| Full text | |
| Author(s): Show less - |
Chiessi, C. M.
[1]
;
Mulitza, S.
[2]
;
Taniguchi, N. K.
[3]
;
Prange, M.
[2]
;
Campos, M. C.
[1]
;
Haeggi, C.
[2, 4]
;
Schefuss, E.
[2]
;
Pinho, T. M. L.
[5]
;
Frederichs, T.
[2, 6]
;
Portilho-Ramos, R. C.
[2]
;
Sousa, S. H. M.
[3]
;
Crivellari, S.
[5]
;
Cruz, F. W.
[5]
Total Authors: 13
|
| Affiliation: | [1] Univ Sao Paulo, Sch Arts Sci & Humanities, Sao Paulo - Brazil
[2] Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen - Germany
[3] Univ Sao Paulo, Inst Oceanog, Sao Paulo - Brazil
[4] Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90007 - USA
[5] Univ Sao Paulo, Inst Geosci, Sao Paulo - Brazil
[6] Univ Bremen, Fac Geosci, Bremen - Germany
Total Affiliations: 6
|
| Document type: | Journal article |
| Source: | PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY; v. 36, n. 4 APR 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Modern precipitation over northeastern (NE) South America is strongly controlled by the seasonal meridional migration of the Intertropical Convergence Zone (ITCZ). Ample evidence from the Northern Hemisphere suggests a mid- to late Holocene southward migration of the ITCZ. Such a shift would be expected to increase precipitation over semi-arid northern NE Brazil (Southern Hemisphere). However, the most robust precipitation record from northern NE Brazil shows a drying trend throughout the Holocene. Here, we address this issue presenting a high-temporal resolution reconstruction of precipitation over northern NE Brazil based on data from a marine sediment core, together with analyses of mid- and late Holocene simulations performed with the fully coupled climate model FGOALS-s2. Both, our data and the climate model simulations show a decrease in precipitation over northern NE Brazil from the mid- to the late Holocene. The model outputs further indicate a latitudinal contraction of the seasonal migration range of the ITCZ that, together with an intensification of the regional Walker circulation, were responsible for the mid- to late Holocene changes in precipitation over NE South America. Our results reconcile apparently conflicting precipitation records and climate mechanisms used to explain changes in precipitation over NE South America. (AU) | |
| FAPESP's process: | 18/15123-4 - Past perspectives on tipping elements of the climate system: the Amazon Rainforest and the Atlantic Meridional Overturning Circulation (PPTEAM) |
| Grantee: | Cristiano Mazur Chiessi |
| Support Opportunities: | Research Grants - Research Program on Global Climate Change - Young Investigators - Phase 2 |
| FAPESP's process: | 19/10642-6 - Response of the upper water column at the origin of the Brazil Current to slowdown events of the Atlantic Meridional Ocean Circulation during the last 80 ka |
| Grantee: | Tainã Marcos Lima Pinho |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 18/06790-7 - Variability of the Brazil Current and South American climate during the last glacial cycle: assessing sea-surface temperatures via Mg/Ca analyses and pulses of terrigenous sediments via X-ray fluorescence analyses |
| Grantee: | Marília de Carvalho Campos Garcia |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 19/24349-9 - Assessing the effects of past and future climate change on Amazonian biodiversity (CLAMBIO) |
| Grantee: | Cristiano Mazur Chiessi |
| Support Opportunities: | BIOTA-FAPESP Program - Regular Research Grants |
| FAPESP's process: | 13/10676-1 - Reconstitution of sea surface temperature and salinity in the equatorial Brazilian in Late Holocene: paleoclimate inferences |
| Grantee: | Nancy Kazumi Taniguchi |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 16/10242-0 - Occurrence and impact of the mega-South Atlantic Convergence Zone over the eastern South America during the last glacial period: a paleoceanographic approach |
| Grantee: | Marília de Carvalho Campos Garcia |
| Support Opportunities: | Scholarships in Brazil - Doctorate |