A5025727459- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Ocean Waves and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Geology and Paleoclimatology Research
- Geological and Geophysical Studies
- Tropical and Extratropical Cyclones Research
- Hydrocarbon exploration and reservoir analysis
- Marine and fisheries research
- Coral and Marine Ecosystems Studies
- Underwater Acoustics Research
- Geophysics and Gravity Measurements
- Arctic and Antarctic ice dynamics
- Coastal and Marine Management
- Marine Bivalve and Aquaculture Studies
- Fluid Dynamics and Turbulent Flows
- Gas Sensing Nanomaterials and Sensors
- Smart Materials for Construction
- Plant Water Relations and Carbon Dynamics
- Soil and Land Suitability Analysis
- Methane Hydrates and Related Phenomena
- Modeling, Simulation, and Optimization
- Oil Spill Detection and Mitigation
Universidade de São Paulo
2015-2024
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2023
Argentine Naval Hydrographic Service
2023
University of Buenos Aires
2023
UNSW Sydney
2021
ARC Centre of Excellence for Climate System Science
2021
National Institute for Space Research
2002-2003
Jet Propulsion Laboratory
2000
California Institute of Technology
2000
University of Rhode Island
1995
Abstract By collocating 10 years (1999–2009) of remotely sensed surface turbulent heat fluxes with satellite altimetry data, we investigate the impact oceanic mesoscale eddies on latent and sensible in South Atlantic Ocean. In strongly energetic regions, such as Brazil–Malvinas confluence Agulhas Current Retroflection, explain up to 20% total variance averaged anomalies ± (10–20) W/m 2 . Cyclonic (anticyclonic, respectively) are associated negative (positive) flux that tend cool (warm)...
Abstract Six years of simultaneous moored observations near the western and eastern boundaries South Atlantic are combined with satellite winds to produce a daily time series basin‐wide meridional overturning circulation (MOC) volume transport at 34.5°S. The results demonstrate that barotropic baroclinic signals both cause significant variations, as such must be concurrently observed. data, spanning ~20 months during 2009–2010 ~4 2013–2017, reveal highly energetic MOC record temporal...
Abstract The excess heat absorbed from the atmosphere has increased temperature in upper layers of ocean (<2,000 m). In abyss, infrequently repeated ship sections, deep Argo float measurements, and sparse moored observations have found signs warming Southwest Atlantic, possibly linked to changes Weddell Sea. We present a new time series sampled near bottom Vema Channel, February 2019 August 2020. Together with historical data, combined record confirms abyssal waters, an increase 0.059°C...
Abstract Since the inception of international South Atlantic Meridional Overturning Circulation initiative in 21st century, substantial advances have been made observing and understanding Southern Hemisphere component (AMOC). Here we synthesize insights gained into overturning flows, interocean exchanges, water mass distributions pathways Atlantic. The circulation uniquely carries heat equatorward exports freshwater poleward consists two strong cells. Density pressure gradients, winds,...
South Atlantic subtropical mode water (SASTMW) is detected using temperature and salinity profiles obtained by Argo floats. Marked low potential vorticity within its extent, waters are identified homogeneous values, both horizontally vertically. Their presence evident in three regions: the Brazil Current recirculation gyre on western side of basin, eastern along southern edge gyre. Formation occurs between winter mid-spring regions cumulative cooling ocean. We showed that profilers do not...
The Meridional Overturning Circulation (MOC) is a primary mechanism driving oceanic heat redistribution on Earth, thereby affecting Earth's climate and weather. However, the full-depth structure variability of MOC are still poorly understood, particularly in South Atlantic. This study presents unique multiyear records volume transport both upper (<~3100 meters) abyssal (>~3100 overturning cells based daily moored measurements Atlantic at 34.5°S. vertical time-mean flows consistent with...
Abstract Both vortices and baroclinic Rossby waves show up as westward‐propagating features in the sea surface height anomaly (SSHA) records when displayed form of zonal‐temporal or Hovmöller diagrams. A chain filters was used to separate SSHA into orthogonal components. Each filtered components then reassembled a set maps. In maps individual components, we clearly see westward propagating waves. Our most striking findings are: (i) limited within their critical latitudes, wave extrema...
Abstract. The Deep Western Boundary Current (DWBC) at 34.5° S in the South Atlantic carries a significant fraction of cold deep limb Meridional Overturning Circulation (MOC), and therefore its variability affects meridional heat transport consequently regional global climate. Nearly 6 years observations from line pressure-equipped inverted echo sounders (PIESs) have yielded an unprecedented data set for studying characteristics time-varying DWBC volume S. Furthermore, horizontal resolution...
The Atlantic meridional overturning circulation (AMOC) is a vitally important component of the global ocean because its impact on climate, weather, and ecosystems. South key gateway for water mass exchanges between other basins as southward freshwater transport at 34.5&#176;S increases likelihood an AMOC collapse in future. In two-thirds state-of-the-art coupled climate models, northward monostable, whereas most observations find that suggesting bistable. upper limb Deep Western Boundary...
Oceanic heat storage and rate are correlated to the sea surface height anomaly signals from TOPEX/Poseidon altimeter data 1992 1998. The decomposed through two‐dimensional finite impulse response filtering. signal components basin‐scale (seasonal), westward propagating (Rossby waves), eastward (Kelvin mesoscale eddies a small‐scale residual. sum of these filtered does not depart significantly original signal. Correlations rms differences calculated compare estimates on basis in situ at four...
Abstract The variability of the Atlantic meridional overturning circulation (AMOC) has considerable impacts on global climate system. Past studies have shown that changes in South control stability AMOC and drive an important part its variability. That is why significant resources been invested a (S)AMOC observing In January 2017, RV Maria S. Merian conducted first GO‐SHIP hydrographic transect along SAMOC‐Basin Wide Array (SAMBA) line at 34.5°S Atlantic. This paper presents estimates...
Abstract Variations in the mass and heat transported by meridional overturning circulation (MOC) have important, well‐documented, influences on global regional climate, weather, ecosystems, coastal sea levels. However, continuous, high‐frequency, observations of these quantities been limited to date. Multiple years full‐depth daily from moored instruments South Atlantic at 34.5°S are combined with satellite resolve volume transports both upper abyssal MOC cells, associated transport (MHT),...
The influx of warmer and saltier Indian Ocean waters into the Atlantic—the Agulhas leakage—is now recognized to play an important role in global thermohaline circulation climate. In this study results a ⅞° simulation with Hybrid Coordinate Model, which exhibit augmentation leakage, is investigated. This increase leakage ought have impact on meridional oceanic volume heat transports Atlantic Ocean. Significant linear trends found integrated transport at 20°, 15°, 5°S correlate well decadal...
Sea surface height anomalies from satellite altimeter data are used to estimate heat storage. Since variability in sea is mostly due expansion and contraction of the water column it can be correlated with variations salt content. Therefore, estimation storage data, when compared situ estimates, requires corrections for haline effect. Three sites a nearly continuous time series temperature salinity profiles simultaneous TOPEX/POSEIDON studied: HOT, CalCOFI Hydrostation “S”. Haline based on...
Historical hydrographic sections are used to investigate the seasonal and interannual variability in meridional heat flux at 36°N North Atlantic. The data consist of ten transatlantic from four sectors, which combined, cross entire basin. These sectors slope water, Gulf Stream, Sargasso Sea, midocean. first three actually come that span all regions, but their properties examined individually. To improve estimates Stream contribution total flux, a tangent hyperbolic model current’s...
Changes in the oceanic heat storage (HS) can reveal important evidences of climate variability related to ocean fluxes. Specifically, long‐term variations HS are a powerful indicator change as represents balance between net surface energy flux and poleward transported by currents. is estimated from sea height anomaly measured altimeters TOPEX/Poseidon Jason 1 1993 2006. To characterize validate altimeter‐based Atlantic, we used data Pilot Research Moored Array Tropical Atlantic (PIRATA)...
Abstract Time series (2002–2018) of a global monthly objectively analyzed fields temperature and salinity were used to investigate the South Atlantic subtropical mode water (SASTMW). It is characterized as homogeneous layers in range 13 16 °C with low potential vorticity. Three different types SASTMW distinguished allowing us evaluate their temporal volumetric variation. Each type has its distinct spatial distribution patterns consequently dissimilar This variability seen volume anomaly...
Propagating signals with periods of ∼50 days are detected in global sea surface height anomaly data from the TOPEX/Poseidon altimeter. The is converted into heat storage because its thermodynamical and biological interest. Both time series organized zonal‐temporal diagrams for each latitude band‐pass filtered. filters separate spectral band on order 35–65 wavelengths 500–2000 km within 12.5° equator. main objectives to identify dynamical regime observed variability, locate regions persistent...
High-resolution satellite imagery is a valuable data source to analyse ocean submesoscale dynamics (i.e., with spatial scales of the order 1–10 km) and investigate their impact on turbulent mixing, energetics mesoscale vortices, instability processes or phytoplankton blooms. However, acquired by sensors often suffer from instrumental noise that degrades image quality therefore compromises detection fronts as well estimation its physical characteristics. A well-known artefact in...
Abstract The variability in the meridional Ekman heat flux estimated using wind data from four different sources is examined. vectors are obtained European Remote Sensing (ERS), Quick Scatterometer (Quikscat), and Special Sensor Microwave Imager (SSM/I) satellite instruments National Centers for Environmental Prediction (NCEP) model. datasets range over a period of 10 years except Quikscat, which spans between 1999 2003. comparison annual mean zonally integrated shows some discrepancies. In...
Abstract This study uses the global Ocean Topography Experiment (TOPEX)/Jason-1 altimeters’ time series to estimate 13-yr trend in sea surface height anomaly. These trends are estimated at each grid point by two methods: one fits a straight line and other is based on difference between average halves of series. In both cases shows large regional variability, mostly where intense western boundary currents turn. The authors hypothesize that variability leads changes local geostrophic...
Ongoing efforts are dedicated by meteorological and oceanographic agencies to improve the accuracy of Sea Surface Temperature (SST) estimates from satellite observations via improved retrieval algorithms validation data. An important application satellite-based SST is analysis spatio-temporal characteristics ocean fronts, which depend on several parameters including scheme Top-of-Atmosphere Brightness Temperatures. In this study, we focus two widely used algorithms, namely Multichannel...
Abstract We investigated the formation and evolution of South Atlantic subtropical mode water using data from profiling conductivity, temperature, depth sensors (CTD) deployed in April–May 2015 two customized Argo floats that drifted April to June 2017. From CTD data, we observed a layer below seasonal thermocline deepened southern side area north. The remained proximity cruise for 2 years. Their slow displacement recirculating patterns allowed us observe changes temperature salinity...