inctAmbTropic II – Honorary Lecturer

O inctAmbtropic II co-patrocina juntamente com o programa CAPES-IODP (Projeto Geohazards) a vinda ao Brasil do prof. André Droxler, que durante o meses de Janeiro e Fevereiro de 2018 estará ministrado palestras e mini-cursos nas Universidades Federais do Rio Grande do Norte, Pernambuco e Bahia. A vinda do prof. Droxler foi uma iniciativa da profa. Helenice Vital (UFRN) membro do comitê gestor do inctAmbTropic II.

A programação resumida está apresentada abaixo juntamente com o resumé do prof. Droxler.

Professor André W. Droxler (Ph.D.)

Rice University – D of Earth, Environmental and Planetary Sciences – Houston, TX (USA)

"I am a professor in the Department of Earth Science and currently the Track Director of the Science Master’s Program – Subsurface Geoscience. My research has focused on studying the morphology of and the sediments accumulating on slopes and basin floors surrounding coral reefs and carbonate platforms. Over the past 30 years, I have conducted research programs mostly in the Bahamas, offshore Jamaica, along the Belize margin, in the western Gulf of Mexico, in the Maldives (Indian Ocean), along the Australian Great Barrier Reef and in the Gulf of Papua (Papua New Guinea). The main focuses of my research include the regional and global evolution of coral reefs through time, the paleo-oceanographic/climatic and sea level records archived in the sediments deposited around reefs and carbonate platforms. In contrast with my 30 years plus research a s a marine geologist, I am currently conducting research on Upper Cambrian Microbial Reefs in Mason County, Central Texas funded by an Industry Consortium in collaboration with my colleague Prof. Dan Lehrmann at Trinity University in San Antonio (Texas). My work has been funded by the National Science Foundation, the American Chemical Society, and grants from oil and gas companies. Before becoming an assistant professor at Rice in January 1987, I was a postdoctoral research scientist at the University of South Carolina from 1985 to 1986. I received my Master’s degree equivalent from the University of Neuchâtel (Switzerland) in 1978 and earned his Ph.D. from the Rosenstiel School of Marine and Atmospheric Sciences at the University of Miami (Florida) in 1984."

Course UFPE – Recife

For aditional information please contact: antonio.vicente@ufpe.br and  beatrice@ufpe.br

10-12 January 2018 – Short course “Mixed Carbonate Siliciclastic Margins: Reefs Establishment, Growth, and demise from Quaternary to Cambrian” – 6 hours per day (total 18 hours)

1. January 10: Modern Settings – Pleistocene Deglacial Establishment – Quaternary Interglacials

2. January 11: Neogene Evolution in the Gulf of Papua – Belize

3. January 12: Permian Reefs in West Texas and Cambrian Microbial Reefs in Central Texas

4. January 13-15: Fieldtrip

Course UFBA – Salvador

For aditional information please contact: ruykenji@gmail.com

22-24 January 2018 – Short course “Mixed Carbonate Siliciclastic Margins: Reefs Establishment, Growth, and demise from Quaternary to Cambrian” – 6 hours per day (total 18 hours)

1. January 22: Modern Settings – Pleistocene Deglacial Establishment – Quaternary Interglacials

2. January 23: Neogene Evolution in the Gulf of Papua – Belize

3. January 24: Permian Reefs in West Texas and Cambrian Microbial Reefs in Central Texas

4. January 25 Seminar: Science Behind Current Climate Change and Global Warming

5. January 26 Seminar: Climate and the Demise of the Mayan Civilization

Course UFRN – Natal

For aditional information please contact: geofis@ccet.ufrn.br

05-09 February 2018  – Short course “Transgressive Reefs: Modern to Cambrian” – 6 hours per day (total 18 hours)

1. February 05: Modern Settings – Pleistocene Deglacial Establishment – Quaternary Interglacials

2. February 06: Neogene Evolution in the Gulf of Papua – Belize

3. February 07: Permian Reefs in West Texas and Cambrian Microbial Reefs in Central Texas

4. February 08 – 09 :  Fieldtrip

5. February 19: Seminar: Science Behind Current Climate Change and Global Warming

#PlataformasCarbonáticas #NiveldoMar #Reuniões #MudançasClimáticas #Seminário

Novas Publicações dos GTs 2.1 e 3.2

Os GTs 2.1 Geodiversidade e Biodiversidade dos Substratos Plataformais  e 3.2 Ciclos Biogeoquímicos, Fluxo de CO2 e Acidificação do Oceano Atlântico Tropical,  publicaram recentemente dois trabalhos em periódicos conceituados, listado abaixo:

Gomes, MP, Vital, H, Bezerra, FHR, Castro, DL, 2014. The interplay between structural inheritance and morphology in the Equatorial Continental Shelf of Brazil. Marine Geology, 355, 150–161

Mapa batimétrico mostrando as principais falhas perfis batimétricos e sísmicos: (a) —Coroa das Lavadeiras b—arenitos de praia, c—Campo de dunes subaquosas de Guamaré, d— Coroa Branca, e—Vale Inciso do Açu, f— Vale Inciso do Apodi;  (B) Compartimentos batimétricos da platform continental. Principais falhas: 1—Afonso Bezerra; 2—Carnaubais; 3—Macau; 4—Ubarana; 5—Pescada; 6—Shelf Edge Faults; 7—Areia Branca.

Resumo:

The primary objective of this study is to assess the control of faults of the rift and post-rift stages on the shelf morphology of the Potiguar Basin in northeastern Brazil. This aborted rift basin was generated during the opening of the Equatorial Atlantic in the Aptian. The offshore portion of the continental margin consists of a narrow (~ 40 km) and shallow (~ 70 m below present sea-level) continental shelf with a very steep continental slope (1:11). Our dataset encompasses gravity, bathymetric, shallow seismic and structural data. The results indicate that low sedimentation rates during the Quaternary period contributed to the identification of structural controls in pre-Holocene rocks. The key evidence for fault reactivation on the seafloor is the link between coastal and shelf features associated with pre-Cenozoic structures of the Potiguar Basin. During periods of low sea level, the incision of shelf valleys was readjusted longitudinally and transversally due to the structural controls. Shelf gradient breaks are associated with the occurrences of coplanar ESE– WNW-oriented faults, and uplifted and subsided areas occur in between these fault systems. The results indicate a strong correlation between the margin geometry, modern shelf surface, near-surface expression, and the rift-phase faults, which appear to be reactivated in concordance with the present-day margin stress field. We conclude that neotectonics has influenced both the sediment deposition and morphology of the NE Brazilian Equatorial margin during Quaternary times.

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Servain, J, Caniaux, G, Kouadio, YK, McPhaden, MJ, Araujo, M. 2014. Recent climatic trends in the tropical Atlantic. Climatic Dynamics. DOI 10.1007/s00382-014-2168-7

Mudança na SST (°C) e PWS (m2/s2) durante 1964–1975 (a) and 1976–2012 (b). Os contornos em magenta indicam 95% do teste de confidência de Mann– Kendall para a SST; apenas os vetores PWS significativos de acordo com 95% do teste de confidência de Mann–Kendall estão plotados.

Resumo:

A homogeneous monthly data set of sea surface temperature (SST) and pseudo wind stress based on in situ observations is used to investigate the climatic trends over the tropical Atlantic during the last five decades (1964–2012). After a decrease of SST by about 1 °C during 1964–1975, most apparent in the northern tropical region, the entire tropical basin warmed up. That warming was the most substantial ([1 °C) in the eastern tropical ocean and in the longitudinal band of the intertropical convergence zone. Surprisingly, the trade wind system also strengthened over the period 1964–2012. Complementary information extracted from other observational data sources confirms the simultaneity of SST warming and the strengthening of the surface winds. Examining data sets of surface heat flux during the last few decades for the same region, we find that the SST warming was not a consequence of atmospheric heat flux forcing. Conversely, we suggest that long- term SST warming drives changes in atmosphere parameters at the sea surface, most notably an increase in latent heat flux, and that an acceleration of the hydrological cycle induces a strengthening of the trade winds and an acceleration of the Hadley circulation. These trends are also accompanied by rising sea levels and upper ocean heat content over similar multi-decadal time scales in the tropical Atlantic. Though more work is needed to fully understand these long term trends, especially what happens from the mid-1970’s, it is likely that changes in ocean circulation involving some combination of the Atlantic meridional overtuning circulation and the subtropical cells are required to explain the observations. 

#AtlânticoTropical #MudançasClimáticas #PlataformaContinental #TemperaturadaÁguadoMar