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  • 2010-2014  (11)
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  • 1
    Publication Date: 2023-03-16
    Keywords: ANT-XX/2; AWI_MarGeoChem; Calculated; Carbon, organic, particulate; Carbon dioxide; Chlorophyll a; Coulometry; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Fluorescence; Fluorometer, Seapoint; Indian Ocean; Latitude of event; Lazarev Sea; Longitude of event; Marine Geochemistry @ AWI; Nitrate; Nitrate and Nitrite; Nitrite; Non-destructive beta-counting (Rutgers van der Loeff & Moore, 1999); Oxygen; Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91); Polarstern; PS63/021-1; PS63/022-2; PS63/023-1; PS63/024-1; PS63/025-1; PS63/026-2; PS63/027-1; PS63/028-1; PS63/029-1; PS63/030-5; PS63/031-1; PS63/032-1; PS63/033-4; PS63/034-1; PS63/035-1; PS63/036-2; PS63/037-3; PS63/038-3; PS63/039-1; PS63/040-1; PS63/041-3; PS63/042-3; PS63/043-1; PS63/044-1; PS63/046-1; PS63/047-1; PS63/048-1; PS63/049-1; PS63/050-1; PS63/052-1; PS63/053-1; PS63/054-4; PS63/055-3; PS63/056-1; PS63/057-1; PS63/058-1; PS63/059-1; PS63/060-1; PS63/061-4; PS63/062-4; PS63/063-1; PS63/064-2; PS63/065-1; PS63/070-1; PS63/071-1; PS63/072-1; PS63/073-1; PS63/075-1; PS63/076-3; PS63/077-1; PS63/078-1; PS63/079-3; PS63/080-1; PS63/081-2; PS63/082-1; PS63/083-1; PS63/085-1; PS63/086-1; PS63/087-1; PS63/088-1; PS63/089-1; PS63/090-1; PS63/091-1; PS63/092-1; PS63/093-1; PS63/094-1; PS63/095-1; PS63/100-1; PS63/101-1; PS63/104-1; PS63/107-2; PS63/116-1; PS63/119-1; PS63/120-2; PS63/121-2; PS63/122-1; PS63/123-2; PS63/124-1; PS63/125-1; PS63/126-1; PS63/127-1; PS63/128-1; PS63/130-1; PS63/131-1; PS63/133-1; PS63/134-1; PS63/135-1; PS63/137-1; PS63/138-1; PS63/140-1; PS63/141-1; PS63/142-1; PS63/143-1; PS63/144-1; PS63/145-1; PS63/147-1; PS63/148-1; PS63/149-1; PS63/150-1; PS63/152-1; PS63 06AQ200211_2; Riiser-Larsen Sea; Salinity; SBE19 self recording CTD; Seawater analysis after Grasshoff et al., 1983 (Verlag Chemie GmbH Weinheim); Silicate; South Atlantic Ocean; Temperature, water; Thorium-234, fraction of dissolved; Thorium-234, fraction of particulate; Thorium-234, total; Thorium-234/Uranium-238 activity ratio; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 21196 data points
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2023-07-09
    Keywords: ANT-XX/2; Asteromphalus hookeri; Asteromphalus hyalinus; AWI_MarGeoChem; Chaetoceros aequatorialis; Chaetoceros atlanticus; Chaetoceros bulbosus; Chaetoceros castracanei; Chaetoceros convolutus; Chaetoceros criophilum; Chaetoceros debilis; Chaetoceros dichaeta; Ciliates, heterotrophic, naked; Corethron pennatum; Counting; CTD/Rosette; CTD-RO; Cylindrotheca closterium; Dactyliosolen antarcticus; Date/Time of event; DEPTH, water; Diatoms, pennales indeterminata; Dictyocha speculum; Dinoflagellates, naked; Dinoflagellates, thecate; Elevation of event; Event label; Fecal pellets; Fragilariopsis curta; Fragilariopsis cylindrus; Fragilariopsis kerguelensis; Fragilariopsis obliquecostata; Fragilariopsis rhombica; Fragilariopsis ritscheri; Fragilariopsis spp.; Guinardia cylindrus; Haslea trompii; Indian Ocean; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; Membraneis imposter; MUC; MultiCorer; Pleurosigma sp.; Polarstern; Proboscia alata; Proboscia inermis; Proboscia truncata; Prorocentrum spp.; Protoperidinium spp., heterotrophic; PS63/048-1; PS63/054-5; PS63/095-3; PS63/112-4; PS63/121-2; PS63/127-1; PS63/139-2; PS63/143-2; PS63/146-1; PS63/152-1; PS63 06AQ200211_2; Pseudo-nitzschia heimii; Pseudo-nitzschia lineola; Pseudo-nitzschia turgiduloides; Rhizosolenia chunii; Rhizosolenia spp.; Riiser-Larsen Sea; South Atlantic Ocean; Thalassiosira gracilis; Thalassiosira lentiginosa; Thalassiosira oliverana; Thalassiosira spp.; Thalassiothrix antarctica; Tintinnids, heterotrophic; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 924 data points
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2023-07-09
    Keywords: Abundance estimate; ANT-XX/2; Asteromphalus hookeri; Asteromphalus hyalinus; AWI_MarGeoChem; Chaetoceros aequatorialis; Chaetoceros atlanticus; Chaetoceros bulbosus; Chaetoceros castracanei; Chaetoceros convolutus; Chaetoceros criophilus; Chaetoceros debilis; Chaetoceros dichaeta; Ciliates, heterotrophic, naked; Corethron pennatum; Cylindrotheca closterium; Dactyliosolen antarcticus; DEPTH, water; Diatoms, pennales indeterminata; Dictyocha speculum; Dinoflagellates, naked; Dinoflagellates, thecate; Fecal pellets; Fragilariopsis curta; Fragilariopsis cylindrus; Fragilariopsis kerguelensis; Fragilariopsis obliquecostata; Fragilariopsis rhombica; Fragilariopsis ritscheri; Fragilariopsis spp.; Guinardia cylindrus; Haslea trompii; Marine Geochemistry @ AWI; Membraneis imposter; MIC; MiniCorer; Pleurosigma sp.; Polarstern; Proboscia alata; Proboscia inermis; Proboscia truncata; Prorocentrum spp.; Protoperidinium spp., heterotrophic; PS63/064-6; PS63 06AQ200211_2; Pseudo-nitzschia heimii; Pseudo-nitzschia lineola; Pseudo-nitzschia turgiduloides; Rhizosolenia chunii; Rhizosolenia spp.; South Atlantic Ocean; Thalassiosira gracilis; Thalassiosira lentiginosa; Thalassiosira oliverana; Thalassiosira spp.; Thalassiothrix antarctica; Tintinnids, heterotrophic
    Type: Dataset
    Format: text/tab-separated-values, 46 data points
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  • 4
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    PANGAEA
    In:  Supplement to: Geibert, Walter; Assmy, Philipp; Bakker, Dorothee C E; Hanfland, Claudia; Hoppema, Mario; Pichevin, Laetitia; Schröder, Michael; Schwarz, Jill Nicola; Stimac, Ingrid; Usbeck, Regina; Webb, Adrian (2010): High productivity in an ice melting hot spot at the eastern boundary of the Weddell Gyre. Global Biogeochemical Cycles, 24, GB3007, https://doi.org/10.1029/2009GB003657
    Publication Date: 2023-10-28
    Description: The Southern Ocean (SO) plays a key role in modulating atmospheric CO2 via physical and biological processes. However, over much of the SO, biological activity is iron-limited. New in situ data from the Antarctic zone south of Africa in a region centered at -20°E - 25°E reveal a previously overlooked region of high primary production, comparable in size to the northwest African upwelling region. Here, sea ice together with enclosed icebergs is channeled by prevailing winds to the eastern boundary of the Weddell Gyre, where a sharp transition to warmer waters causes melting. This cumulative melting provides a steady source of iron, fuelling an intense phytoplankton bloom that is not fully captured by monthly satellite production estimates. These findings imply that future changes in sea-ice cover and dynamics could have a significant effect on carbon sequestration in the SO.
    Keywords: ANT-XX/2; AWI_MarGeoChem; CTD/Rosette; CTD-RO; Indian Ocean; Lazarev Sea; Marine Geochemistry @ AWI; MIC; MiniCorer; MUC; MULT; MultiCorer; Multiple investigations; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS63/021-1; PS63/022-2; PS63/023-1; PS63/024-1; PS63/025-1; PS63/026-2; PS63/027-1; PS63/028-1; PS63/029-1; PS63/030-5; PS63/031-1; PS63/032-1; PS63/033-4; PS63/034-1; PS63/035-1; PS63/036-2; PS63/037-3; PS63/038-3; PS63/039-1; PS63/040-1; PS63/041-3; PS63/042-3; PS63/043-1; PS63/044-1; PS63/046-1; PS63/047-1; PS63/048-1; PS63/049-1; PS63/050-1; PS63/052-1; PS63/053-1; PS63/054-4; PS63/054-5; PS63/055-3; PS63/056-1; PS63/057-1; PS63/058-1; PS63/059-1; PS63/060-1; PS63/061-4; PS63/062-4; PS63/063-1; PS63/064-2; PS63/064-6; PS63/065-1; PS63/070-1; PS63/071-1; PS63/072-1; PS63/073-1; PS63/075-1; PS63/076-3; PS63/077-1; PS63/078-1; PS63/079-3; PS63/080-1; PS63/081-2; PS63/082-1; PS63/083-1; PS63/083-2; PS63/085-1; PS63/086-1; PS63/087-1; PS63/088-1; PS63/089-1; PS63/090-1; PS63/091-1; PS63/092-1; PS63/093-1; PS63/094-1; PS63/095-1; PS63/095-3; PS63/100-1; PS63/101-1; PS63/104-1; PS63/107-2; PS63/112-4; PS63/116-1; PS63/119-1; PS63/120-2; PS63/121-2; PS63/122-1; PS63/123-2; PS63/124-1; PS63/125-1; PS63/126-1; PS63/127-1; PS63/128-1; PS63/130-1; PS63/131-1; PS63/133-1; PS63/134-1; PS63/135-1; PS63/137-1; PS63/138-1; PS63/139-2; PS63/140-1; PS63/141-1; PS63/142-1; PS63/143-1; PS63/143-2; PS63/144-1; PS63/145-1; PS63/146-1; PS63/147-1; PS63/148-1; PS63/149-1; PS63/150-1; PS63/152-1; PS63/182-2; PS63/197-1; PS63/216-2; PS63 06AQ200211_2; Riiser-Larsen Sea; South Atlantic Ocean; SPP1158; Weddell Sea
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 5
    Publication Date: 2024-03-22
    Keywords: ANT-XX/2; AWI_MarGeoChem; Calculated; Calculated from conductivity; Carbon, organic, total; Carbon, total, particulate; Carbon, total, particulate, salt corrected; Carbon/Nitrogen ratio; Chlorophyll total; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Element analyser CHN; Event label; Fluorometer, in-situ; ICP-OES, Inductively coupled plasma - optical emission spectrometry; Indian Ocean; Iron; Iron/Carbon ratio; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; MIC; MiniCorer; MUC; MultiCorer; Nitrogen, total, particulate; Nitrogen, total, particulate, salt corrected; Opal, auto analysis (Müller & Schneider, 1993); Opal, biogenic silica, water free; Particle concentration; Polarstern; PS63/048-1; PS63/054-5; PS63/064-6; PS63/083-2; PS63/095-3; PS63/112-4; PS63/121-2; PS63/127-1; PS63/139-2; PS63/143-2; PS63/146-1; PS63/152-1; PS63 06AQ200211_2; Riiser-Larsen Sea; Salt content; Sample mass; Sample volume; Silica, particulate, salt corrected; South Atlantic Ocean; Sulfur, total, particulate; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 202 data points
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  • 6
    Publication Date: 2017-10-04
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 7
    Publication Date: 2019-07-16
    Description: Fertilization of the ocean by adding iron compounds has induced diatom-dominated phytoplankton blooms accompanied by considerable carbon dioxide drawdown in the ocean surface layer. However, because the fate of bloom biomass could not be adequately resolved in these experiments, the timescales of carbon sequestration from the atmosphere are uncertain. Here we report the results of a five-week experiment carried out in the closed core of a vertically coherent, mesoscale eddy of the Antarctic Circumpolar Current, during which we tracked sinking particles from the surface to the deep-sea floor. A large diatom bloom peaked in the fourth week after fertilization. This was followed by mass mortality of several diatom species that formed rapidly sinking, mucilaginous aggregates of entangled cells and chains. Taken together, multiple lines of evidence—although each with important uncertainties—lead us to conclude that at least half the bloom biomass sank far below a depth of 1,000 metres and that a substantial portion is likely to have reached the sea floor. Thus, iron-fertilized diatom blooms may sequester carbon for timescales of centuries in ocean bottom water and for longer in the sediments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
    Publication Date: 2019-09-23
    Description: Fertilization of the ocean by adding iron compounds has induced diatom-dominated phytoplankton blooms accompanied by considerable carbon dioxide drawdown in the ocean surface layer. However, because the fate of bloom biomass could not be adequately resolved in these experiments, the timescales of carbon sequestration from the atmosphere are uncertain. Here we report the results of a five-week experiment carried out in the closed core of a vertically coherent, mesoscale eddy of the Antarctic Circumpolar Current, during which we tracked sinking particles from the surface to the deep-sea floor. A large diatom bloom peaked in the fourth week after fertilization. This was followed by mass mortality of several diatom species that formed rapidly sinking, mucilaginous aggregates of entangled cells and chains. Taken together, multiple lines of evidence—although each with important uncertainties—lead us to conclude that at least half the bloom biomass sank far below a depth of 1,000 metres and that a substantial portion is likely to have reached the sea floor. Thus, iron-fertilized diatom blooms may sequester carbon for timescales of centuries in ocean bottom water and for longer in the sediments.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
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  • 9
    Publication Date: 2019-07-08
    Description: Surface delta(15)N(PON) increased 3.92 +/- 0.48 over the course of 20 days following additions of iron (Fe) to an eddy in close proximity to the Antarctic Polar Front in the Atlantic sector of the Southern Ocean. The change in delta(15)N(PON) was associated with an increase in the 〉20 mu m size fraction, leading to a maximal difference of 6.23 between the 〉20 mu m and 〈20 mu m size fractions. Surface delta(13)C(POC) increased 1.18 +/- 0.31 over the same period. After a decrease in particulate organic matter in the surface layer, a second phytoplankton community developed that accumulated less biomass, had a slower growth rate and was characterized by an offset of 1.56 in delta(13)C(POC) relative to the first community. During growth of the second community, surface delta(13)C(POC) further increased 0.83 +/- 0.13. Here we speculate on ways that carboxylation, nitrogen assimilation, substrate pool enrichment and community composition may have contributed to the gradual increase in delta(13)C(POC) associated with phytoplankton biomass accumulation, as well as the systematic offset in delta(13)C(POC) between the two phytoplankton communities.
    Type: Article , PeerReviewed
    Format: text
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  • 10
    Publication Date: 2013-11-12
    Description: Background: The discovery of gene body methylation, which refers to DNA methylation within gene coding region, suggests an as yet unknown role of DNA methylation at actively transcribed genes. In invertebrates, gene bodies are the primary targets of DNA methylation, and only a subset of expressed genes is modified. Results: Here we investigate the tissue variability of both the global levels and distribution of 5-methylcytosine (5mC) in the sea squirt Ciona intestinalis. We find that global 5mC content of early developmental embryos is high, but is strikingly reduced in body wall tissues. We chose sperm and adult muscle cells, with high and reduced levels of global 5mC respectively, for genome-wide analysis of 5mC targets. By means of CXXC-affinity purification followed by deep sequencing (CAP-seq), and genome-wide bisulfite sequencing (BS-seq), we designated body-methylated and unmethylated genes in each tissue. Surprisingly, body-methylated and unmethylated gene groups are identical in the sperm and muscle cells. Our analysis of microarray expression data shows that gene body methylation is associated with broad expression throughout development. Moreover, transgenic analysis reveals contrasting gene body methylation at an identical gene-promoter combination when integrated at different genomic sites. Conclusions: We conclude that gene body methylation is not a direct regulator of tissue specific gene expression in C. intestinalis. Our findings reveal constant targeting of gene body methylation irrespective of cell type, and they emphasize a correlation between gene body methylation and ubiquitously expressed genes. Our transgenic experiments suggest that the promoter does not determine the methylation status of the associated gene body.
    Electronic ISSN: 1756-8935
    Topics: Biology , Medicine
    Published by BioMed Central
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