We are pleased to inform you that the Global Carbon Project (GCP) has published an updated and expanded Global Methane Budget. For the decade of 2008-2017, global emissions of methane are 576 (550-594) Tg CH₄ per year as estimated from atmospheric inversions (top-down approach). The global CH₄ sink is 556 Tg (501-574) CH₄ per year. The source–sink mismatch reflects, and is consistent with, the observed average imbalance in the atmosphere of 13 Tg (0-49) CH₄ per year (the CH₄ growth rate). The sum of all sources as estimated from inventories and modeling (bottom-up approaches) is 737 (594-880) Tg CH₄, significantly higher than estimated from the top-down approach and reflecting the compounded uncertainties of the multiple CH₄ sources.

The effort was supported by 91 contributors and 69 research organizations. Please find papers, data and additional resources at: https://www.globalcarbonproject.org/methanebudget 

On behalf of the GLODAP Reference Group, and hundreds of seagoing oceanographers that tirelessly have collected data all over the ocean, we are happy to announce the publication of GLODAPv2.2020.

The Global Ocean Data Analysis Project (GLODAP) data product provides access to quality controlled surface to bottom ocean biogeochemical data, with an emphasis on seawater inorganic carbon. GLODAPv2.2020 is an update of the previous version, with 106 additional cruises, extension of time coverage until 2019, and the inclusion of available discrete fCO₂ values in the merged product files. GLODAPv2.2020 includes measurements from more than 1.2 million water samples from the global ocean collected on 946 cruises. The data for the 12 core variables have undergone extensive quality control, especially systematic evaluation of bias. The data are available in two formats: (i) as submitted by the data originator but updated to WOCE exchange format and (ii) as a merged data product with adjustments applied to minimize bias. The original data, their documentation and doi codes are available at the Ocean Carbon Data System (OCADS) of NOAA NCEI. This site also provides access to the merged data product, which is provided as a single global file and as four regional ones. For a more detailed summary of the product see the attached poster. 

The continuous work to regularly update and refine GLODAP is a priority for IOCCP, and we are happy to support this effort. 

On behalf more than 100 contributing scientists worldwide, we proudly announce the release of 2020 version of the Surface Ocean CO₂ Atlas (SOCAT, www.socat.info) which is a synthesis activity with annual public releases prepared by international marine carbon scientists. SOCAT version 2020 contains 28.2 million in situ surface ocean fCO₂ (fugacity of CO₂) measurements for the global ocean and coastal seas with an accuracy < 5 μatm, while a further 2.3 million fCO₂ values with an accuracy of 5 to 10 μatm are made available separately. SOCAT documents the increase in surface ocean CO₂ (carbon dioxide), a critical measure as the oceans are taking up one quarter of the global CO₂ emissions from human activity.

The SOCAT community-led synthesis product is a key step in the value chain based on in situ inorganic carbon measurements of the oceans, which provides policy makers with essential information on ocean CO₂ uptake in climate negotiations. The global need for accurate knowledge of ocean CO₂ uptake and its variation makes sustained funding for in situ surface ocean CO₂ observations imperative. The annual SOCAT release is a Voluntary Commitment for SDG 14.3 (#OceanAction20464) and contributes to the UN Decade of Ocean Science for Sustainable Development. The poster handout has further details on 2020 version key features, findings and other information, including timeline for preparing the 2021 version.