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  • 2010-2014  (14)
  • 1
    Online-Ressource
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    Surface Ocean CO〈sub〉2〈/sub〉 Atlas (SOCAT) gridded data products
    Copernicus GmbH ; 2013
    In:  Earth System Science Data Vol. 5, No. 1 ( 2013-04-04), p. 145-153
    Details
    In: Earth System Science Data, Copernicus GmbH, Vol. 5, No. 1 ( 2013-04-04), p. 145-153
    Kurzfassung: Abstract. As a response to public demand for a well-documented, quality controlled, publically available, global surface ocean carbon dioxide (CO2) data set, the international marine carbon science community developed the Surface Ocean CO2 Atlas (SOCAT). The first SOCAT product is a collection of 6.3 million quality controlled surface CO2 data from the global oceans and coastal seas, spanning four decades (1968–2007). The SOCAT gridded data presented here is the second data product to come from the SOCAT project. Recognizing that some groups may have trouble working with millions of measurements, the SOCAT gridded product was generated to provide a robust, regularly spaced CO2 fugacity (fCO2) product with minimal spatial and temporal interpolation, which should be easier to work with for many applications. Gridded SOCAT is rich with information that has not been fully explored yet (e.g., regional differences in the seasonal cycles), but also contains biases and limitations that the user needs to recognize and address (e.g., local influences on values in some coastal regions).
    Materialart: Online-Ressource
    ISSN: 1866-3516
    URL: Article
    DOI: 10.5194/essd-5-145-2013
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2475469-9
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  • 2
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    A uniform, quality controlled Surface Ocean CO〈sub〉2〈/sub〉 Atlas (SOCAT)
    Copernicus GmbH ; 2013
    In:  Earth System Science Data Vol. 5, No. 1 ( 2013-04-04), p. 125-143
    Details
    In: Earth System Science Data, Copernicus GmbH, Vol. 5, No. 1 ( 2013-04-04), p. 125-143
    Kurzfassung: Abstract. A well-documented, publicly available, global data set of surface ocean carbon dioxide (CO2) parameters has been called for by international groups for nearly two decades. The Surface Ocean CO2 Atlas (SOCAT) project was initiated by the international marine carbon science community in 2007 with the aim of providing a comprehensive, publicly available, regularly updated, global data set of marine surface CO2, which had been subject to quality control (QC). Many additional CO2 data, not yet made public via the Carbon Dioxide Information Analysis Center (CDIAC), were retrieved from data originators, public websites and other data centres. All data were put in a uniform format following a strict protocol. Quality control was carried out according to clearly defined criteria. Regional specialists performed the quality control, using state-of-the-art web-based tools, specially developed for accomplishing this global team effort. SOCAT version 1.5 was made public in September 2011 and holds 6.3 million quality controlled surface CO2 data points from the global oceans and coastal seas, spanning four decades (1968–2007). Three types of data products are available: individual cruise files, a merged complete data set and gridded products. With the rapid expansion of marine CO2 data collection and the importance of quantifying net global oceanic CO2 uptake and its changes, sustained data synthesis and data access are priorities.
    Materialart: Online-Ressource
    ISSN: 1866-3516
    URL: Article
    DOI: 10.5194/essd-5-125-2013
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2475469-9
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  • 3
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    Temporal biomass dynamics of an Arctic plankton bloom in response to increasing levels of atmospheric carbon dioxide
    Copernicus GmbH ; 2013
    In:  Biogeosciences Vol. 10, No. 1 ( 2013-01-11), p. 161-180
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 10, No. 1 ( 2013-01-11), p. 161-180
    Kurzfassung: Abstract. Ocean acidification and carbonation, driven by anthropogenic emissions of carbon dioxide (CO2), have been shown to affect a variety of marine organisms and are likely to change ecosystem functioning. High latitudes, especially the Arctic, will be the first to encounter profound changes in carbonate chemistry speciation at a large scale, namely the under-saturation of surface waters with respect to aragonite, a calcium carbonate polymorph produced by several organisms in this region. During a CO2 perturbation study in Kongsfjorden on the west coast of Spitsbergen (Norway), in the framework of the EU-funded project EPOCA, the temporal dynamics of a plankton bloom was followed in nine mesocosms, manipulated for CO2 levels ranging initially from about 185 to 1420 μatm. Dissolved inorganic nutrients were added halfway through the experiment. Autotrophic biomass, as identified by chlorophyll a standing stocks (Chl a), peaked three times in all mesocosms. However, while absolute Chl a concentrations were similar in all mesocosms during the first phase of the experiment, higher autotrophic biomass was measured as high in comparison to low CO2 during the second phase, right after dissolved inorganic nutrient addition. This trend then reversed in the third phase. There were several statistically significant CO2 effects on a variety of parameters measured in certain phases, such as nutrient utilization, standing stocks of particulate organic matter, and phytoplankton species composition. Interestingly, CO2 effects developed slowly but steadily, becoming more and more statistically significant with time. The observed CO2-related shifts in nutrient flow into different phytoplankton groups (mainly dinoflagellates, prasinophytes and haptophytes) could have consequences for future organic matter flow to higher trophic levels and export production, with consequences for ecosystem productivity and atmospheric CO2.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    URL: Article
    DOI: 10.5194/bg-10-161-2013
    DOI: 10.5194/bg-10-161-2013-supplement
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2158181-2
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  • 4
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    Implications of elevated CO〈sub〉2〈/sub〉 on pelagic carbon fluxes in an Arctic mesocosm study – an elemental mass balance approach
    Copernicus GmbH ; 2013
    In:  Biogeosciences Vol. 10, No. 5 ( 2013-05-08), p. 3109-3125
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 10, No. 5 ( 2013-05-08), p. 3109-3125
    Kurzfassung: Abstract. Recent studies on the impacts of ocean acidification on pelagic communities have identified changes in carbon to nutrient dynamics with related shifts in elemental stoichiometry. In principle, mesocosm experiments provide the opportunity of determining temporal dynamics of all relevant carbon and nutrient pools and, thus, calculating elemental budgets. In practice, attempts to budget mesocosm enclosures are often hampered by uncertainties in some of the measured pools and fluxes, in particular due to uncertainties in constraining air–sea gas exchange, particle sinking, and wall growth. In an Arctic mesocosm study on ocean acidification applying KOSMOS (Kiel Off-Shore Mesocosms for future Ocean Simulation), all relevant element pools and fluxes of carbon, nitrogen and phosphorus were measured, using an improved experimental design intended to narrow down the mentioned uncertainties. Water-column concentrations of particulate and dissolved organic and inorganic matter were determined daily. New approaches for quantitative estimates of material sinking to the bottom of the mesocosms and gas exchange in 48 h temporal resolution as well as estimates of wall growth were developed to close the gaps in element budgets. However, losses elements from the budgets into a sum of insufficiently determined pools were detected, and are principally unavoidable in mesocosm investigation. The comparison of variability patterns of all single measured datasets revealed analytic precision to be the main issue in determination of budgets. Uncertainties in dissolved organic carbon (DOC), nitrogen (DON) and particulate organic phosphorus (POP) were much higher than the summed error in determination of the same elements in all other pools. With estimates provided for all other major elemental pools, mass balance calculations could be used to infer the temporal development of DOC, DON and POP pools. Future elevated pCO2 was found to enhance net autotrophic community carbon uptake in two of the three experimental phases but did not significantly affect particle elemental composition. Enhanced carbon consumption appears to result in accumulation of dissolved organic carbon under nutrient-recycling summer conditions. This carbon over-consumption effect becomes evident from mass balance calculations, but was too small to be resolved by direct measurements of dissolved organic matter. Faster nutrient uptake by comparatively small algae at high CO2 after nutrient addition resulted in reduced production rates under future ocean CO2 conditions at the end of the experiment. This CO2 mediated shift towards smaller phytoplankton and enhanced cycling of dissolved matter restricted the development of larger phytoplankton, thus pushing the system towards a retention type food chain with overall negative effects on export potential.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-10-3109-2013
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2158181-2
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  • 5
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    Pelagic community production and carbon-nutrient stoichiometry under variable ocean acidification in an Arctic fjord
    Copernicus GmbH ; 2013
    In:  Biogeosciences Vol. 10, No. 7 ( 2013-07-17), p. 4847-4859
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 10, No. 7 ( 2013-07-17), p. 4847-4859
    Kurzfassung: Abstract. Net community production (NCP) and carbon to nutrient uptake ratios were studied during a large-scale mesocosm experiment on ocean acidification in Kongsfjorden, western Svalbard, during June–July 2010. Nutrient depleted fjord water with natural plankton assemblages, enclosed in nine mesocosms of ~ 50 m3 in volume, was exposed to pCO2 levels ranging initially from 185 to 1420 μatm. NCP estimations are the cumulative change in dissolved inorganic carbon concentrations after accounting for gas exchange and total alkalinity variations. Stoichiometric coupling between inorganic carbon and nutrient net uptake is shown as a ratio of NCP to a cumulative change in inorganic nutrients. Phytoplankton growth was stimulated by nutrient addition half way through the experiment and three distinct peaks in chlorophyll a concentration were observed during the experiment. Accordingly, the experiment was divided in three phases. Cumulative NCP was similar in all mesocosms over the duration of the experiment. However, in phases I and II, NCP was higher and in phase III lower at elevated pCO2. Due to relatively low inorganic nutrient concentration in phase I, C : N and C : P uptake ratios were calculated only for the period after nutrient addition (phase II and phase III). For the total post-nutrient period (phase II + phase III) ratios were close to Redfield, however they were lower in phase II and higher in phase III. Variability of NCP, C : N and C : P uptake ratios in different phases reflects the effect of increasing CO2 on phytoplankton community composition and succession. The phytoplankton community was composed predominantly of haptophytes in phase I, prasinophytes, dinoflagellates, and cryptophytes in phase II, and haptophytes, prasinophytes, dinoflagellates and chlorophytes in phase III (Schulz et al., 2013). Increasing ambient inorganic carbon concentrations have also been shown to promote primary production and carbon assimilation. For this study, it is clear that the pelagic ecosystem response to increasing CO2 is more complex than that represented in previous work, e.g. Bellerby et al. (2008). Carbon and nutrient uptake representation in models should, where possible, be more focused on individual plankton functional types as applying a single stoichiometry to a biogeochemical model with regard to the effect of increasing pCO2 may not always be optimal. The phase variability in NCP and stoichiometry may be better understood if CO2 sensitivities of the plankton's functional type biogeochemical uptake kinetics and trophic interactions are better constrained.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-10-4847-2013
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2158181-2
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  • 6
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    Heterogeneity of impacts of high CO〈sub〉2〈/sub〉 on the North Western European Shelf
    Copernicus GmbH ; 2014
    In:  Biogeosciences Vol. 11, No. 3 ( 2014-02-03), p. 601-612
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 11, No. 3 ( 2014-02-03), p. 601-612
    Kurzfassung: Abstract. The increase in atmospheric CO2 is a dual threat to the marine environment: from one side it drives climate change, leading to modifications in water temperature, circulation patterns and stratification intensity; on the other side it causes a decrease in marine pH (ocean acidification, or OA) due to the increase in dissolved CO2. Assessing the combined impact of climate change and OA on marine ecosystems is a challenging task. The response of the ecosystem to a single driver can be highly variable and remains still uncertain; additionally the interaction between these can be either synergistic or antagonistic. In this work we use the coupled oceanographic–ecosystem model POLCOMS-ERSEM driven by climate forcing to study the interaction between climate change and OA. We focus in particular on carbonate chemistry, primary and secondary production. The model has been run in three different configurations in order to assess separately the impacts of climate change on net primary production and of OA on the carbonate chemistry, which have been strongly supported by scientific literature, from the impact of biological feedbacks of OA on the ecosystem, whose uncertainty still has to be well constrained. The global mean of the projected decrease of pH at the end of the century is about 0.27 pH units, but the model shows significant interaction among the drivers and high variability in the temporal and spatial response. As a result of this high variability, critical tipping point can be locally and/or temporally reached: e.g. undersaturation with respect to aragonite is projected to occur in the deeper part of the central North Sea during summer. Impacts of climate change and of OA on primary and secondary production may have similar magnitude, compensating in some area and exacerbating in others.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-11-601-2014
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2014
    ZDB Id: 2158181-2
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  • 7
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    Response of halocarbons to ocean acidification in the Arctic
    Copernicus GmbH ; 2013
    In:  Biogeosciences Vol. 10, No. 4 ( 2013-04-08), p. 2331-2345
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 10, No. 4 ( 2013-04-08), p. 2331-2345
    Kurzfassung: Abstract. The potential effect of ocean acidification (OA) on seawater halocarbons in the Arctic was investigated during a mesocosm experiment in Spitsbergen in June–July 2010. Over a period of 5 weeks, natural phytoplankton communities in nine ~ 50 m3 mesocosms were studied under a range of pCO2 treatments from ~ 185 μatm to ~ 1420 μatm. In general, the response of halocarbons to pCO2 was subtle, or undetectable. A large number of significant correlations with a range of biological parameters (chlorophyll a, microbial plankton community, phytoplankton pigments) were identified, indicating a biological control on the concentrations of halocarbons within the mesocosms. The temporal dynamics of iodomethane (CH3I) alluded to active turnover of this halocarbon in the mesocosms and strong significant correlations with biological parameters suggested a biological source. However, despite a pCO2 effect on various components of the plankton community, and a strong association between CH3I and biological parameters, no effect of pCO2 was seen in CH3I. Diiodomethane (CH2I2) displayed a number of strong relationships with biological parameters. Furthermore, the concentrations, the rate of net production and the sea-to-air flux of CH2I2 showed a significant positive response to pCO2. There was no clear effect of pCO2 on bromocarbon concentrations or dynamics. However, periods of significant net loss of bromoform (CHBr3) were found to be concentration-dependent, and closely correlated with total bacteria, suggesting a degree of biological consumption of this halocarbon in Arctic waters. Although the effects of OA on halocarbon concentrations were marginal, this study provides invaluable information on the production and cycling of halocarbons in a region of the world's oceans likely to experience rapid environmental change in the coming decades.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-10-2331-2013
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2158181-2
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  • 8
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    Contrasting responses of DMS and DMSP to ocean acidification in Arctic waters
    Copernicus GmbH ; 2013
    In:  Biogeosciences Vol. 10, No. 3 ( 2013-03-20), p. 1893-1908
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 10, No. 3 ( 2013-03-20), p. 1893-1908
    Kurzfassung: Abstract. Increasing atmospheric CO2 is decreasing ocean pH most rapidly in colder regions such as the Arctic. As a component of the EPOCA (European Project on Ocean Acidification) pelagic mesocosm experiment off Spitzbergen in 2010, we examined the consequences of decreased pH and increased pCO2 on the concentrations of dimethylsulphide (DMS). DMS is an important reactant and contributor to aerosol formation and growth in the Arctic troposphere. In the nine mesocosms with initial pHT 8.3 to 7.5, equivalent to pCO2 of 180 to 1420 μatm, highly significant but inverse responses to acidity (hydrogen ion concentration [H+]) occurred following nutrient addition. Compared to ambient [H+], average concentrations of DMS during the mid-phase of the 30 d experiment, when the influence of altered acidity was unambiguous, were reduced by approximately 60% at the highest [H+] and by 35% at [H+] equivalent to 750 μatm pCO2, as projected for 2100. In contrast, concentrations of dimethylsulphoniopropionate (DMSP), the precursor of DMS, were elevated by approximately 50% at the highest [H+] and by 30% at [H+] corresponding to 750 μatm pCO2. Measurements of the specific rate of synthesis of DMSP by phytoplankton indicate increased production at high [H+], in parallel to rates of inorganic carbon fixation. The elevated DMSP production at high [H+] was largely a consequence of increased dinoflagellate biomass and in particular, the increased abundance of the species Heterocapsa rotundata. We discuss both phytoplankton and bacterial processes that may explain the reduced ratios of DMS:DMSPt (total dimethylsulphoniopropionate) at higher [H+]. The experimental design of eight treatment levels provides comparatively robust empirical relationships of DMS and DMSP concentration, DMSP production and dinoflagellate biomass versus [H+] in Arctic waters.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-10-1893-2013
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2013
    ZDB Id: 2158181-2
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  • 9
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    Phytoplankton-bacteria coupling under elevated CO〈sub〉2〈/sub〉 levels: a stable isotope labelling study
    Copernicus GmbH ; 2010
    In:  Biogeosciences Vol. 7, No. 11 ( 2010-11-24), p. 3783-3797
    Details
    In: Biogeosciences, Copernicus GmbH, Vol. 7, No. 11 ( 2010-11-24), p. 3783-3797
    Kurzfassung: Abstract. The potential impact of rising carbon dioxide (CO2) on carbon transfer from phytoplankton to bacteria was investigated during the 2005 PeECE III mesocosm study in Bergen, Norway. Sets of mesocosms, in which a phytoplankton bloom was induced by nutrient addition, were incubated under 1× (~350 μatm), 2× (~700 μatm), and 3× present day CO2 (~1050 μatm) initial seawater and sustained atmospheric CO2 levels for 3 weeks. 13C labelled bicarbonate was added to all mesocosms to follow the transfer of carbon from dissolved inorganic carbon (DIC) into phytoplankton and subsequently heterotrophic bacteria, and settling particles. Isotope ratios of polar-lipid-derived fatty acids (PLFA) were used to infer the biomass and production of phytoplankton and bacteria. Phytoplankton PLFA were enriched within one day after label addition, whilst it took another 3 days before bacteria showed substantial enrichment. Group-specific primary production measurements revealed that coccolithophores showed higher primary production than green algae and diatoms. Elevated CO2 had a significant positive effect on post-bloom biomass of green algae, diatoms, and bacteria. A simple model based on measured isotope ratios of phytoplankton and bacteria revealed that CO2 had no significant effect on the carbon transfer efficiency from phytoplankton to bacteria during the bloom. There was no indication of CO2 effects on enhanced settling based on isotope mixing models during the phytoplankton bloom, but this could not be determined in the post-bloom phase. Our results suggest that CO2 effects are most pronounced in the post-bloom phase, under nutrient limitation.
    Materialart: Online-Ressource
    ISSN: 1726-4189
    URL: Article
    DOI: 10.5194/bg-7-3783-2010
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2010
    ZDB Id: 2158181-2
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  • 10
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    EPOCA/EUR-OCEANS data compilation on the biological and biogeochemical responses to ocean acidification
    Copernicus GmbH ; 2010
    In:  Earth System Science Data Vol. 2, No. 2 ( 2010-07-08), p. 167-175
    Details
    In: Earth System Science Data, Copernicus GmbH, Vol. 2, No. 2 ( 2010-07-08), p. 167-175
    Kurzfassung: Abstract. The uptake of anthropogenic CO2 by the oceans has led to a rise in the oceanic partial pressure of CO2, and to a decrease in pH and carbonate ion concentration. This modification of the marine carbonate system is referred to as ocean acidification. Numerous papers report the effects of ocean acidification on marine organisms and communities but few have provided details concerning full carbonate chemistry and complementary observations. Additionally, carbonate system variables are often reported in different units, calculated using different sets of dissociation constants and on different pH scales. Hence the direct comparison of experimental results has been problematic and often misleading. The need was identified to (1) gather data on carbonate chemistry, biological and biogeochemical properties, and other ancillary data from published experimental data, (2) transform the information into common framework, and (3) make data freely available. The present paper is the outcome of an effort to integrate ocean carbonate chemistry data from the literature which has been supported by the European Network of Excellence for Ocean Ecosystems Analysis (EUR-OCEANS) and the European Project on Ocean Acidification (EPOCA). A total of 185 papers were identified, 100 contained enough information to readily compute carbonate chemistry variables, and 81 data sets were archived at PANGAEA – The Publishing Network for Geoscientific & Environmental Data. This data compilation is regularly updated as an ongoing mission of EPOCA. Data access: http://doi.pangaea.de/10.1594/PANGAEA.735138
    Materialart: Online-Ressource
    ISSN: 1866-3516
    URL: Article
    DOI: 10.5194/essd-2-167-2010
    Sprache: Englisch
    Verlag: Copernicus GmbH
    Publikationsdatum: 2010
    ZDB Id: 2475469-9
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