A5065820434- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Ocean Waves and Remote Sensing
- Marine and fisheries research
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Tropical and Extratropical Cyclones Research
- Geological formations and processes
- Atmospheric and Environmental Gas Dynamics
- Underwater Acoustics Research
- Geological and Geophysical Studies
- Arctic and Antarctic ice dynamics
- Ocean Acidification Effects and Responses
- Astronomical Observations and Instrumentation
- Climate Change and Environmental Impact
- Astro and Planetary Science
- History and Developments in Astronomy
- Maritime and Coastal Archaeology
- Scientific Research and Discoveries
- Historical and Archaeological Studies
- Stellar, planetary, and galactic studies
- Meteorological Phenomena and Simulations
- Solar and Space Plasma Dynamics
NOAA Atlantic Oceanographic and Meteorological Laboratories
2013-2023
National Oceanic and Atmospheric Administration
2002-2023
University of Miami
2001-2020
Woods Hole Oceanographic Institution
1999
Office of Polar Programs
1998
Columbia University
1983-1997
Lamont-Doherty Earth Observatory
1983-1994
Goddard Institute for Space Studies
1992
Institut Océanographique
1979-1982
Délégation Paris 6
1981
observing the Global ocean with Profiling Floats
Editors note: For easy download the posted pdf of State Climate for 2011 is a very low-resolution file. A high-resolution copy report available by clicking here. Please be patient as it may take few minutes file to download. Supplemental figures and datasets are
A subset of the Benguela Sources and Transports (BEST) 1992–1993 data is analyzed to study magnitude variability large scale transports in area. The consist inverted echo sounder series conductivity‐temperature‐depth stations. mean 16 month transport values for upper 1000 m indicate that, 13‐Sv northward within Current, 50% derived from central Atlantic (which geometry may be chiefly South water), 25% comes Indian Ocean Agulhas remaining a blend tropical water. simple schematic pattern with...
We use data from Geosat altimeter and 10 inverted echo sounder (IES) moorings deployed in the SW Atlantic Ocean off Argentine continental shelf to investigate several aspects of dynamics upper layer Brazil‐Malvinas Confluence region. estimate sea height anomalies at each IES location compute thickness, taken this work go depth 8°C isotherm. first discuss thickness variations caused by passage Brazil Current, Malvinas warm anticyclonic cold cyclonic eddies. introduce a two‐layer model which...
We analyze the variability of thermal structure associated with Atlantic North Equatorial Countercurrent (NECC) and its relation to seasonally varying winds. The analysis performed allows us establish period time region where NECC reverses direction. West 25°W, depth thermocline in southern side (4 7°N) annually oscillates 180° out phase oscillations on northern (7 10°N). East 25°W rises falls nearly across countercurrent. If flow can be uniquely presumed from structure, disappears during...
[1] A combination of surface drifters and altimetry is used to analyze the seasonal interannual variability velocity field in Brazil-Malvinas confluence western South Atlantic Ocean. Longer-term changes are inferred from wind sea temperature fields. During period October 1992 December 2007, a southward shift −0.6 −0.9° decade−1 found latitude Brazil Malvinas currents. A comparable trend maximum stress curl averaged across basin, allowing proxy for be calculated prealtimeter time period. This...
Data from two boundary arrays deployed along 34.5°S are combined to produce the first continuous in situ time series observations of basin‐wide meridional overturning circulation (MOC) South Atlantic. Daily estimates MOC between March 2009 and December 2010 range 3 Sv 39 (1 = 10 6 m s −1 ) after a day low‐pass filter is applied. Much variability this ∼20 month record occurs at periods shorter than 100 days. Approximately two‐thirds due changes geostrophic (baroclinic plus barotropic) volume...
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...
The transfer of warm water from the Indian Ocean into South Atlantic subtropical gyre takes place in form rings and filaments formed when Agulhas Current retroflects south Africa between IS 25E. A survey September 1992 until December 1995 Retroflection region was carried out using TOPEX/POSEIDON altimeter data. two-layer model used to estimate upper layer thickness altimeter-derived sea-surface height anomaly An objective analysis scheme construct a map every ten days. Seventeen their...
Variability of the Atlantic Meridional Overturning Circulation (AMOC) and its effect on net northward heat transport (NHT) in South are examined using a trans‐basin expendable bathythermograph (XBT) high‐density line at 35°S (AX18). The time‐mean AMOC is 17.9 ± 2.2 Sv during 2002–2007. Although geostrophic dominates AMOC, both Ekman transports important explaining variability. contributions to show annual cycles, but they out phase, resulting weak seasonal variability AMOC. NHT significantly...
Recent mooring observations of ocean temperature provide the first high resolution, long term record variability in Makassar Strait Indonesian Seas. The span entire cycle strong 1997/1998 El Niño. A correlation (r = 0.67) is found between average thermocline temperature, to southward volume transport: during (low) transport, also (low). In addition, from nearly 15 years XBT data, shown be highly correlated 0.77) SOI. This reveals that field–when coupled with throughflow–transmits equatorial...
A subset of data collected as a part larger program, the North Brazil Current Rings (NBCR) Experiment, is analyzed to study variability transport (NBC) and its relation with shedding rings. It concluded that there direct between latitude penetration, number rings shed, intensity NBC. The set consists dynamic height time series derived from three inverted echo sounders shallow pressure gauge deployed along section perpendicular South American coast continent 7°N, 48° 45°W. Velocity...
The meridional overturning circulation (MOC) is a global system of surface, intermediate, and deep ocean currents. MOC connects the surface layer atmosphere with huge reservoir sea primary mechanism for transporting heat, freshwater, carbon between basins. Climate models show that past changes in strength were linked to historical climate variations. Further research suggests will continue modulate change scenarios on time scales ranging from decades centuries [ Latif et al ., 2006].
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...
A field program to study the circulation of Benguela Current and its extension into southeastern Atlantic Ocean has completed survey instrument deployment phase. We report here new observations three Agulhas rings north west Cape Town, South Africa. Three mesoscale anticyclonic initially identified by means TOPEX/POSEIDON altimetry were surveyed with expendable bathythermographs, conductivity‐temperature‐depth‐oxygen profiles, direct current measurements from a lowered acoustic Doppler...
The 1992-1993 Benguela Sources and Transport (BEST) time series provide a quantitative view of the Current transport eddy field crossing 3OS, as well an estimate relation between its barotropic baroclinic components. This is done by simultaneous analysis BEST data derived from inverted echo sounders, pressure sensors, current meter moorings, CTD, ADCP stations. indicates that annual mean 13 Sv with total 16 Sv. Through combination instruments plus upper 2600 m was obtained without making any...
The seasonal cycle of mixed layer salinity and its causes in the Southern Ocean are examined by combining remotely sensed situ observations. domain‐averaged terms oceanic advection, diffusion, entrainment, air‐sea freshwater flux (evaporation minus precipitation) largely consistent with evolution salinity, which increases from March to October decreases November February. This is attributed advection entrainment; plays only a minimal role. Both advection‐diffusion negative throughout year,...
Abstract The interocean exchange of water from the South Atlantic with Pacific and Indian Oceans is examined using output ocean general circulation model for Earth Simulator (OFES) during period 1980–2006. main objective this paper to investigate role exchanges in variability meridional overturning (AMOC) its associated heat transport (MHT) Atlantic. OFES shows a similar response AMOC variations that derived observations: 1 Sv (1 ≡ 106 m3 s−1) increase strength would cause 0.054 ± 0.003 PW...