Abstract
Abstract. We present a mapped climatology (GLODAPv2.2016b) of ocean biogeochemical variables based on the new GLODAP version 2 data product (Olsen et al., 2016; Key et al., 2015), which covers all ocean basins over the years 1972 to 2013. The quality-controlled and internally consistent GLODAPv2 was used to create global 1° × 1° mapped climatologies of salinity, temperature, oxygen, nitrate, phosphate, silicate, total dissolved inorganic carbon (TCO2), total alkalinity (TAlk), pH, and CaCO3 saturation states using the Data-Interpolating Variational Analysis (DIVA) mapping method. Improving on maps based on an earlier but similar dataset, GLODAPv1.1, this climatology also covers the Arctic Ocean. Climatologies were created for 33 standard depth surfaces. The conceivably confounding temporal trends in TCO2 and pH due to anthropogenic influence were removed prior to mapping by normalizing these data to the year 2002 using first-order calculations of anthropogenic carbon accumulation rates. We additionally provide maps of accumulated anthropogenic carbon in the year 2002 and of preindustrial TCO2. For all parameters, all data from the full 1972–2013 period were used, including data that did not receive full secondary quality control. The GLODAPv2.2016b global 1° × 1° mapped climatologies, including error fields and ancillary information, are available at the GLODAPv2 web page at the Carbon Dioxide Information Analysis Center (CDIAC; doi:10.3334/CDIAC/OTG.NDP093_GLODAPv2).
Highlights
Obtaining accurate estimates of recent changes in the ocean carbon cycle, including how these changes will influence climate, requires the availability of high-quality data
We present a mapped climatology (GLODAPv2.2016b) of ocean biogeochemical variables based on the new GLODAP version 2 data product (Olsen et al, 2016; Key et al, 2015), which covers all ocean basins over the years 1972 to 2013
Many more seawater CO2 chemistry data have been collected on research cruises after 1999, within the framework of the global repeat hydrography program CLIVAR/GO-SHIP (Feely et al, 2014; Talley et al, 2016), so that significantly more interior ocean carbon data exist today than were available in 2004
Summary
Obtaining accurate estimates of recent changes in the ocean carbon cycle, including how these changes will influence climate, requires the availability of high-quality data. In response to the shortcomings of GLODAPv1.1 in terms of data coverage and quality control of historical data, and to include more recent data, an updated and expanded version has been developed: GLODAPv2.2016 (Key et al, 2015; Olsen et al, 2016; see Appendix A for a note on naming of the data products). This new data product combines GLODAPv1.1 with data from the two recent regional synthesis products: CARbon dioxide IN the Atlantic Ocean (CARINA; Key et al, 2010), and PACIFic ocean Interior CArbon (PACIFICA; Suzuki et al, 2013). Most of the information regarding method and input data is, identical and the main differences between the versions are provided in Appendix A
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