PIRATA

PIRATA
Name	PIRATA
Acronym	PIRATA
Established	1990s
Region	Tropical Atlantic
Type	Oceanographic mooring array
Partners	National Oceanic and Atmospheric Administration, Centre National de la Recherche Scientifique, Observatoire Midi-Pyrénées, Universidad de São Paulo, Instituto Oceanográfico de Universidade de São Paulo, Universidad Federal do Ceará, Institut Français de Recherche pour l'Exploitation de la Mer, Woods Hole Oceanographic Institution, National Aeronautics and Space Administration, European Space Agency, University of Miami, NOAA Atlantic Oceanographic and Meteorological Laboratory, Instituto Português do Mar e da Atmosfera, Servicio Meteorológico Nacional (Argentina), Instituto Español de Oceanografía, University of Cape Town, University of São Paulo (USP), University of Edinburgh, University of Bergen, Scripps Institution of Oceanography, Lamont–Doherty Earth Observatory

PIRATA

PIRATA is a tropical Atlantic oceanographic mooring network deployed to monitor air-sea interactions, ocean circulation, and climate variability. The array provides sustained in situ measurements used by researchers studying the El Niño–Southern Oscillation, Atlantic Meridional Mode, Madden–Julian Oscillation, and regional climate phenomena affecting West Africa, Brazil, and the Caribbean Sea. Data from the network support operational forecasting at institutions including NOAA, ECMWF, and Met Office and underpin studies published in journals like Nature, Science, and Journal of Geophysical Research.

Overview

PIRATA consists of a triangular arrangement of surface and subsurface moorings across the tropical Atlantic Basin, sampling key regions near the Equator (Earth), the Gulf of Guinea, and the Brazilian coast. The array integrates observations of sea surface temperature collected alongside surface fluxes measured for atmospheric coupling studies relevant to Intergovernmental Panel on Climate Change assessments and multicenter programs such as the World Climate Research Programme and Climate Variability and Predictability. PIRATA observations feed into global syntheses alongside data from projects like Argo (oceanography), TAO/TRITON, and ADCP deployments used by institutions such as Plymouth Marine Laboratory and National Centre for Atmospheric Research.

History and Development

Conceived in the 1990s through collaborations among France, United States, and Brazil, PIRATA emerged from planning meetings involving agencies like Institut Français, NOAA Atlantic Oceanographic and Meteorological Laboratory, and Brazilian research centers such as Instituto Oceanográfico. Early deployments drew on technologies refined by Tropical Atmosphere Ocean project, TOGA, and lessons from the Global Ocean Observing System. Milestones include phased expansion of the network, modernization of instrumentation in the 2000s, and multinational renewals coordinated at venues like the American Geophysical Union and European Geosciences Union assemblies. Key personnel and program managers have included scientists affiliated with CNRS, UPMC, University of São Paulo, and Woods Hole Oceanographic Institution.

Instrumentation and Moorings

Moorings combine surface buoys, subsurface sensors, meteorological packages, and current profilers supplied by vendors and laboratories including Nortek, Seabird Electronics, and Aanderaa. Standard sensor suites measure sea surface temperature with thermistor chains, salinity via conductivity sensors, pressure and wave parameters, and wind stress from anemometers; acoustic Doppler current profilers record velocity profiles utilized by researchers from Scripps Institution of Oceanography and Lamont–Doherty Earth Observatory. Mooring designs incorporate anchor systems and polypropylene or steel cable recognized by ocean engineers at IFREMER and Instituto Oceanográfico. Deployments have adapted remote telemetry through Iridium (satellite constellation) and satellite platforms run by NOAA and EUMETSAT for near–real-time transmission, enabling assimilation into forecast systems at ECMWF and NOAA/NCEP.

Scientific Objectives and Research Findings

Primary objectives include quantifying air-sea fluxes of heat and momentum, monitoring equatorial and basin-scale SST anomalies, and diagnosing upper-ocean processes such as equatorial Kelvin and Rossby waves studied by teams from University of Miami and University of Cape Town. PIRATA data have clarified roles of the Atlantic Niño, the Intertropical Convergence Zone, and the North Atlantic Oscillation in modulating seasonal rainfall over Sahel and precipitation over Northeastern Brazil. Findings published by investigators affiliated with CNRS, NOAA, USP, and Scripps have shown links between subsurface heat content variability and trans-basin teleconnections to the Pacific Ocean and Indian Ocean as well as contributions to seasonal hurricane forecasting used by National Hurricane Center and disaster agencies such as PAHO. Results inform coupled model improvements at centers like GFDL, ECMWF, and UK Met Office Hadley Centre.

Operations and Data Management

Field operations are conducted from research vessels including the R/V Pourquoi Pas?, R/V Atlantis (1996), RRS Discovery, and Brazilian ships such as Almirante Câmara with logistics coordinated by maritime authorities including French Navy and Brazilian Marinha do Brasil. Maintenance cruises occur on multi-year cycles; loss and recovery operations have required collaboration with agencies like NOAA Office of Marine and Aviation Operations and salvage teams. Data management follows protocols for quality control, metadata, and open access; datasets are archived at national repositories and integrated into portals maintained by NOAA National Centers for Environmental Information, SEANOE, and institutional databases at IFREMER and USP. Assimilation-ready PIRATA products support operational centers including NOAA/NCEP, IRI, and research consortia such as CLIVAR.

International Collaboration and Funding

The program is governed by bilateral and multilateral agreements among agencies from France, United States, Brazil, and partner countries including Portugal and South Africa. Funding streams derive from national research agencies like CNRS, CNPq, NSF, and programmatic budgets at NOAA and the French Ministry of Higher Education and Research. Scientific coordination occurs through working groups convened at meetings of WCRP, CLIVAR, and conferences such as the AGU Fall Meeting and EGU General Assembly. Capacity-building efforts have involved universities including University of São Paulo, Federal University of Ceará, University of Cape Town, and regional meteorological services such as INMET and Instituto de Meteorologia (Mozambique), strengthening long-term observational coverage and data use in climate services.

Category:Oceanographic projects Category:Climate networks