Randi Dieckman. DECADE 80’S 80’S DECADE-”LAURA ASHLEY PHENOMENON”
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Scientific Results using a Decade of Data Collected by the PNBOIA Program in the South Atlantic Olga T. Sato, Ph.D. Guilherme Campano [email protected] Oceanographic Institute – University of São Paulo Olga T. Sato (IOUSP) 1 / 17
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Scientific Results using a Decade of Data Collected by the PNBOIAProgram in the South Atlantic
Olga T. Sato, Ph.D. Guilherme [email protected]
Oceanographic Institute – University of São Paulo
Olga T. Sato (IOUSP) 1 / 17
Roteiro
1 IntroductionThe ProgramData StatisticsTemperature and Velocity FieldsVariability and Trends
Olga T. Sato (IOUSP) 2 / 17
Introduction
Roteiro
1 IntroductionThe ProgramData StatisticsTemperature and Velocity FieldsVariability and Trends
Olga T. Sato (IOUSP) 3 / 17
Introduction The Program
Programa Nacional de Bóias - PNBOIA
Brazilian National Drifter ProgramActivities since 1997 under theGOOS/Brazil programPart of the Global Drifter ProgramMain goal: To obtain and distributeoceanographic and meteorologicalmeasurements on the Atlanticthrough an array of drifting andmoored buoys;Universities, research institutions,government and private sectors, andthe Navy (responsible for launchingoperations).
Olga T. Sato (IOUSP) 4 / 17
Introduction The Program
Some specifics of the drifters
Surface Velocity Program (SVP) drifterwith a 15 m drogue (holey-sock)Measurements:
1 Water temperature (20-30 cm under thesurface)
2 Position and time velocity at 15 m3 Atmospheric pressure (SVP-B)
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Introduction Data Statistics
Spaghetti Plot - Drifters deployed since 1999
75 drifters predicted tobe deployed in 2010.
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Introduction Data Statistics
Data Distribution (1◦×1◦)
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Introduction Temperature and Velocity Fields
SST measured by the drifters
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Introduction Temperature and Velocity Fields
WOA09 monthly mean SST
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Introduction Temperature and Velocity Fields
SST difference (PNBOIA minus WOA09)
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Introduction Temperature and Velocity Fields
Near–Surface Current Velocity: 1◦×1◦
Hansen and Poulin(1996) scheme tofilter thetemperature andvelocity;
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Introduction Temperature and Velocity Fields
Surface Velocity Field at the SW Corner from Buoys
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Introduction Temperature and Velocity Fields
Surface Velocity Field from Altimeters - AVISO
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Introduction Variability and Trends
Velocity Variability at the SW Corner
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Introduction Variability and Trends
Conclusions 12
Some of the main dynamical features of the Atlantic is captured bythe statistical analysis of the trajectories of the drifters, e.g.,boundary currents, recirculation regions, etc.There are indications of warming and cooling trends in some partsof the South Atlantic as measured by drifters in comparison withclimatology; at the Brazil–Malvinas confluence this evidence isclearer.The analysis of the current velocities measured by the driftersshows an increase of its variability after 2006. This trend iscorroborated with altimeter derived velocities as well.
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Introduction Variability and Trends
goosbrasil.org
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Introduction Variability and Trends
Thank You!
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