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  • 1
    Online Resource
    Online Resource
    Walker Circulation response to global warming (2013)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (53 Blatt = 3 MB)
    URL: https://oceanrep.geomar.de/22988
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 2
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    Water column N2O concentrations during SONNE cruise SO235 (2019)
    PANGAEA
    Details
    Publication Date: 2024-01-27
    Description: Depth profiles of nitrous oxide (N2O) concentrations during the SO235 cruise.
    Keywords: Arabian Sea; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Event label; Indian Ocean; LATITUDE; LONGITUDE; Nitrous oxide, dissolved; OASIS; Oxygen; Salinity; Sample code/label; SO235; SO235_01-1; SO235_02-1; SO235_04-1; SO235_07-1; SO235_08-1; SO235_09-1; SO235_10-2; SO235_11-1; SO235_13-1; SO235_15-1; Sonne; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 735 data points
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    DATA PANGAEA
  • 3
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    Sensitivity of the northern hemisphere polar vortex to the solar cycle, the Quasi-Biennial Oscillation and the El Nino-Southern Oscillation (2016)
    In:  (Master thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, vii, 74, XXVII pp
    Details
    Publication Date: 2019-09-23
    Keywords: Course of study: MSc Climate Physics
    Type: Thesis , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Thesis - not published by a publisher
  • 4
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    Obenflächendynamik von CO2, N2O, DMS und Isopren im Indischen Ozean (2015)
    In:  [Paper] In: Statusseminar Meeresforschung mit FS SONNE 2015, 12.-13.02.2015, Bremen, Germany . Tagungsband Statusseminar Meeresforschung mit FS SONNE 2015 ; pp. 236-238 .
    Details
    Publication Date: 2015-05-04
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    OceanRep: Conference paper
  • 5
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    Nitrous oxide in the Southwest Indian Ocean (2017)
    In:  [Talk] In: Good Hope for Earth Science - 2017 Joint IAPSO-IAMAS-IAGA Assembly, 27.08.-01.09.2017, Cape Town, South Africa .
    Details
    Publication Date: 2019-09-23
    Description: The southwestern basin of the Indian Ocean (SWIO) remains a rather under-sampled region with regards to nitrogen cycle processes. Here we present the results of extensive surface and water column nitrous oxide (N2O) measurements as well as the first reported open ocean measurements of hydroxylamine (NH2OH). Wind-driven upwelling in the zonal band between 5°S and 10°S led to an enhanced efflux of N2O to the atmosphere with saturation values up to 122% and a maximum sea-to-air flux of 2.3 nmol m-2 s-1. N2O depth profiles showed supersaturation conditions throughout the water column with a distinct maximum (~ 30 nmol L-1) at about 1000 m. Excess N2O (ΔN2O) was positively correlated with apparent oxygen utilization (AOU) and nitrate concentrations although different slopes of the ΔN2O/AOU relationships could be identified above and below the concentration maxima. Although the vertical distribution of NH2OH was highly variable, combined analysis with N2O and nutrient data suggests nitrification as the major formation pathway of N2O in the SWIO. Our observations suggest that the SWIO is a rather weak, yet, perennial source of atmospheric N2O which should be considered in future efforts aiming to long-term monitoring of greenhouse gases in the Indian Ocean.
    Type: Conference or Workshop Item , NonPeerReviewed , info:eu-repo/semantics/conferenceObject
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    OceanRep: Talk
  • 6
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    Nitrous oxide and hydroxylamine measurements in the Southwest Indian Ocean (2020)
    Elsevier
    Details
    Publication Date: 2023-09-19
    Description: Highlights: • Enhanced surface N2O saturations were found between 5°S and 10°S in the SWIO. • The SWIO was a rather weak source of N2O to the atmosphere. • A distinct N2O maximum was found at about 1000 m. • The distributions of NH2OH in the water column were highly variable. • Nitrification was the major formation pathway of N2O in the SWIO. The southwestern basin of the Indian Ocean (SWIO) remains a rather under-sampled region with regard to nitrogen-cycle processes. Here we present the results of extensive nitrous oxide (N2O) measurements as well as the first reported open ocean measurements of hydroxylamine (NH2OH). Enhanced N2O sea-to-air fluxes were found in the zonal band between 5°S and 10°S as a result of wind-driven upwelling, and N2O depth profiles showed supersaturation throughout the water column with a distinct maximum at about 1000 m. Excess N2O (ΔN2O) was found to be positively correlated with apparent oxygen utilization (AOU) and nitrate. Although the water column distribution of NH2OH was highly variable, combined analysis with N2O and nutrient data allows us to argue for nitrification as the major formation pathway of N2O in the SWIO.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Walker Circulation response to global warming (2013)
    Details
    Publication Date: 2023-07-26
    Description: The structure and variance of the Walker Circulation is analyzed by examining 21 models of the Coupled Model Intercomparison Project Phase 5 (CMIP5) and 24 models of Phase 3 (CMIP3). In this study the equatorial zonal circulation is characterized by a zonal pressure gradient in combination with a surface temperature gradient across the Pacific. The climate models in this study include twentieth century and twenty-first century simulations. Several authors characterized the circulation intensity by setting an index derived by a zonal difference of spatial means. The variability of the Walker Circulation measured by the indices according to recent studies is analyzed in this study. A connection between the temperature and pressure gradient can be seen and most models indicate a weakening trend in the twenty-first century. Nevertheless the signal of global warming is too weak to be detected. No significant outcome can be obtained by any of the chosen indices which suggests that different meteorological parameters might be more meaningful to gain clearer evidence for the Walker Circulation variability. Future projections are characterized by high uncertainty which is mostly due to model uncertainty. The climate models presented here illustrate the Walker Circulation variability unequally when using the defined measure of the Walker Circulation intensity. Hence the definition of an index needs to be reconsidered and an improvement of climate models reproducing atmospheric circulation variability still remains to be a focus of current research.
    Keywords: Course of study: BSc Physics of the Earth System
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
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