Gabriel Clauzet

Tetra Tech (Brazil)

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Ilana Wainer

Universidade de São Paulo

Esther C. Brady

NSF National Center for Atmospheric Research

Murray Burling

Tetra Tech (Brazil)

Bette L. Otto‐Bliesner

NSF National Center for Atmospheric Research

Eduardo A. Yassuda

Tetra Tech (Brazil)

Clarissa Brelinger de Luca

Tetra Tech (Brazil)

Jacques Servain

Fundação Cearense de Meteorologia e Recursos Hídricos

Valéria Souza Rego

Petrobras (Brazil)

Izabel Christina Martins Nogueira

Universidade Federal do Rio de Janeiro

Gabriel Carvalhaes Aloi Paschoal

Universidade de São Paulo

Cooperative Institutions

Universidade de São Paulo

Institut Français de la Mer

NSF National Center for Atmospheric Research

Universidade Brasil

Climate and Global Dynamics Laboratory

Universidade Federal do Rio de Janeiro

Petrobras (Brazil)

Sorbonne Université

Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques

Institut de Recherche pour le Développement

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Identificação da variabilidade de baixa freqüência em algumas regiões da costa sudeste-nordeste do Brasil

Revista Brasileira de Oceanografia (1999)

Gabriel Clauzet Ilana Wainer

Neste trabalho, séries temporais de 35 anos, dos parâmetros de superficie marinha da costa SE do Brasil e em particular das regiões de Cananéia e Ubatuba são examinadas. Procurou-se situar, num contexto global de larga escala, as variações climáticas locais. A variabilidade de baixa freqüência nas estações costeiras brasiieirás está relacionada, com fenômenos climáticos de larga escala como o ENSO (El Niiio -Southem Oscillation) e o dipolo do Atlântico. Concluiu-se que o fenômeno ENSO tem influências diretas sobre as. séries temporais ao longo de toda costa, mas não as determina. O dipolo do Atlântico tem pouca influência na costa SE do Brasil. Na região Nordeste o impacto do dipolo do Atlântico é significativo na escala decadal.

10.1590/s1413-77391999000100006

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Times-scales of variability from the high frequency PIRATA data revealed by wavelet analysis

HAL (Le Centre pour la Communication Scientifique Directe) (2005)

Jacques Servain Gabriel Clauzet Ilana Wainer

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Time scales of upper ocean temperature variability inferred from the PIRATA data (1997–2000)

Geophysical Research Letters (2003)

Ilana Wainer Gabriel Clauzet Jacques Servain Jacyra Soares

Time series from the PIRATA 10‐minute measurements are investigated in order to study the upper‐ocean thermal field time‐scales of variability using the serial covariance power spectra method and wavelet analysis. This is one of the few studies that analyze in time and space the PIRATA buoy data in the region. Analysis of the depth of the 20°C isotherm show distinct patterns for the northwestern Atlantic at 8N–38W and the southeastern Atlantic, at 10S–10W. In the west, warm surface waters are accompanied by a shallower thermocline while in the east warm surface waters are associated with its deepening, consistent with Houghton [1991] . At higher frequencies the dominant signals in sea surface temperature are the diurnal and semi‐diurnal cycles. Spectral analysis of the depth of the 20°C isotherm show a predominance of the semi‐diurnal period. In the eastern Atlantic there are two additional dominant bands in the spectra: 10–14 days, 25–27 days and for the depth of the 20°C isotherm there is also a lower frequency band at 20–40 days associated with tropical instability waves at the equator. The first band can be associated with atmospherically forced motions and the lower frequency band with barotropic instability waves.

Tropical Atlantic

Buoy

10.1029/2002gl015147

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A numerical study of the South Atlantic circulation at the Last Glacial Maximum

Palaeogeography Palaeoclimatology Palaeoecology (2007)

Gabriel Clauzet Ilana Wainer Alban Lazar Esther C. Brady Bette L. Otto‐Bliesner

Last Glacial Maximum

10.1016/j.palaeo.2007.06.018

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Climate Sensitivity of Moderate- and Low-Resolution Versions of CCSM3 to Preindustrial Forcings

Journal of Climate (2006)

Bette L. Otto‐Bliesner Robert A. Tomas Esther C. Brady Caspar M. Ammann Zavareh Kothavala

Abstract Preindustrial (PI) simulations of the Community Climate System Model version 3 (CCSM3) at two resolutions, a moderate and a low resolution, are described and compared to the standard controls for present-day (PD) simulations. Because of computational efficiency, the moderate- and low-resolution versions of CCSM3 may be appropriate for climate change studies requiring simulations of the order of hundreds to thousands of years. The PI simulations provide the basis for comparison for proxy records that represent average late Holocene conditions. When forced with PI trace gases, aerosols, and solar irradiance estimates, both resolutions have a global cooling of 1.2°–1.3°C, increased sea ice in both hemispheres, and less precipitation near the equator and at midlatitudes as compared to simulations using PD forcing. The response to PI forcings differs in the two resolutions for North Atlantic meridional overturning circulation (MOC), the Antarctic Circumpolar Current (ACC), and ENSO. The moderate-resolution CCSM3 has enhanced ACC, North Atlantic MOC, and tropical Pacific ENSO variability for PI forcings as compared to PD. The low-resolution CCSM3 with more extensive sea ice and colder climate at high northern latitudes in the PD simulation shows less sensitivity of the North Atlantic MOC to PI forcing. ENSO variability and the strength of the ACC do not increase with PI forcing in the low-resolution CCSM3.

Forcing (mathematics)

Middle latitudes

10.1175/jcli3754.1

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Citations (82)

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Elsevier eBooks (2017)

Adriene Ferreira Pereira Alexandre de Caroli André Campos Kersten Schmidt Belmiro Mendes de Castro Filho Carlos Eduardo Parente Ribeiro

10.1016/b978-85-352-9016-5.50007-3

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Last Glacial Maximum in South America: Paleoclimate proxies and model results

Geophysical Research Letters (2005)

Ilana Wainer Gabriel Clauzet Marie‐Pierre Ledru Esther C. Brady Bette L. Otto‐Bliesner

Observations in South America based on paleoenvironmental data for the Last Glacial Maximum (LGM) that shows a generally lower temperatures and reduced precipitation of the region are compared to simulation results from the paleoclimate version of the National Center for Atmospheric Research coupled climate system model. Analyses of the LGM wind simulation for the tropical Atlantic show that the convergence zone does not extend all the way into South American continent during the Austral summer. This would have prevented moisture inflow into the adjacent continental area of equatorial northeastern Brazil. Interpretations of paleoclimate proxy records from this region are consistent with this scenario. In the subtropics, LGM westerlies were weaker and data show characteristics of more humid conditions. At higher latitudes model simulations suggest intensification of the westerlies which, in combination with colder sea surface temperatures would imply less moisture influx into the South American continent from the Atlantic sector. Low lake levels in high southern latitudes and general aridity would support the model findings.

Paleoclimatology

Westerlies

Last Glacial Maximum

10.1029/2004gl021244

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Citations (39)

Autores

Elsevier eBooks (2015)

Adriene Ferreira Pereira Alexandre de Caroli André Campos Kersten Schmidt Belmiro Mendes de Castro Filho Carlos Eduardo Parente Ribeiro

10.1016/b978-85-352-6208-7.50004-0

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Idêntificação da variabilidade de baixa freqüência em algumas regiões da costa sudeste-nordeste do Brasil (Identification ofthe low-frequency variability in some coastal stations ofthe southeast coast of Brazil)

Gabriel Clauzet Ilana Wainer

. Abstract: In this study time series of marine surface parameters for 35 years along the south east coast of Brazil, in particular for the regions of Cananeia and Ubatuba are examined. The goal was to look for regional cIimate indications of global cIimate impacts in the 10w-fTequencyrange of the spectrum in phenomena such as ENSO (El Niiio - Southern Oscillation) and the AtIantic ocean dipole. It was fouDdthat ENSO has a direct impact over the time series along the coast but does not determine then. The Atlantic dipole has little impact on the SE coast of Brazil. In the NE region, its impact on the decadal time scale is significant. . Resumo: Neste trabalho, series temporais de 35 anos, dos parâmetros de superficie marinha da costa SE do Brasil e em particular das regioes de Cananeia e Ubatuba sao examinadas. Procurou-se situar, num contexto global de larga escala, as variacoes climaticas locais. A variabilidade de baixa fTequencianas estacoes costeiras brasiieiras esta relacionada, com fenomenos climaticos de larga escala como o ENSO (El Niiio Southern Oscillation) e o dipolo do Atlântico. Concluiu-se que o fenomeno ENSO tem influencias diretas sobre as. series temporais ao longo de toda costa, mas nao as determina. O dipolo do Atlântico tem pouca influencia na costa SE do Brasil. Na regiao Nordeste o impacto do dipolo do Atlântico e significativo na escala decadal. . Descr;ptors: Seasonal variation, Surface marine data. · Descr;tores: Variacao sazonal, Dados de superficie marinha.

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Identificação da variabilidade de baixa freqüência em algumas regiões da costa sudeste-nordeste do Brasil Identification ofthe low-frequency variability in some coastal stations of the southeast coast of Brazil

DOAJ (DOAJ: Directory of Open Access Journals) (1999)

Gabriel Clauzet Ilana Wainer

10.1590/s1679-87591999000100006

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