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  • PANGAEA  (106)
  • AGU (American Geophysical Union)  (3)
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  • 1
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    Seasonally different carbon flux changes in the Southern Ocean in response to the southern annular mode (2013)
    AGU (American Geophysical Union) | Wiley
    In:  Global Biogeochemical Cycles, 27 (4). pp. 1236-1245.
    Details
    Publication Date: 2016-05-02
    Description: Stratospheric ozone depletion and emission of greenhouse gases lead to a trend of the southern annular mode (SAM) toward its high-index polarity. The positive phase of the SAM is characterized by stronger than usual westerly winds that induce changes in the physical carbon transport. Changes in the natural carbon budget of the upper 100 m of the Southern Ocean in response to a positive SAM phase are explored with a coupled ecosystem-general circulation model and regression analysis. Previously overlooked processes that are important for the upper ocean carbon budget during a positive SAM period are identified, namely, export production and downward transport of carbon north of the polar front (PF) as large as the upwelling in the south. The limiting micronutrient iron is brought into the surface layer by upwelling and stimulates phytoplankton growth and export production but only in summer. This leads to a drawdown of carbon and less summertime outgassing (or more uptake) of natural CO2. In winter, biological mechanisms are inactive, and the surface ocean equilibrates with the atmosphere by releasing CO2. In the annual mean, the upper ocean region south of the PF loses more carbon by additional export production than by the release of CO2 into the atmosphere, highlighting the role of the biological carbon pump in response to a positive SAM event.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2013GB004600
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Insignificant buffering capacity of Antarctic shelf carbonates (2013)
    AGU (American Geophysical Union) | Wiley
    In:  Global Biogeochemical Cycles, 27 (1). pp. 11-20.
    Details
    Publication Date: 2016-05-02
    Description: We combined data sets of measured sedimentary calcium carbonate (CaCO3) and satellite-derived pelagic primary production to parameterize the relation between CaCO3 content on the Antarctic shelves and primary production in the overlying water column. CaCO3 content predicted in this way was in good agreement with the measured data. The parameterization was then used to chart CaCO3 content on the Antarctic shelves all around the Antarctic, using the satellite-derived primary production. The total inventory of CaCO3 in the bioturbated layer of Antarctic shelf sediments was estimated to be 0.5 Pg C. This quantity is comparable to the total CO2 uptake by the Southern Ocean in only one to a few years (dependent on the uptake estimate and area considered), indicating that the dissolution of these carbonates will neither delay ocean acidification in this area nor augment the Southern Ocean CO2 uptake capacity.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2011GB004211
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Biological and physical controls on N2, O2, and CO2 distributions in contrasting Southern Ocean surface waters (2015)
    AGU (American Geophysical Union) | Wiley
    In:  Global Biogeochemical Cycles, 29 (7). pp. 994-1013.
    Details
    Publication Date: 2019-07-11
    Description: We present measurements of pCO2, O2 concentration, biological oxygen saturation (ΔO2/Ar), and N2 saturation (ΔN2) in Southern Ocean surface waters during austral summer, 2010–2011. Phytoplankton biomass varied strongly across distinct hydrographic zones, with high chlorophyll a (Chl a) concentrations in regions of frontal mixing and sea ice melt. pCO2 and ΔO2/Ar exhibited large spatial gradients (range 90 to 450 µatm and −10 to 60%, respectively) and covaried strongly with Chl a. However, the ratio of biological O2 accumulation to dissolved inorganic carbon (DIC) drawdown was significantly lower than expected from photosynthetic stoichiometry, reflecting the differential time scales of O2 and CO2 air-sea equilibration. We measured significant oceanic CO2 uptake, with a mean air-sea flux (~ −10 mmol m−2 d−1) that significantly exceeded regional climatological values. N2 was mostly supersaturated in surface waters (mean ΔN2 of +2.5%), while physical processes resulted in both supersaturation and undersaturation of mixed layer O2 (mean ΔO2phys = 2.1%). Box model calculations were able to reproduce much of the spatial variability of ΔN2 and ΔO2phys along the cruise track, demonstrating significant effects of air-sea exchange processes (e.g., atmospheric pressure changes and bubble injection) and mixed layer entrainment on surface gas disequilibria. Net community production (NCP) derived from entrainment-corrected surface ΔO2/Ar data, ranged from ~ −40 to 〉 300 mmol O2 m−2 d−1 and showed good coherence with independent NCP estimates based on seasonal mixed layer DIC deficits. Elevated NCP was observed in hydrographic frontal zones and stratified regions of sea ice melt, reflecting physical controls on surface water light fields and nutrient availability.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1002/2014GB004975
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Physical oceanography during POLARSTERN cruise ANT-XX/2 (stations 182, 197 and 216)
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: ANT-XX/2; AWI_MarGeoChem; Chlorophyll a; Computed; CTD; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Indian Ocean; Latitude of event; Longitude of event; Marine Geochemistry @ AWI; MULT; Multiple investigations; Polarstern; PS63/182-2; PS63/197-1; PS63/216-2; PS63 06AQ200211_2; Salinity; SBE19 self recording CTD; South Atlantic Ocean; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 6888 data points
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    DATA PANGAEA
  • 5
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    Underway physical oceanography and carbon dioxide measurements during POLARSTERN cruise ANT-XV/4
    PANGAEA
    In:  Bjerknes Centre for Climate Research
    Details
    Publication Date: 2023-06-10
    Keywords: 06AQ19980411-track; ANT-XV/4; CT; DATE/TIME; Depth, bathymetric, interpolated/gridded; DEPTH, water; extracted from the 2-Minute Gridded Global Relief Data (ETOPO2); extracted from the NCEP/NCAR 40-Year Reanalysis Project; extracted from the World Ocean Atlas 2005; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); LATITUDE; LONGITUDE; Polarstern; Pressure, atmospheric; Pressure, atmospheric, interpolated; PS49 06AQANTXV_4; Recomputed after SOCAT (Pfeil et al., 2013); Salinity; Salinity, interpolated; SOCAT; Surface Ocean CO2 Atlas Project; Temperature, water; Temperature at equilibration; Underway cruise track measurements; xCO2 (water) at equilibrator temperature (dry air)
    Type: Dataset
    Format: text/tab-separated-values, 72621 data points
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    DATA PANGAEA
  • 6
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    Underway physical oceanography and carbon dioxide measurements during POLARSTERN cruise ANT-XIII/4
    PANGAEA
    Details
    Publication Date: 2023-06-10
    Keywords: 06AQ19960320-track; ANT-XIII/4; CT; DATE/TIME; Depth, bathymetric, interpolated/gridded; DEPTH, water; extracted from the 2-Minute Gridded Global Relief Data (ETOPO2); extracted from the NCEP/NCAR 40-Year Reanalysis Project; extracted from the World Ocean Atlas 2005; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); LATITUDE; LONGITUDE; Polarstern; Pressure, atmospheric; Pressure, atmospheric, interpolated; PS40 06AQANTXIII_4; Recomputed after SOCAT (Pfeil et al., 2013); Salinity; Salinity, interpolated; SOCAT; Surface Ocean CO2 Atlas Project; Temperature, water; Temperature at equilibration; Underway cruise track measurements; xCO2 (water) at equilibrator temperature (dry air)
    Type: Dataset
    Format: text/tab-separated-values, 68481 data points
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    DATA PANGAEA
  • 7
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    Calcium carbonate content in surface sediments and benthic fauna on Antarctic shelves
    PANGAEA
    In:  Supplement to: Hauck, Judith; Gerdes, Dieter; Hillenbrand, Claus-Dieter; Hoppema, Mario; Kuhn, Gerhard; Nehrke, Gernot; Völker, Christoph; Wolf-Gladrow, Dieter A (2012): Distribution and mineralogy of carbonate sediments on Antarctic shelves. Journal of Marine Systems, 90(1), 77-87, https://doi.org/10.1016/j.jmarsys.2011.09.005
    Details
    Publication Date: 2023-06-27
    Description: We analyzed 214 new core-top samples for their CaCO3 content from shelves all around Antarctica in order to understand their distribution and contribution to the marine carbon cycle. The distribution of sedimentary CaCO3 on the Antarctic shelves is connected to environmental parameters where we considered water depth, width of the shelf, sea-ice coverage and primary production. While CaCO3 contents of surface sediments are usually low, high(〉 15%) CaCO3 contents occur at shallow water depths (150-200 m) on narrow shelves of the eastern Weddell Sea and at a depth range of 600-900 m on the broader and deeper shelves of the Amundsen, Bellingshausen and western Weddell Seas. Regions with high primary production, such as the Ross Sea and the western Antarctic Peninsula region, have generally low CaCO3 contents in the surface sediments. The predominant mineral phase of CaCO3 on the Antarctic shelves is low-magnesium calcite. With respect to ocean acidification, our findings suggest that dissolution of carbonates in Antarctic shelf sediments may be an important negative feedback only after the onset of calcite undersaturation on the Antarctic shelves. Macrozoobenthic CaCO3 standing stocks do not increase the CaCO3 budget significantly as they are two orders of magnitude lower than the budget of the sediments. This first circumpolar compilation of Antarctic shelf carbonate data does not claim to be complete. Future studies are encouraged and needed to fill data gaps especially in the under-sampled southwest Pacific and Indian Ocean sectors of the Southern Ocean.
    Keywords: ANT-III/2; ANT-IX/3; ANT-V/1; ANT-VI/3; ANT-VII/4; ANT-XIII/3; ANT-XIX/5; ANT-XV/3; ANT-XVII/3; ANT-XXI/2; ANT-XXIII/8; BIOACID; Biological Impacts of Ocean Acidification; Drake Passage; Giant box corer; GKG; Haul 1; Haul 10; Haul 11; Haul 12; Haul 20; Haul 22; Haul 23; Haul 24; Haul 25; Haul 26; Haul 27; Haul 28; Haul 29; Haul 30; Haul 31; Haul 33; Haul 35; Haul 36; Haul 37; Haul 38; Haul 4; Haul 5; Haul 6; Haul 8; Haul 9; Kapp Norvegia; Lazarev Sea; MG; MULT; Multiboxcorer; Multiple investigations; Polarstern; PS06; PS06/120-1; PS06/151-7; PS06/158-1; PS06/196-2; PS06/203-2; PS06/207-3; PS06/208-1; PS09/004-2; PS09/010-3; PS09/020-2; PS09/091-6; PS09/115-3; PS09/119-5; PS09/123-5; PS09/126-5; PS09/132-2; PS09/134-3; PS09/136-4; PS09/138-3; PS09/139-3; PS09/140-3; PS09/141-3; PS09/142-4; PS09/143-3; PS09/145-3; PS09/147-3; PS09/148-3; PS09/149-4; PS09/150-1; PS09/151-3; PS09/152-3; PS09/153-3; PS09/154-3; PS09/155-2; PS09 WWSP86 SIBEX; PS12; PS12/266; PS12/298; PS12/305; PS12/308; PS12/314; PS12/323; PS12/333; PS12/342; PS12/344; PS12/346; PS12/348; PS12/354; PS12/362-2; PS12/372; PS12/378; PS12/384; PS12/387; PS12/396; PS12/418; PS12/437; PS12/503; PS12/512-2; PS14/229-1; PS14/235-1; PS14/241-1; PS14/245-1; PS14/248-1; PS14/249-1; PS14/250-11; PS14/250-8; PS14/274-1; PS14/277-1; PS14/292-1; PS14 EPOS I; PS1579-1; PS1589-1; PS1593-1; PS1594-1; PS1597-1; PS1601-1; PS1604-1; PS1608-1; PS1609-1; PS1610-4; PS1611-1; PS1614-1; PS1621-1; PS1624-1; PS1627-1; PS1628-2; PS1629-1; PS1631-1; PS1632-1; PS1641-1; PS18; PS18/127; PS18/129; PS18/135; PS18/162; PS18/165; PS18/171; PS18/173; PS18/175-8; PS18/179-4; PS18/180-5; PS18/189; PS18/212-7; PS18/216; PS18/220-1; PS18/222; PS1995-1; PS1997-2; PS1998-1; PS2016-3; PS2018-1; PS2024-1; PS2026-2; PS2042-2; PS2063-1; PS2068-1; PS39/002-3; PS39/002-4; PS39/002-6; PS39/002-7; PS39/004-9; PS39/005-13; PS39/005-14; PS39/005-15; PS39/005-6; PS39/006-17; PS39/006-19; PS39/006-20; PS39/006-21; PS39/008-4; PS39/008-5; PS39/008-7; PS39/009-10; PS39/009-11; PS39/009-12; PS39/009-6; PS39/009-9; PS39/024-7; PS39/024-8; PS39/025-8; PS39/026-4; PS39 EASIZ; PS48/047; PS48/048; PS48/063; PS48/065-2; PS48/067; PS48/068; PS48/069; PS48/092; PS48/146; PS48/188; PS48/216; PS48/223; PS48/224; PS48/225; PS48/227; PS48/228; PS48/230; PS48/299; PS48/300; PS48/325; PS48/326; PS48/341; PS48/345; PS48 EASIZ II; PS56/090-1; PS56/098-2; PS56/108-1; PS56/112-1; PS56/113-1; PS56/114-1; PS56/120-1; PS56/121-1; PS56/135-6; PS56/137-1; PS56/148-3; PS56/160-2; PS56/161-2; PS56/162-2; PS56/169-1; PS56/176-2; PS56/177-3; PS56/178-1; PS56/179-1; PS56/180-1; PS56/190-2; PS56/190-3; PS56 EASIZ III; PS61/163-1; PS61/176-1; PS61 LAMPOS; PS65/076-1; PS65/077-1; PS65/080-1; PS65/082-1; PS65/084-1; PS65/105-1; PS65/106-1; PS65/116-1; PS65/124-1; PS65/125-1; PS65/183-1; PS65/185-1; PS65/187-1; PS65/197-1; PS65/199-1; PS65/201-1; PS65/202-1; PS65/282-1; PS65/331-1; PS65 BENDEX; PS69; PS69/693-3; PS69/700-1; PS69/701-1; PS69/703-4; PS69/704-1; PS69/706-3; PS69/709-6; PS69/715-3; PS69/718-7; PS69/722-2; PS69/725-4; Scotia Sea, southwest Atlantic; South Atlantic Ocean; South Pacific Ocean; van Veen Grab; VGRAB; Walther Herwig II; Weddell Sea; Weddell Sea, Larsen-A; Weddell Sea, Larsen-B; WH068/1; WH068/1_089; WH068/1_090; WH068/1_096; WH068/1_100; WH068/1_101; WH068/1_102; WH068/1_106; WH068/1_107; WH068/1_114; WH068/1_116; WH068/1_120; WH068/1_133; WH068/1_137; WH068/1_142; WH068/1_143; WH068/1_148; WH068/1_149; WH068/1_154; WH068/1_155; WH068/1_160; WH068/1_161; WH068/1_165; WH068/1_166; WH068/1_171; WH068/2; WH068/2_266; WH068/2_275; WH068/2_278; WH068/2_287; WH068/2_293; WH068/2_311; WH068/2_312; WH068/2_313; WH068/2_319; WH068/2_320; WH113/1, SIBEX-II; WH113/2, SIBEX-II
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Calcium carbonate content in surface sediments on Antarctic shelves
    PANGAEA
    Details
    Publication Date: 2023-06-21
    Keywords: Area/locality; BIOACID; Biological Impacts of Ocean Acidification; Calcium carbonate; Depth, bathymetric; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Gear; LATITUDE; LONGITUDE; Reference of data; Sample code/label
    Type: Dataset
    Format: text/tab-separated-values, 2842 data points
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    DATA PANGAEA
  • 9
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    Plankton abundance measured in surface water during Polarstern cruise ANT-XX/2 (2010)
    PANGAEA
    Details
    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
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    DATA PANGAEA
  • 10
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    Estimated plankton abundance at station PS63/064-6 (2010)
    PANGAEA
    Details
    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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    DATA PANGAEA
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