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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 26 (1987), S. 7378-7384 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 47 (1896), S. 281-297 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 45 (1894), S. 371-380 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2023-08-30
    Description: The Seychelles-Chagos Thermocline Ridge (SCTR) is a biologically important region of open ocean upwelling within the south west Indian Ocean (5-10°S and 45-90°E). The SCTR refers to an elongated feature which joins two local minima in thermocline depth; the Seychelles Dome (SD) and Chagos Domes (CD). We present the seasonality and physical drivers of the surface chl-a bloom for both the western (SD) and eastern (CD) extremes of the SCTR, using in situ observations and remotely sensed data. We find the buoyancy fluxes from the Indonesian Though Flow (ITF) strongly impacts surface chl-a concentrations over the CD. Here a significant correlation (r=0.33) was found between the altimeter-derived strength of the IFT and the surface chl-a concentrations. This correlation increases (r=0.58) when only the 90th percentile ITF events are considered, indicating the influence of the ITF may be overcoming other physical drivers for these years. We hypothesise the buoyancy flux of a strong ITF input suppresses the thermocline and ‘caps’ the CD with warm, less saline waters. This hypothesis is supported following a strong, significant relationship (r=0.66) between remotely sensed surface salinity and surface chl-a over the CD. This relationship is not found over the SD, where the ITF has a weaker direct impact over the bloom. The results suggest that the ITF may be an important factor for surface chl-a within the SCTR over longer-term time scales. Idealised model experiments will be used to investigate the relationship between the IFT and the spatio-temporal variability chl-a within the SCTR.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-07-18
    Description: The UN’s Decade of Ocean Science (in particular SDG 4 and 14) calls for programmes that improve scientific knowledge, develop research capacities and transfer marine technological information and expertise across generations. In South Africa, the Department of Science and Innovation’s (DSI) has already taken a significant step forward in such training measures. The current DSI Global Change Grand Challenge programme calls for platforms that “attract young researchers and retain them by exciting their interest in aspects of global change, while developing their capacity and professional skills in the relevant fields of investigation”. To meet these challenges in the Ocean Sciences, SEAmester – South Africa’s Floating University and a joint initiative between Government and Universities was started in 2016. The strength of SEAmester is that South African postgraduate students combine theoretical classroom learning with the application of this knowledge through ship-based, and more importantly, hands-on research through the Agulhas System Climate Array (ASCA) programme. Now into its 6th year, SEAmester has already made significant progress in ship-based training with over 210 students from 23 South African universities participating in these training cruises. This presentation will examine the development of this programme, its success as well as its challenges and most importantly, what has become of the past SEAmester students.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 6
    Publication Date: 2024-05-30
    Description: Challenge 9 aims to ensure comprehensive capacity development and equitable access to data, information, knowledge, technology, and participatory decision-making across all aspects of ocean science and for all stakeholders. It is based on the understanding that everyone has something to contribute through shared knowledge, resources, ideas, or partnerships. Challenge 9 therefore is focused on equity and justice in access to capacity, resources, and decision making. By 2030, success for Ocean Decade Challenge 9 will be reached when: Technical, transdisciplinary, and transversal skills required by scientists, resource users, educators, communicators, managers, and policymakers, to deliver the Decade’s challenges, are strengthened and evenly distributed with an emphasis on least developed countries (LDCs) and Small Island Developing States (SIDS) and other under-represented groups. Funding mechanisms, multi-directional partnerships, multi-directional partnerships, infrastructure, and technology required to deliver the Decade’s challenges across regions and communities are enhanced and evenly distributed with emphasis on promoting access to LDCs and SIDS and on promoting greater cooperation between regions. Users and stakeholders from currently under-represented groups (i.e., women; ECOPs; Indigenous communities; LDCs and SIDS; people with disabilities; and others) are well-represented and participatory in ocean science, communication, management, decision making, and policy within the Decade framework. Wider promotion of ethically-driven actions and access to open-source software, ocean data, knowledge, and information among different users of the ocean has been achieved, and language barriers/restrictions have been mediated, including sharing knowledge in forms that are well articulated by non-scientific audiences. Recognition for Indigenous and local knowledge and traditional beliefs that promote conservation receives backing by the Decade and is integrated into all the Decade challenges. Success will include fulfilment of the following critical capacity development needs: skills enhancement; representation and meaningful participation; equitable funding; infrastructure; technology; access to data and information; publishing of research findings; better representation of scientists and knowledge from LDCs, SIDS and other under-represented groups in international publications and decision-making bodies and procedures; and promotion of the use of multiple languages in ocean science communication.
    Description: Published
    Description: Refereed
    Keywords: Capacity development ; Under-represented groups ; Least Developed Countries (LDC) ; Equitable access ; Open access ; Small Island Developing States (SIDS)
    Repository Name: AquaDocs
    Type: Report
    Format: 28pp.
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  • 7
    Publication Date: 2024-05-30
    Description: By 2030, successful achievement of Ocean Decade Challenge No. 6 will require demonstrating substantial advancements within the global community towards enhancing their resilience to coastal and ocean hazards. This includes implementing two crucial elements: (1) establishing comprehensive 'people-centered' early warning systems capable of addressing multiple hazards, and (2) devising adaptation strategies that specifically target risks associated with the ocean, including those linked to climate change. These endeavours will play a pivotal role in guiding sustainable practices in ocean planning. Success will also hinge on addressing critical gaps in scientific understanding and knowledge across important components such as risk assessment and risk reduction, in addition to putting in place robust institutional mechanisms for implanting novel solutions that contribute to coastal resilience. Some key elements to be addressed in this context include: (i) gathering and generating observational and modelling datasets relevant to risk assessment, including downscaled climate scenarios for coastal regions, within robust data-sharing frameworks; (ii) promoting interdisciplinary and international research and innovation to tackle challenges comprehensively, with a focus on methodologies like Digital Twin approaches; (iii) improving standards for risk communication at both national and international levels; (iv) fostering partnerships at various scales involving local communities, public and private disaster risk reduction entities, governmental bodies, and academic institutions; (v) building capacity in research and communication to cultivate a shared understanding of coastal resilience strategies; and (vi) enhancing resilient infrastructure and promoting sustainable resource management along coastlines. It is imperative to establish partnerships with existing international UN programs dedicated to disaster risk reduction and coastal resilience. Strengthening connections with UN Decade Actions through Decade Coordination Offices and Decade Collaboration Centers is of utmost importance for effective coordination and collaboration. Based on the above strategic ambition it is also suggested that the formulation of the Ocean Decade Challenge could be modified as follows: Increase community resilience to ocean and coastal risks
    Description: Published
    Description: Refereed
    Keywords: Coastal resilience ; Coastal zone management ; Hazard warning system ; Risk assessement ; Ocean hazards
    Repository Name: AquaDocs
    Type: Report
    Format: 37pp.
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  • 8
    Publication Date: 2015-11-09
    Type: Article , NonPeerReviewed
    Format: text
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  • 9
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    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 50 (1). pp. 281-298.
    Publication Date: 2020-08-05
    Description: Exchanges of water south of Africa between the South Indian Ocean and the South Atlantic Ocean are an important component of the global thermohaline circulation. Evidence exists that the variability in these exchanges, on both meso- and longer time scales, may significantly influence weather and climate patterns in the southern African region and the significance of these regional ocean–atmosphere interactions is discussed. Observations of the inter-ocean exchange are limited and it is necessary to augment these with estimates derived from models. As a first step in this direction, this study uses an eddy-permitting model to investigate the heat and volume transport in the oceanic region south of Africa and its variability on meso, seasonal and inter-annual time scales. On the annual mean, about Full-size image (〈1 K) (standard deviation Full-size image (〈1 K)) of heat flows west into the South Atlantic across 20°E (longitude of Cape Agulhas, the southernmost point of Africa), with just over Full-size image (〈1 K) (standard deviation Full-size image (〈1 K)) flowing north into the South Atlantic across 35°S. The seasonal variations in this transport are about 10% at 35°S in the South Atlantic and around 20% through 20°E; the model value of Full-size image (〈1 K) for summer (standard deviation ranging from Full-size image (〈1 K) in January to Full-size image (〈1 K) in March) appears consistent with respective estimates of 0.51 and Full-size image (〈1 K) derived from two WOCE summer cruises southwest of Cape Town to 45°S in 1990 and 1993. Volume transports of the Agulhas Current section through 35°S in the SW Indian Ocean range from 58 to Full-size image (〈1 K) in summer/autumn to 64–Full-size image (〈1 K) in winter/spring. The model results suggest that the inter-ocean exchange south of Africa is highly variable on seasonal through to interannual scales. If this variability is also the case in the real ocean (and the limited observations suggest that this is so), then there are likely to be significant implications for climate.
    Type: Article , PeerReviewed
    Format: text
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  • 10
    Publication Date: 2023-02-08
    Description: The South-East Madagascar Bloom, one of the most compelling biogeochemical features of the Indian Ocean, occurs sporadically during austral summer in the oligotrophic waters south-east of Madagascar, where it can cover up to 1% of the global ocean surface area. Its spatial extension and its timing are highly variable. A high-resolution biophysical model is used to investigate a previous hypothesis that the onset of a particular circulation of the South-East Madagascar Current advects fresher and nutrient-rich waters eastward, feeding the bloom. The model is able to reproduce an intermittent phytoplankton bloom with large spatial variability but in the subsurface layers, as well as the presence of an irregular retroflection of the South-East Madagascar Current. The simulated bloom occurs within a shallow stratified mixed layer, with fresher waters at the surface, parallel to the water mass in an observed bloom. The model results suggest, from a nutrient flux analysis, that horizontal advection of low-salinity nutrient-rich Madagascan coastal waters can indeed trigger a phytoplankton bloom. The coupled model is also able to resolve a bloom that is atmospherically forced by cyclonic activity.
    Type: Article , PeerReviewed
    Format: text
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