz |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Zdroj: |
eISSN |
| Popis: |
Decadal and multidecadal variability of the Intertropical Convergence Zone (ITCZ) is analyzed in space-time using CMIP6 simulations and paleoprecipitation records during the Last Millennium. We investigated the persistence patterns of the CMIP6 ensemble models, using low frequency component analysis (LFCA) to isolate the mechanisms that modulate the ITCZ at the multidecadal scale. The results suggest that the north-south displacement of the ITCZ was related to the oceanic region with the highest sea surface temperature (SST) of the tropical South Atlantic basin. The zonal mode variability is initially associated with the equatorial region (between 5° S and 5° N) and with the northwestern African coast. These observations also contrast with the paleoclimatic records of the region, indicating a northward shift of the ITCZ during the MCA and a southward shift during the LIA. Based on the periodicities observed the 21 years is predominant during the Last Millennium can be associated with the solar cycle influence on the pattern of ITCZ contracted and positioned in the central region of the equator. This relationship suggests that, although ENSO is the main driver in variability over Tropical South America at interannual time scales, this influence can be significantly modulated by longer time scales. The results suggest the existence of a low-frequency variability, modifying the distribution of precipitation and with consequences in the intensity and frequency of droughts/floods events in the NE, indicating that these events are associated with the coupling between the oceans and the atmosphere. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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