The First Report of the Tropical Pacific Observing System (TPOS 2020) project was published on 30 December 2016. This report contains initial recommendations for the Backbone and a synopsis of initial results and plans for the various initiatives of TPOS 2020. The Executive Summary and the full First Report can be downloaded from the tpos2020.org website or from the GOOS Report site.

The Executive Summary is now available in Chinese, English, French, Japanese and Korean, and is being translated into Spanish. The Report contains a full list of authors, contributors and reviewers, as well as acknowledgements. The authors thank all who contributed to this Report.

The following recommendations from the Report might be of particular importance to the marine biogeochemistry, as taken from Chapter 5.7 - CO₂ flux, ocean color and biogeochemistry.

• Recommendation 12: Continuation of high-frequency, moored time series and broad spatial scale underway surface ocean pCO2 observations across the Pacific from 10°S to 10°N;
• Recommendation 13: Continuation of advocacy for ocean color satellite missions with appropriate overlap to facilitate intercalibration for measurement consistency. In situ measurements of chlorophyll-a and optical properties for the validation of satellite ocean color measurements are required; and
• Recommendation 14: From 10°S to 10°N, observations of subsurface biogeochemical properties are required, including chlorophyll concentration, particulate backscatter, oxygen and nutrients. Enhanced focus is needed for the eastern edge of the Warm Pool and the east Pacific cold tongue.

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