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  • 1
    Online Resource
    Online Resource
    Origin, composition and evolution of fumarolic fluids of subduction zone volcanoes in Nicaragua (2006)
    Details Availability
    Keywords: Hochschulschrift ; Nicaragua ; Subduktion ; Fumarole
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: IX, 86 Bl., 17.48 MB) , Ill., graph. Darst., Kt.
    Edition: 2008 [Online-Ausg.]
    URL: http://eldiss.uni-kiel.de/macau/receive/dissertation_diss_1859
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-18599
    URL: http://d-nb.info/1007352566/34
    URL: http://eldiss.uni-kiel.de/macau/receive/dissertation_diss_00001859
    URN: urn:nbn:de:gbv:8-diss-18599
    DDC: 550
    Language: English
    Note: Enth. Zeitschriftenaufsätze , Kiel, Univ., Diss., 2006 , Online-Ausg.: , [Online-Ausg.]
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  • 2
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    Simulated changes in the carbon cycle using the BICYCLE model due to volcanic outgassing of CO2 (2017)
    PANGAEA
    In:  Supplement to: Hasenclever, Jörg; Knorr, Gregor; Rüpke, Lars H; Köhler, Peter; Morgan, Jason Phipps; Garofalo, Kristin; Barker, Stephen; Lohmann, Gerrit; Hall, Ian R (2017): Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing. Nature Communications, 8, 15867, https://doi.org/10.1038/ncomms15867
    Details
    Publication Date: 2023-01-13
    Description: Paleo-climate records and geodynamic modelling indicate the existence of complex interactions between glacial sea level changes, volcanic degassing, and atmospheric CO2, which may have modulated the climate system's descent into the last ice age. Between ~85-70 ka, during an interval of decreasing axial tilt, the orbital component in global temperature records gradually declined, while atmospheric CO2, instead of continuing is long-term correlation with Antarctic temperature, remained relatively stable. Based on novel global geodynamic models and the joint interpretation of paleo-proxy data as well as biogeochemical simulations, we show that a sea level fall in this interval caused enhanced pressure-release melting in the uppermost mantle, which may have induced a surge in magma and CO2 fluxes from mid-ocean ridges and oceanic hotspot volcanoes. Our results reveal a hitherto unrecognised negative feedback between glaciation and atmospheric CO2 predominantly controlled by marine volcanism on multi-millennial (suborbital) timescales of ~ 5,000-15,000 years.
    Keywords: File content; File format; File name; File size; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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    DATA PANGAEA
  • 3
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    Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing (2017)
    Macmillan Publishers Limited
    In:  EPIC3Nature Communications, Macmillan Publishers Limited, 8(15867), pp. 1-11, ISSN: 2041-1723
    Details
    Publication Date: 2017-07-26
    Description: Paleo-climate records and geodynamic modelling indicate the existence of complex interactions between glacial sea level changes, volcanic degassing and atmospheric CO2, which may have modulated the climate system’s descent into the last ice age. Between ∼85 and 70 kyr ago, during an interval of decreasing axial tilt, the orbital component in global temperature records gradually declined, while atmospheric CO2, instead of continuing its long-term correlation with Antarctic temperature, remained relatively stable. Here, based on novel global geodynamic models and the joint interpretation of paleo-proxy data as well as biogeochemical simulations, we show that a sea level fall in this interval caused enhanced pressure-release melting in the uppermost mantle, which may have induced a surge in magma and CO2 fluxes from mid-ocean ridges and oceanic hotspot volcanoes. Our results reveal a hitherto unrecognized negative feedback between glaciation and atmospheric CO2 predominantly controlled by marine volcanism on multi-millennial timescales of ∼5,000–15,000 years.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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    PAPER (OA)
  • 4
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    Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing (2017)
    Nature Research
    In:  Nature Communications, 8 (15867).
    Details
    Publication Date: 2020-06-18
    Description: Paleo-climate records and geodynamic modelling indicate the existence of complex interactions between glacial sea level changes, volcanic degassing and atmospheric CO2, which may have modulated the climate system's descent into the last ice age. Between ∼85 and 70 kyr ago, during an interval of decreasing axial tilt, the orbital component in global temperature records gradually declined, while atmospheric CO2, instead of continuing its long-term correlation with Antarctic temperature, remained relatively stable. Here, based on novel global geodynamic models and the joint interpretation of paleo-proxy data as well as biogeochemical simulations, we show that a sea level fall in this interval caused enhanced pressure-release melting in the uppermost mantle, which may have induced a surge in magma and CO2 fluxes from mid-ocean ridges and oceanic hotspot volcanoes. Our results reveal a hitherto unrecognized negative feedback between glaciation and atmospheric CO2 predominantly controlled by marine volcanism on multi-millennial timescales of ∼5,000-15,000 years.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/ncomms15867
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Geochemical and isotopic study of fumarolic emissions from three Nicaraguan Volcanoes (2004)
    In:  [Poster] In: IAVCEI Generally Assembly, 14.-20.11, Pucon, Chile .
    Details
    Publication Date: 2019-09-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Poster
  • 6
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    Origin, composition and evolution of fumarolic fluids of subduction zone volcanoes in Nicaragua (2006)
    In:  (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 87 pp
    Details
    Publication Date: 2019-09-23
    Description: During four field campaigns (2001-2003), fumarolic gases from the two Nicaraguan volcanoes Mombacho and Momotombo were repeatedly sampled with the objective of gaining a better understanding of processes occurring within their volcano-magma-systems. Mombacho is a highly dissected stratocone volcano that is generally considered extinct. The combined chemical and isotopic composition of the gases provide evidence for high-temperature conditions in the shallow subsurface. This suggests that Mombacho volcano should not be considered extinct, and could re-awaken and erupt in the future. Momotombo is an active volcano in persistent state of fumarolic activity since its last eruption in 1905 and discharges gases at high temperatures. The chemistry, isotopic compositions and trace element contents of the gases have changed considerably over the last 20 years. These changes appear to be related to degassing of different magma batches and major changes in the interaction between the magmatic and hydrothermal systems. Flux estimates for some highly volatile and potentially harmful trace elements of magmatic origin (e.g. Tl, Bi, As, Se, Sb, Hg, Cd) show that Momotombo is only a minor source of pollutants in the atmosphere.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 7
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    Cyclic degassing behaviour at San Cristóbal and Telica Volcanoes, Nicaragua (2004)
    In:  [Talk] In: IAVCEI Generally Assembly, 14.-20.11.2004, Pucon, Chile .
    Details
    Publication Date: 2019-09-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 8
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    \The collapsing volcano\" Mombacho (Nicaragua): is it experiencing a renew phase of volcanic activity?" (2005)
    In:  [Talk] In: LAK 2005: 19th Colloquium on Latin American Earth Sciences, 18.- 20.04.2005, Potsdam, Germany .
    Details
    Publication Date: 2019-09-23
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 9
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    Remote sensing of thermal emission and degassing at Villarrica Volcano, Chile (2011)
    In:  [Talk] In: AGU Fall Meeting 2011, 05.12.-09.12.2011, San Francisco, California, USA .
    Details
    Publication Date: 2020-10-16
    Description: ABSTRACT FINAL ID: V44C-02 Villarrica is one of the most active volcanoes in Chile and is presently characterized by activity from open continuously degassing conduit. The twohundred meter diameter crater contains a persistent lava lake which has a diameter of approximately ten meters. For the quantification of SO2 fluxes three stationary NOVAC-type scanning Mini-DOAS UV spectrometers were installed at the volcano in March 2009. To validate the ground-based gas measurements we compared them to thermal anomalies detected by the MODVOLC algorithm which is provided by the Hawai'i Institute of Geophysics and Planetology (http://modis.higp.hawaii.edu). The MODVOLC algorithm (WRIGHT et al., 2002) uses data from the space-based Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the National Aeronautics and Space Administration’s Terra and Aqua platforms and it exhibits the possibility to monitor volcanic heat sources. Although it was not intended to detect low intensity activity from open vent degassing, we find that in the case of Villarrica the detected thermal anomalies seem to originate from the heat carried by the gas phase. Additionally we have registered correlation between SO2 fluxes and thermal activity during the whole period of our ground-based gas-monitoring. Thermal anomalies detected by the MODVOLC algorithm coincide with observed periods of increased gas flux, enabling us to estimate gas fluxes indirectly from thermal data. Wright R. et al. (2002) Remote Sensing of Environment 82, 135-155
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 10
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    Multiparameter surveillance of Villarrica volcano (2010)
    In:  [Talk] In: SFB 574 Subduction Workshop, 04.-07.11.2010, Pucon, Chile .
    Details
    Publication Date: 2019-09-24
    Description: Villarrica is one of the most active volcanoes in Chile and one of the few in the world with an active lava lake within its crater. This snow-covered volcano generates frequent strombolian eruptions and lava flows and, at times, the melting of snow can cause massive lahars. The most common types of activity at Villarrica are, however, continuous degassing and high-level seismicity. In order to investigate the mechanisms driving the persistent degassing and seismic activity at the volcano, we use a multiparameter approach based on high time-resolution gas flux measurements and seismic data. The instrumentation includes 3 stationary NOVAC-type scanning Mini-DOAS spectrometers for the quantification of SO2 fluxes, installed at the volcano in March 2009, and 7 short period and broadband seismometers. This equipment complements the existing OVDAS (Observatorio Volcanológico de los Andes del Sur) volcano monitoring network. Based of the combination of gas and seismological measurements we aim at gaining insight into magmatic and volcano- tectonic processes, especially factors playing a role for the onset of volcanic unrest. Since the gas monitoring network has been installed at the volcano a correlation between SO2 emissions and seismic activity (LP events) has been recognized. We currently investigate a possible influence of regional tectonic activity on changes detected in degassing rates and seismicity, and consequently on volcanic activity.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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