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  • 2010-2014  (51)
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  • 1
    Book
    Book
    Processes in the Southern Ocean carbon cycle: Dissolution of carbonate sediments and inter-annual variability of carbon fluxes (2012)
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Book
    Pages: IV, 127, IV Bl , graph. Darst
    DDC: 570
    Language: English
    Note: Bremen, Univ., Diss., 2012
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  • 2
    Online Resource
    Online Resource
    Processes in the Southern Ocean carbon cycle: Dissolution of carbonate sediments and inter-annual variability of carbon fluxes (2012)
    Details Availability
    Keywords: Hochschulschrift
    Description / Table of Contents: Carbon cycle, ocean acidification, Antarctica, negative feedback, CO2 sink. - The Southern Ocean (SO) carbon cycle is and will be undergoing various changes in a high-CO2 world. This thesis analyzes two key processes: dissolution of carbonate sediments on Antarctic shelves and inter-annual variability of upper ocean carbon fluxes. In the first part of the thesis, the main question is whether dissolution of carbonate sediments from Antarctic shelves can be a negative feedback to ocean acidification. Patterns in the CaCO3 distribution are related to primary production in the overlying water column. Based on this relationship, the inventory of CaCO3 on all Antarctic shelves is calculated to be 4 Pg CaCO3. This suggests that dissolution of CaCO3 from the sediments will not delay acidification. The second process study addresses the inter-annual variability of carbon fluxes in the SO related to the Southern Annular Mode (SAM). The positive phase of the SAM is characterized by stronger upwelling of carbon and nutrient-rich deep water. The carbon content of the surface layer increases and more natural carbon is released to the atmosphere. South of the Polar Front, however, more CO2 is drawn down by stronger biological export production.
    Type of Medium: Online Resource
    Pages: Online-Ressource
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:46-00102718-17
    URN: urn:nbn:de:gbv:46-00102718-17
    Language: English
    Note: Bremen, Univ., Diss., 2012
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  • 3
    Online Resource
    Online Resource
    Processes in the Southern Ocean carbon cycle: Dissolution of carbonate sediments and inter-annual variability of carbon fluxes (2013)
    Bremerhaven : Alfred-Wegener-Inst., Helmholtz-Zentrum für Polar- und Meeresforschung
    Details Availability
    Type of Medium: Online Resource
    Pages: 121 S , graph Darst
    Series Statement: Berichte zur Polar- und Meeresforschung 669
    URL: http://hdl.handle.net/10013/epic.42211.d001
    Language: English
    Note: Zsfassung in dt. und engl. Sprache , Die vorliegende Arbeit ist die inhaltlich leicht veränderte Fassung einer Dissertation, die am Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung in der Sektion Marine Biogeowissenschaften des Fachbereichs Biowissenschaften angefertigt und 2012 dem Fachbereich 2 (Biologie/Chemie) der Universit¨at Bremen vorgelegt wurde , Zugl.: Bremen, Univ., Diss., 2012
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  • 4
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    Figure 7: Carbonate contribution in macrozoobenthos from the west and east Antarctic Peninsula and western and eastern Weddell Sea regions (2012)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    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; Area/locality; Asteroidea in mass Calcium carbonate per area; Benthos, mass of calcium carbonate; BIOACID; Biological Impacts of Ocean Acidification; Bivalvia, CaCO3; Brachiopoda, CaCO3; Bryozoa, CaCO3; Calculated from wet weight after Brey et al. 2010; Campaign of event; Crinoidea, CaCO3; Depth, bathymetric; DEPTH, sediment/rock; Drake Passage; Echinoidea, CaCO3; Event label; Gastropoda, CaCO3; 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; Holothuroidea, CaCO3; Hydrozoa, CaCO3; Kapp Norvegia; Latitude of event; Lazarev Sea; Longitude of event; Method/Device of event; MG; MULT; Multiboxcorer; Multiple investigations; Ophiuroidea, CaCO3; Optional event label; 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; Scaphopoda as calcium carbonate; 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: text/tab-separated-values, 3052 data points
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    DATA PANGAEA
  • 5
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    Response of carbon fluxes to the Southern Annular Mode: The role of export production and seasonality (2013)
    In:  [Poster] In: 45. International Liege Colloquium on Ocean Dynamics: The variability of primary production in the ocean: from the synoptic to the global scale, 13.-17.05.2013, Liege, Belgium .
    Details
    Publication Date: 2016-05-02
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
  • 6
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    Distribution and mineralogy of carbonate sediments on Antarctic shelves (2012)
    Elsevier
    In:  Journal of Marine Systems, 90 (1). pp. 77-87.
    Details
    Publication Date: 2014-05-05
    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 the 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.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.jmarsys.2011.09.005
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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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
  • 8
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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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  • 9
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    Proceses in the Southern Ocean carbon cycle: Dissolution of carbonate sediments and inter-annual variability of carbon fluxes (2012)
    In:  (PhD/ Doctoral thesis), Universität Bremen, Bremen, Germany, 127 pp
    Details
    Publication Date: 2019-09-23
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 10
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    The Southern Ocean in a high-CO2 world: Changes in inorganic and organic carbon fluxes (2012)
    In:  [Talk] In: 3. International Symposium on The Ocean in a high-CO2 World, 24.-27.09.2012, Monterey, USA .
    Details
    Publication Date: 2016-05-02
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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