The Global Ocean Data Analysis Project version 2 (GLODAPv2) – an internally
consistent data product for the world ocean

Olsen, Are; Key, Robert M.; Heuven, Steven van; Lauvset, Siv K.; Velo, A.; Lin, Xia; Schirnick, Carsten; Kozyr, Alex; Tanhua, Toste; Hoppema, Mario; Jütterström, Sara; Steinfeldt, Reiner; Jeansson, Emil; Ishii, Masayoshi; Pérez, Fíz F.; Suzuki, T.

doi:10.5194/essd-8-297-2016

Cited by 504 publications

(656 citation statements)

References 52 publications

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“…At the basin scale, the analysis from the recent GLODAPv2 dataset (Olsen et al 2016 Ocean and, unlike in the Atlantic Ocean, nomenclature, formation processes, circulation and mixing of water masses are still subject to debate and make interpretation from N* signal at regional scale yet difficult. Further work is required to explore differents unsolved points.…”

Section: Resultsmentioning

confidence: 99%

“…Previous databases, WOCE/JGOFS combined in additional cruises were grouped together and have undergone one and only high-quality control, based on two steps (primary and secondary QC) applied to each data. The GLODAPv2 database is available at http://cdiac.ornl.gov/oceans/GLODAPv2/ and the details of the overall production strategy are explained in Olsen et al (2016). The GLODAPv2 database includes samples of core variables such as salinity, oxygen, macronutrients, and seawater CO2 chemistry from 724 oceanic cruises.…”

Section: Glodapv2 Databasementioning

confidence: 99%

“…The Global Ocean Data Analysis Project version 2 (GLODAPv2) is an international effort to consolidate all data from ocean bottle samples collected as part of many oceanic cruises (Olsen et al, 2016). Previous databases, WOCE/JGOFS combined in additional cruises were grouped together and have undergone one and only high-quality control, based on two steps (primary and secondary QC) applied to each data.…”

Section: Glodapv2 Databasementioning

confidence: 99%

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Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

Fumenia

Moutin

Bonnet

et al. 2018

Preprint

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Abstract. As part of the Oligotrophy to UlTra-oligotrophy PACific Experiment cruise, which took place in the Western 15Tropical South Pacific during the austral summer (March-April 2015), we present data on nitrate, phosphate and on particulate and dissolved organic matter. The stoichiometric nitrogen-to-phosphorus ratios of the inorganic and organic material and the tracer N* are described. N* allows to trace changes in the proportion of fixed nitrogen due to diazotrophy and/or denitrification.Our results showed that the Melanesian archipelago waters between 160° E and 170° W are characterized by a deficit of nitrate and phosphate in the productive layer, significant dinitrogen fixation rates and an excess of particulate organic nitrogen 20 compared to the canonical ratio of Redfield. A positive N* anomaly was observed in the productive layer reflecting the combined effect of phosphate uptake by diazotrophic organisms and remineralization of excess particulate organic nitrogen.The South Pacific Gyre waters between 170° W and 160° W were depleted in nitrate but rich in phosphate. Surface waters exhibited very low dinitrogen fixation rates, an absence of excess particulate organic nitrogen and a N* signal close to zero.The higher iron availability coupled with an absence of nitrate in the suface water of the Melanesian archipelago could 25 stimulate the diazotrophic activity, which in turn will introduce excess nitrogen, deplete the surface waters in phosphate and be the explanation for the positive N* anomaly in the Melanesian archipelago waters. In the thermocline waters, the N* tracer revealed its full complexity, with notably the cumulative effect of the remineralization of particulate organic nitrogen and the

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Section: Resultsmentioning

confidence: 99%

Section: Glodapv2 Databasementioning

confidence: 99%

Section: Glodapv2 Databasementioning

confidence: 99%

See 1 more Smart Citation

Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

Fumenia

Moutin

Bonnet

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…Comparison of model results and performance with existing and emerging observations, data products and technology (e.g., new GLODAPv2 (Global Ocean Data Analysis Project Version 2), satellite products for chlorophyll, primary production, data from the Southern Ocean Continuous Plankton Recorder and Southern Ocean Observing System, FISH-MIP (Fisheries and Marine Ecosystem Model Intercomparison Project) and others (Rintoul et al, 2012;Constable et al, 2016;Olsen et al, 2016) will be an essential aspect of future work. In addition, more research is needed on the mechanisms that link the physical variables to ecological processes.…”

Section: Future Workmentioning

confidence: 99%

A Synergistic Approach for Evaluating Climate Model Output for Ecological Applications

et al. 2017

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Increasing concern about the impacts of climate change on ecosystems is prompting ecologists and ecosystem managers to seek reliable projections of physical drivers of change. The use of global climate models in ecology is growing, although drawing ecologically meaningful conclusions can be problematic. The expertise required to access and interpret output from climate and earth system models is hampering progress in utilizing them most effectively to determine the wider implications of climate change. To address this issue, we present a joint approach between climate scientists and ecologists that explores key challenges and opportunities for progress. As an exemplar, our focus is the Southern Ocean, notable for significant change with global implications, and on sea ice, given its crucial role in this dynamic ecosystem. We combined perspectives to evaluate the representation of sea ice in global climate models. With an emphasis on ecologically-relevant criteria (sea ice extent and seasonality) we selected a subset of eight models that reliably reproduce extant sea ice distributions. While the model subset shows a similar mean change to the full ensemble in sea ice extent (approximately 50% decline in winter and 30% decline in summer), there is a marked reduction in the range. This improved the precision of projected future sea ice distributions by approximately one third, and means they are more amenable to ecological interpretation. We conclude that careful multidisciplinary evaluation of climate models, in conjunction with ongoing modeling advances, should form an integral part of utilizing model output.

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“…Biogeochemical change in the water masses of the Southern Ocean, south of Tasmania, was assessed for the 16-year period between 1995 and 2011 using data from four summer repeats of the WOCE-JGOFS-CLIVAR-GO-SHIP (Key et al, 2015;Olsen et al, 2016) SR03 hydrographic section (at ∼ 140 • E). Changes in temperature, salinity, oxygen, and nutrients were used to disentangle the effect of solubility, biology, circulation and anthropogenic carbon (C ANT ) uptake on the variability of dissolved inorganic carbon (DIC) for eight water mass layers defined by neutral surfaces (γ n ).…”

mentioning

confidence: 99%

Carbon uptake and biogeochemical change in the Southern Ocean, south of Tasmania

et al. 2017

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Abstract. Biogeochemical change in the water masses of the Southern Ocean, south of Tasmania, was assessed for the 16-year period between 1995 and 2011 using data from four summer repeats of the WOCE-JGOFS-CLIVAR-GO-SHIP (Key et al., 2015;Olsen et al., 2016) SR03 hydrographic section (at ∼ 140 • E). Changes in temperature, salinity, oxygen, and nutrients were used to disentangle the effect of solubility, biology, circulation and anthropogenic carbon (C ANT ) uptake on the variability of dissolved inorganic carbon (DIC) for eight water mass layers defined by neutral surfaces (γ n ). C ANT was estimated using an improved back-calculation method. Warming (∼ 0.0352 ± 0.0170 • C yr −1 ) of Subtropical Central Water (STCW) and Antarctic Surface Water (AASW) layers decreased their gas solubility, and accordingly DIC concentrations increased less rapidly than expected from equilibration with rising atmospheric CO 2 (∼ 0.86 ± 0.16 µmol kg −1 yr −1 versus ∼ 1 ± 0.12 µmol kg −1 yr −1 ). An increase in apparent oxygen utilisation (AOU) occurred in these layers due to either remineralisation of organic matter or intensification of upwelling. The range of estimates for the increases in C ANT were 0.71 ± 0.08 to 0.93 ± 0.08 µmol kg −1 yr −1 for STCW and 0.35 ± 0.14 to 0.65 ± 0.21 µmol kg −1 yr −1 for AASW, with the lower values in each water mass obtained by assigning all the AOU change to remineralisation. DIC increases in the Sub-Antarctic Mode Water (SAMW, 1.10 ± 0.14 µmol kg −1 yr −1 ) and Antarctic Intermediate Water (AAIW, 0.40 ± 0.15 µmol kg −1 yr −1 ) layers were similar to the calculated C ANT trends. For SAMW, the C ANT increase tracked rising atmospheric CO 2 . As a consequence of the general DIC increase, decreases in total pH (pH T ) and aragonite saturation ( Ar ) were found in most water masses, with the upper ocean and the SAMW layer presenting the largest trends for pH T decrease (∼ −0.0031 ± 0.0004 yr −1 ). DIC increases in deep and bottom layers (∼ 0.24 ± 0.04 µmol kg −1 yr −1 ) resulted from the advection of old deep waters to resupply increased upwelling, as corroborated by increasing silicate (∼ 0.21 ± 0.07 µmol kg −1 yr −1 ), which also reached the upper layers near the Antarctic Divergence (∼ 0.36 ± 0.06 µmol kg −1 yr −1 ) and was accompanied by an increase in salinity. The observed changes in DIC over the 16-year span caused a shoaling (∼ 340 m) of the aragonite saturation depth (ASD, Ar = 1) within Upper Circumpolar Deep Water that followed the upwelling path of this layer. From all our results, we conclude a scenario of increased transport of deep waters into the section and enhanced upwelling at high latitudes for the period between 1995 and 2011 linked to strong westerly winds. Although enhanced upwelling lowered the capacity of the AASW layer to uptake atmospheric CO 2 , it did not limit that of the newly forming SAMW and AAIW, which exhibited C ANT storage rates (∼ 0.41 ± 0.20 mol m −2 yr −1 ) twice that of the upper layers.

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The Global Ocean Data Analysis Project version 2 (GLODAPv2) – an internally consistent data product for the world ocean

Cited by 504 publications

References 52 publications

Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

A Synergistic Approach for Evaluating Climate Model Output for Ecological Applications

Carbon uptake and biogeochemical change in the Southern Ocean, south of Tasmania

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