A5043910582- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- Geology and Paleoclimatology Research
- Geological and Geophysical Studies
- Marine and fisheries research
- Arctic and Antarctic ice dynamics
- Ocean Acidification Effects and Responses
- Coral and Marine Ecosystems Studies
- Ocean Waves and Remote Sensing
- Island Studies and Pacific Affairs
- Underwater Acoustics Research
- Marine animal studies overview
- Coastal and Marine Management
- Methane Hydrates and Related Phenomena
- Meteorological Phenomena and Simulations
- Soil Moisture and Remote Sensing
- Oil Spill Detection and Mitigation
- Pacific and Southeast Asian Studies
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Food Industry and Aquatic Biology
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2009-2023
Institut de Recherche pour le Développement
2008-2022
Centre National de la Recherche Scientifique
2004-2022
Université de Toulouse
2009-2022
Institut de Recherche pour le Développement
1996-2018
Université Toulouse III - Paul Sabatier
2004-2018
Observatoire Midi-Pyrénées
2006
Institut de Recherche pour le Développement
2001
Institut de Recherche pour le Développement
1999
Secretariat of the Pacific Community
1987-1998
The western equatorial Pacific warm pool is subject to strong east-west migrations on interannual time scales in phase with the Southern Oscillation Index. dominance of surface zonal advection this migration demonstrated four different current data sets and three ocean models. eastward less saline water from together westward cold more central-eastern induces a convergence masses at eastern edge well-defined salinity front. location zonally displaced association El Nino-La Nina wind-driven...
In the tropical oceans density mixed layer does influence ocean‐atmosphere interactions, a feature that is fundamental to development of energetic climatic events such as El Niño‐Southern Oscillation (ENSO) phenomenon. The aim this work take advantage existing sea surface temperature (SST) and velocity together with future salinity (SSS) satellite‐derived data by assimilating these in primitive equation model order improve modeled layer. As satellite SSS are not yet available, better analyze...
Sea surface bucket measurements, obtained through a ship‐of‐opportunity program, are used to describe the sea salinity (SSS) field for tropical Pacific during period 1969–1988. Emphasis is placed upon mean SSS distribution and seasonal interannual variability occurring along four well‐sampled shipping tracks. These tracks extend from New Zealand Japan, Hawaii, Tahiti California, Panama. They cross equator at 155°E, 160°W, 140°W, 100°W, respectively. Along each track, characterized by minima...
Abstract Remote sensing of salinity using satellite-mounted microwave radiometers provides new perspectives for studying ocean dynamics and the global hydrological cycle. Calibration validation these measurements is challenging because satellite in situ methods measure differently. Microwave top few centimeters ocean, whereas most observations are reported below a depth meters. Additionally, satellites as spatial average over an area about 100 × km2. In contrast, sensors provide pointwise at...
[1] The recent detection of a central Pacific type El Niño has added new dimension to the Niño-Southern Oscillation climatic puzzle. Sea surface salinity (SSS) observations collected during 1977–2008 in tropical are used contrast three eastern (EP) (1982–1983, 1991–1992, 1997–1998) and seven (CP) (1977–1978, 1986–1988, 1990–1991, 1992–1995, 2002–2003, 2004–2005, 2006–2007) types events, as well six EP (1985–1986, 1988–1989, 1995–1996, 1999–2001, 2005–2006, 2007–2008) two CP (1983–1984,...
Abstract Changes in the global water cycle are expected as a result of anthropogenic climate change, but large uncertainties exist how these changes will be manifest regionally. This is especially case over tropical oceans, where observed estimates precipitation and evaporation disagree considerably. An alternative approach to examine near-surface salinity. Datasets Pacific Atlantic salinity combined with model simulations used assess possible causes significance late twentieth century. Two...
We present a 47‐year‐long record of sea surface temperature (SST) derived from Sr/Ca and U/Ca analysis massive Porites coral which grew at ∼ 4150 calendar years before (B.P.) in Vanuatu (southwest tropical Pacific Ocean). Mean SST is similar both the modern instrumental paleorecord, exhibit El Niño‐Southern Oscillation (ENSO) frequency oscillations. However, several strong decadal‐frequency cooling events marked modulation seasonal cycle, with power ENSO decadal frequencies, are observed...
The distribution of salt in the tropical Pacific Ocean and its variability are potentially important better understanding El Niño Southern Oscillation (ENSO) ocean‐atmosphere coupled system. Complementary data sets (including sea surface salinity (SSS) derived from a ship‐of‐opportunity network, Geosat level zonal currents, outgoing longwave radiation‐derived precipitation, evaporation, cruise measurements along 165°E longitude) used to describe understand SSS changes western equatorial over...
Equatorial Kelvin and Rossby waves are comprehensively demonstrated over most of the equatorial Pacific basin, through their signatures in sea level zonal surface geostrophic current anomalies. This was made possible with altimeter data pertaining to first year Geosat (Geodetic Satellite) 17‐day exact repeat orbit (November 8, 1986, November 1987). To this end, along‐track corrected anomalies (SLAs), relative time period interest, were smoothed using nonlinear linear filters. The original...
Major features of the equatorial portion western Pacific warm pool (WP) were brought to light through analysis an unprecedented collection temperature and salinity profiles derived from Argo floats 2000 2007. A region thick (>15–25 m) quasi‐permanent barrier layers (BLs) was found occur in a band 10° 20° longitude west maximum zonal sea surface gradient (∂ S/ ∂ x ), which occurs at eastern edge WP. In this region, BLs associated maxima ) displaced eastward (westward) during El Niño (La...
The dominant mode of variability in the tropical Pacific is interannual El Niño–Southern Oscillation phenomenon. More subtle variations are also evident on decadal timescales reminiscent Decadal (PDO). These superimposed trends that possibly linked to global climate change. A major impediment for assessing this and longer timescale shortness instrumental records. Near‐surface salinity has not yet been systematically analyzed reason. This article documents interprets 1970–2003 observed sea...
The freshest surface waters in the tropical Pacific are found at its eastern boundary. Using situ observations, we depict quasi‐permanent presence of a far fresh pool with sea salinity (SSS) lower than 33, which is confined between Panama's west coast and 85°W December extends westward to 95°W April. Strong SSS fronts outer edge this pool. We investigate seasonal dynamics using complementary satellite wind, rain, level oceanic current data surface, along hydrographic profiles. appears off...
Interannual global mean sea level (GMSL) variations and El Nino-Southern Oscillation (ENSO) are highly correlated, with positive/negative GMSL anomalies during Nino/La Nina events. In a previous study, we showed that interannual total land water storage inversely lower-than-average on higher-than-average Nino. This result is in agreement the observed rainfall deficit/excess over land/oceans Nino (and vice versa La Nina). It suggests positive anomaly likely due to an ocean mass rather than...
Recent analyses of physical measurements show the existence a central Pacific type El Niño (CPEN) with sea surface temperature warming pattern distinct from that “classical” eastern (EPEN). In this study, we analyze chlorophyll signature Niño‐Southern Oscillation (ENSO), using monthly maps satellite‐derived anomalies between September 1997 and December 2010. We identify five typical ENSO structures. The first structure describes lonely 1997–1998 EPEN period, second third represent La Niña,...
Seasonal and El Niño‐Southern Oscillation (ENSO)‐related variations of sea surface temperature (SST) salinity (SSS), 0/450‐dbar dynamic height anomalies (η, an alias for level), zonal (τ x ) meridional y wind stress, stress curl (curl (τ)), precipitation ( P are examined in the tropical Pacific during 1961–1995. In equatorial band Niño (La Niña) events chiefly concerned (1) east center, with warmer (colder) than average SST a η increase (decrease), (2) west, fresher (saltier) SSS, westerly...
In the Pacific equatorial band zonal displacement of eastern edge warm pool, subject to insignificant seasonal variations, is dominated by strong interannual variations almost in phase with Southern Oscillation Index. Over 1971–1973 El Niño‐La Niña period, Gill (1983) suggested that such was caused solely horizontal advection current anomaly. Basin‐wide Geosat‐derived surface anomalies are available during 1986–1989 and they agree quite well observed currents western central Pacific. Within...
The eastern edge of the western Pacific warm pool corresponds to separation between warm, rainfall‐induced low‐salinity waters and cold, high‐salinity upwelled cold tongue in central‐eastern equatorial Pacific. Although not well defined sea surface temperature (SST), this is characterized by a sharp salinity front that trapped equator. Several studies, using numerous situ satellite data three classes ocean models, indicate result zonal convergence central water masses into pool. This occurs...