This List of Acronyms and other Abbreviations was compiled from the coral, coral reef, marine tropical ecosystems, and related peer-reviewed literature, grey literature, and other written and electronic reports, including e-mail messages. The terms on the list number nearly 3,600 (as of February 2010) and continue to grow on a daily to weekly basis. CoRIS invites readers to suggest additional acronyms and abbreviations via or

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Acronyms A - Z Pages

A | B | C | D | E | F | G | H | I | J | K | L | M
N | O | P | Q | R | S | T | U | V | W | X | Y | Z

O Oxygen
O&M Operations & Maintenance
O2crit Critical O2 Concentration
O3 Ozone
OA Ocean Acidification
OA-ISMAs Ocean Acidification Intensively Studied Marine Areas
OAAP Operations and Administration Action Plan
OAE Ocean Acidification Effect
OAE Open Access Equilibrium
OAIS Open Archival Information System (NOAA)
OAIS RM Open Archival Information System Reference Model
OAP National Ocean Acidification Program
OAP Ocean Action Plan (NOAA)
OAP Ocean Assessment Program (NOAA)
OAR Office of Oceanic and Atmospheric Research (NOAA)
OAS Organization of American States
OAS NODC's Ocean Archive System (NOAA)
OAS IDSD Organization of American States - Information for Decision-Making for Sustainable Development
OASIS OceAnic Seamounts: an Integrated Study
OAT Organic Anion Transporter
OATF Ocean Acidification Task Force
OATP Organic Anion Transporting Polypeptide
OBFS Organization of Biological Field Stations
OBIS Ocean Biogeographical Information System
OBL Overall Body Length
OBPG Ocean Biology Processing Group (NASA)
OC Organic Carbon
OCARIBE-GOOS Intergovernmental Oceanographic Commission - Sub-Commission for the Caribbean and Adjacent Regions – Global Ocean Observing System
OCB Ocean Carbon and Biogeochemistry
OCCG Ocean-Color Coordinating Group
OCCL Office of Conservation and Coastal Lands
OCD Ocean Chemistry Division (NOAA/AOML)
OCEAN Ocean Conservation Education Action Network (NOAA)
OceanSITES Ocean Sustained Interdisciplinary Time-series Environmental Observation System
OCG Ocean Circulation Group (CMS/USF)
OCLTT Oxygen and Capacity Limited Thermal Tolerance
OCM Ocean Color Monitor
OCM Ocean and Coastal Mapping (NOAA)
OCN Oficina del Comisionado de Navegación del Departamento de Recursos Naturales y Ambientales (Office of the Commissioner of Navigation, Department of Natural and Environmental Resources of Puerto Rico)
OCNMS Olympic Coast National Marine Sanctuary (NOAA)
OCO Orbiting Carbon Observatory
OCONUS Outside Continental United States
OCRM Office of Ocean and Coastal Resources Management (NOS/NOAA)
OCS Office of Coast Survey (NOAA-NOS)
OCS Outer Continental Shelf
OCSLA Outer Continental Shelf Lands Act
Oct Octocoral
OCT Organic Cation Transporter
OCTET Ocean Carbon Transport, Exchanges and Transformations
ODA Overseas Development Agency
ODA Official Development Assistance
ODAS Oceanic Data Assimilation System
ODBC Open DataBase Connectivity
ODC Operation Deep Climb
ODIN Ocean Data and Information Network
ODIN-PIMRIS Regional Network of Pacific Marine Libraries
ODINAFRICA Ocean Data and Information Network for Africa
ODINCINDIO Ocean Data and Information Network for the Central Indian Ocean
ODMDS Ocean Dredged Material Disposal Sites
ODMS Oceanographic Data Management System
ODP Ocean Data Platform
ODP Ocean Drilling Program
ODP Ocean Data Portal (IODE)
ODP Ozone Depletion Potential
ODPEM Office of Disaster Preparedness and Emergency Management (Jamaica)
ODS Ozone-Depleting Substance
ODTG Observational Data Task Group (GBIF)
ODU Old Dominion University
ODZ Oxygen Depleted Zone
OE Ocean Exploration
OEBGD Overseas Environmental Baseline Guidance Document
OECA Oculina Experimental Closed Area
OECD Organisation for Economic Cooperation and Development
OECS Organization of Eastern Caribbean States
OECS-ESDU Organization of Eastern Caribbean States – Environment and Sustainable Development Unit
OEd Office of Education (NOAA)
OEPPC Office of Environmental Planning and Policy Coordination (RMI)
OER Ocean Exploration and Research (NOAA)
OERC Office of Environmental Response and Coordination (Republic of Palau)
OFCM Office of the Federal Coordinator for Meteorology
OFES Ocean model For Earth Simulator
OFL Overfishing Limit
OFP Oceanic Fisheries Program (SCP)
OFP Orange Fluorescent Protein
OFR Our Florida Reefs
OGC Open Geospatial Consortium, Inc.®
OGC Office of General Council
OGCM Ocean General Circulation Model
OGIS Open GIS Consortium
OGPP On-Ground Project Programme
OGRe Organellar Genome Retrieval project
OHA Office of Hawaiian Affairs
OHC Office of Habitat Conservation NOAA)
OHD Office of Hydrologic Development (NOAA)
OHHB Oceans and Human Health Branch (NCCOS/NOAA)
OHHI NOAA Oceans and Human Health Initiative (NOAA)
OHS Oil and Hazardous Substance
OHS Office of Homeland Security
OIA Office of Insular Affairs
OIA Office of International Affairs
OIC Offshore Industry Committee (OSPAR)
OIF Ocean Iron fertilization
OIG Office of Inspector General
OIMB Oregon Institute of Marine Biology
OIP Ocean Inquiry Project
OIRC Offshore Islet Restoration Committee
OIS Oxygen Isotope Stage
OISS Offshore Island Seabird Sanctuaries
OLA Office of Legislative Affairs (NOAA)
OLE Office of Law Enforcement (NOAA)
OLISP Office of Long Island Sound Programs
OLO Our Living Oceans
OM Old Mortality
OMAO Office of Marine and Aviation Operations (NOAA)
OMB Office of Management and Budget
OMG Ocean Observing and Modeling Group (MEAS/NCSU)
OMI Operations Management and Information
OMPS Ozone Mapping and Profiler Suite
OMZ Oxygen Minimum Zone
ONMS Office of National Marine Sanctuaries (NOAA)
ONR Office of Naval Research (DOD)
ONRW Outstanding National Resource Waters
OOCRM Office of Ocean and Coastal Resource Management (NOS/NOAA)
OOCRM Object-Oriented Conceptual Reference Model
OOE Office of Ocean Exploration (NOAA)
OOI Ocean Observatories Initiative (NSF)
OOL Optical Oceanography Laboratory (CMS/USF)
OOPC Ocean Observations Panel for Climate
OOS Ocean Observing System
OPA Oil Pollution Act
OPAAL Organization of Eastern Caribbean States (OECS) Protected Areas and Associated Livelihoods Project
OPAH Oxygenated Polyaromatic Hydrocarbon
OPAs Otherwise Protected Areas
OPDB Operational Products Development Branch (NOAA)
OPEC Organization of Petroleum Exporting Countries
OPeNDAP Open-source Project for a Network Data Access Protocol
OPIS Ocean Planning Information System (NOAA) (formerly Ocean Planning and Governance Geographic Information System (Ocean GIS) for the southeast)
OPM Office of Personnel Management
OPPAGA Office of Program Policy Analysis and Government Accountability
OPR Office of Protected Resources (NOAA)
OPRC International Convention on Oil Pollution Preparedness, Response, and Cooperation
OPRC Oil Pollution Preparedness, Response and Cooperation
OPTF Ocean Policy Task Force (WH)
OPTI Reservoir Optimization Model
OPUS Online Positioning User Service (NOAA)
OR&R Office of Response and Restoration (NOAA)
ORA Office of Research and Applications (NOAA)
ORAD Oceanic Research and Applications Division (NOAA)
ORAP Ocean Research Advisory Panel
ORCA Office of Ocean Resources Conservation and Assessment (NOAA)
ORCA Ocean Research & Conservation Association
ORCA Orlando Reef Caretakers Association
ORD Office of Research and Development (EPA)
ORF Operations, Research and Facilities Account
ORF Open Reading Frame
ORF Oceanic Resource Foundation
ORI Oceanographic Research Institute (UKZN/SAAMBR)
ORI Open Rivers Initiative (NOAA)
ORION Ocean Research Interactive Observatory Networks
ORNIS Ornithological Information System
ORP Orinoco River Plume
ORP Oxidation-Reduction Potential
ORPP Ocean Research Priorities Plan
ORR Oculina Research Reserve (NOAA)
ORR Office of Response and Restoration (NOAA)
ORRAP Ocean Research and Resources Advisory Panel
ORS Ocean Remote Sensing
ORSTOM Office de Recherche Scientifique et Technologique d’Outre Mer
OS Oceanic Society
OSA Office of Samoan Affairs
OSC On-Scene Coordinator
OSCAR Ocean Surface Current Analyses – Real time (NOAA)
OSCURS Ocean Surface Current Simulations
OSDPD Office of Satellite Data Processing and Distribution (NOAA)
OSDS On-Site Disposal System
OSDS On-Site Disposal System
OSF Office of Sustainable Fisheries (NOAA)
OSHA Occupational Safety and Health Administration
OSIE Oceans Science Interoperability Experiment
OSLR Ocean Sciences and Living Resources (IOC)
OSM Oceanographic Society of Maldives
OSMC Observing System Monitoring Center (NOAA)
OSN Ocean Seismic Network
OSP Optimum Sustainable Population
OSPAR Convention for the Protection of the Marine Environment of the North-East Atlantic
OSPAR Oslo and Paris (as in OSPAR Convention)
OSPAR Commission for the Protection of the Marine Environment of the North-East Atlantic
OSPESCA Organización Sector Pesquero y Aquícola del Istmo Centroamericano (Organization of the Fisheries and Aquaculture Sector in Central America)
OSRI Oil Spill Recovery Institute
OSSEs Observing System Simulation Experiments
OST Office of Science and Technology (NOAA)
OST-ST Ocean Surface Topography-Science Team 
OSTM Ocean Surface Topography Mission
OSTP Office of Science and Technology Policy
OT Others
OTDPS Oracle Turtle Data Processing System
OTE Ocean Thermal Energy Conversion
OTEC Ocean Thermal Energy Conversion
OTEP Overseas Territories Environment Programme
OTM Ongeim’l Tketau (Palauan name for Jellyfish Lake)
OTN Canadian Global Ocean Ocean Tracking Network
OTs Overseas Territories (UK)
OTSB Semi-Balloon Otter Trawl
OTU Operational Taxonomic Unit
OU Operating Unit
OUCH Order of Underwater Coral Heros
OUP Oxford University Press
OW Oceanwatch
OW Ocean Watch (Bahamas)
OW     Open Water
OWDIP Ocean Wave Data and Information Portal (NOAA)
OWS Ocean Weather Station
OWSI Open Water SCUBA Instructor
OY Optimum Yield
OZCAM Online Zoological Collections of Australian Museums