Global Temperature and Salinity Profile Programme

Global Temperature and Salinity Profile Programme
Name	Global Temperature and Salinity Profile Programme
Formation	1990
Purpose	To collect and manage a comprehensive database of ocean temperature and salinity profiles
Headquarters	NOAA/NCEI, USA
Region served	Global
Website	[https://www.nodc.noaa.gov/GTSPP/ Official Website]

Global Temperature and Salinity Profile Programme. It is an international cooperative project established to build a comprehensive, high-quality database of in situ ocean temperature and salinity measurements. The programme operates under the auspices of the Intergovernmental Oceanographic Commission and the World Meteorological Organization, serving as a foundational component of the Global Ocean Observing System. Its primary mission is to ensure the timely collection, quality control, and distribution of essential data for climate research, ocean forecasting, and operational oceanography.

Overview and Objectives

The core objective of the programme is to integrate real-time data and delayed-mode data from a vast array of global sources into a unified, accessible repository. This supports critical international efforts like the World Climate Research Programme and the Global Climate Observing System. Key goals include improving the quality and coverage of hydrographic data used in climate models and enhancing the understanding of ocean heat content and freshwater flux. By standardizing data formats and quality procedures, it provides a reliable benchmark for studies of phenomena such as El Niño-Southern Oscillation and long-term climate change.

Data Collection and Methodology

Data is sourced from a global fleet of platforms, including Argo floats, ship-based CTD casts, moored buoys like those in the TAO/TRITON array, and expendable bathythermographs deployed from volunteer observing ships. The programme implements a rigorous, multi-stage quality control process, adhering to standards set by the International Quality-controlled Ocean Database. Automated checks and expert manual review are used to flag suspect measurements. Data is transmitted in near-real-time via the Global Telecommunications System and integrated with historical archives from institutions like the National Oceanographic Data Center and the British Oceanographic Data Centre.

Key Components and Products

A central component is the Global Temperature and Salinity Profile Programme Real-Time Quality Controlled Database, which is updated daily. Key derived products include gridded climatologies of temperature anomalies and salinity anomalies, which are vital for initializing ocean circulation models. The programme also produces specialized datasets for calibrating satellite altimetry missions like Jason-3 and validating outputs from major projects such as the Coupled Model Intercomparison Project. These products are disseminated through partner data centers like Coriolis and the Integrated Science Data Management system.

Historical Development and Governance

The programme was formally initiated in 1990, evolving from earlier data management efforts by the Intergovernmental Oceanographic Commission and the United Nations Educational, Scientific and Cultural Organization. Its governance structure involves a steering group with representatives from leading agencies like NOAA, Fisheries and Oceans Canada, and the European Centre for Medium-Range Weather Forecasts. It works in close collaboration with the International Oceanographic Data and Information Exchange network. The advent of the Argo program in the early 2000s provided a transformative, autonomous data stream that greatly expanded the programme's spatial and temporal coverage.

Scientific Impact and Applications

The programme's data is fundamental to monitoring changes in global sea level and ocean acidification. It provides the essential in situ observations needed to assess the accuracy of reanalysis products like ERA5 and ORAS5. Research relying on this database has quantified accelerating ocean warming trends and shifting salinity patterns, contributing directly to assessment reports by the Intergovernmental Panel on Climate Change. The data is also operationally used by centers like the Naval Oceanographic Office and Météo-France for numerical weather prediction and hurricane intensity forecasting.

Challenges and Future Directions

Persistent challenges include maintaining global coverage, especially in remote regions like the Southern Ocean and under sea ice in the Arctic Ocean. Integrating new sensor technologies from platforms like Saildrone and Wave Glider into the quality control framework is an ongoing effort. Future directions focus on enhancing the integration of biogeochemical data from Bio-Argo floats and improving data assimilation for high-resolution models used by the Copernicus Marine Environment Monitoring Service. Ensuring long-term sustainability and interoperability with other global databases remains a priority for supporting the United Nations Decade of Ocean Science.

Category:Oceanography Category:Climate change assessment and attribution Category:Environmental data