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  • Weddell Sea  (4)
  • Electronic books.  (2)
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  • 1
    Schlagwort(e): Bioinformatics-Congresses. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (202 pages)
    Ausgabe: 1st ed.
    ISBN: 9783540699682
    Serie: Lecture Notes in Computer Science Series ; v.4360
    DDC: 570.285
    Sprache: Englisch
    Anmerkung: Intro -- Combining a High-Throughput Bioinformatics Grid andBioinformatics Web Services -- Introduction -- Materials and Methods -- Architecture -- Data Flow Implementation -- Results and Discussion -- Conclusion -- References -- Using Public Resource Computing and SystematicPre-calculation for Large Scale Sequence Analysis -- Introduction -- Public Resource Computing -- Systematic Pre-calculation of Sequence Analyses -- Systems and Methods -- Implementation -- BOINC Server -- BOINC Applications -- Results -- Performance of BOINC-Applications -- The BOINCSIMAP Project -- Conclusion -- Availability -- References -- Accelerated microRNA-Precursor DetectionUsing the Smith-Waterman Algorithm onFPGAs -- Introduction -- Previous Work -- FPGA in Bioinformatics -- Detecting microRNA Precursor Sequences with Smith-Waterman -- Scanning a Single Genomic Sequence -- Comparative Application -- Results -- Biological Relevance -- Interfacing of the Smith-Waterman Accelerator to LiSA -- Computational Performance -- Summary and Conclusion -- Implementation of a Distributed Architecture forManaging Collection and Dissemination of Data for FetalAlcohol Spectrum Disorders Research -- Introduction -- Distributed Nature of CIFASD -- Commitment to Data Integration -- Clinical Needs vs. Computer Science Research -- System Design -- Data Dictionaries -- Data Entry -- Central Repository and Data Flow -- Assuring Data Quality -- Reliable Infrastructure -- Results and Conclusions -- References -- Grid-Enabled High Throughput Virtual Screening -- Introduction -- Large Scale in Silico Docking Against Malaria -- Introduction -- Objectives -- In Silico Docking Against Avian Influenza -- Introduction -- Objectives -- The Grid Tools -- The Grid Infrastructures -- The WISDOM Production Environment -- The DIANE Framework -- Results -- WISDOM Results -- Perspectives. , Perspective on the Grid Side: WISDOM-II -- From Virtual Docking to Virtual Screening -- Conclusion -- References -- Grid Computing for the Estimation of Toxicity:Acute Toxicity onFathead Minnow (Pimephales promelas) -- Introduction -- Predictive Models for the Toxicity Prediction -- Grid Computing for Prediction Models -- Estimation of Acute Toxicity on Fathead Minnow -- Experimental Data -- Molecular Structures -- Molecular Descriptors -- Forward Selection of Descriptors to Multi-linear Regression -- Heuristic Back-Propagation Neural Networks for QSAR -- Results and Discussion -- Model Based on Multi-linear Regression -- Model Based on Artificial Neural Networks -- Comparison with Previously Published Models -- Conclusions -- Peer-to-Peer Experimentation in ProteinStructure Prediction: An Architecture,Experiment and Initial Results -- Introduction: Peer-to-Peer Experimentation -- Scientists as Peers in a Web Community -- Scientific Coordination as Peer-to-Peer Communication -- Experiment Implementation -- The MagentA Architecture -- Example Experiment: Consistency-Checking in Protein Structure Prediction -- 3-D Structural Models for Yeast Proteins -- Data Sources -- Processing/Pre-filtering of Data Sets -- Consistency-Checking -- Results and Discussion -- Conclusions and Future Work -- Gene Prediction in Metagenomic Libraries Usingthe Self Organising Map and High PerformanceComputing Techniques -- Introduction -- Rationale for the SOM -- The SOM -- Descriptor -- Analysis -- Parallel Approach -- MPI Implementation -- Annotation -- Results -- Conclusions -- A Distributed System for Genetic Linkage Analysis -- Introduction -- The Grid Execution Hierarchy Scheduling Algorithm -- Grid Execution Hierarchy -- Scheduling Tasks in Grid Hierarchy -- Handling Multiple Grids at the Same Level of the Execution Hierarchy. , Parallel Algorithm for the Computation of LOD Score -- Serial Algorithm -- Parallel Algorithm -- Implementation of the Parallel Algorithm for Execution in Grid Hierarchy -- Deployment of SUPERLINK-ONLINE -- Results -- Parallel Algorithm Performance -- Performance of the Grid Execution Hierarchy Scheduling Algorithm -- Related Work and Conclusions -- References -- Enabling Data Sharing and Collaboration inComplex Systems Applications -- Introduction -- Data Sharing Methods -- Objective -- An Example -- Characteristics of Our Network -- Resource Management and Grouping -- Security -- Scalability -- Performance -- Fairness -- Design Issues -- Content Storage and Management -- Network Structure -- Access Controls and Secure Storage -- Content Replication and Accountability -- Architecture and Implementation -- The Data -- The Database -- Database Interface -- User Interface Layer -- Practical Details -- Database Creation and Roles -- Security -- Installing and Connecting -- Performance -- Other Configuration Issues -- Conclusions -- Accessing Bio-databases with OGSA-DAI -A Performance Analysis -- Introduction -- OGSA-DAI -- Methods -- Results -- Hardware and Software Configuration -- Loading Data -- Retrieving Data -- Conclusion -- Systems Support for Remote Visualization of GenomicsApplications over Wide Area Networks -- Introduction -- System Overview -- Compressing 2-D Pixel Segments -- Basic Compression Algorithm -- Content-Based Anchoring of 2-D Pixel Segments -- An Optimization with Two-Level Fingerprinting -- Implementation -- Evaluation -- Experimental Testbed -- Network Communication Requirements -- Compression Results -- Related Work -- Conclusion -- References -- HVEM DataGrid: Implementation of a BiologicData Management System for Experiments withHigh Voltage Electron Microscope -- Introduction -- Related Works -- Background. , HVEM DataGrid System -- System Architecture and Design -- Schema of HVEM DataGrid -- Data Workflow -- Data Management and Access -- Data Search -- System Implementation -- Environmental Setup -- DataGrid Test -- Conclusion and Future Work.
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  • 2
    Online-Ressource
    Online-Ressource
    New York, NY :Springer,
    Schlagwort(e): Intelligent agents (Computer software). ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (158 pages)
    Ausgabe: 1st ed.
    ISBN: 9781461557395
    Serie: The Springer International Series in Engineering and Computer Science Series ; v.442
    DDC: 005.1/15
    Sprache: Englisch
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  • 3
    Publikationsdatum: 2021-10-13
    Beschreibung: The Filchner-Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a drastic increase in the future due to enhanced inflow of open-ocean warm water. Mooring observations from 2014 to 2016 along the eastern flank of the Filchner Trough (76°S) revealed a distinct seasonal cycle with inflow if Warm Deep Water during summer and autumn. Here we present extended time series showing an exceptionally warm and long inflow in 2017, with maximum temperatures exceeding 0.5°C. Warm temperatures persisted throughout winter, associated with a fresh anomaly, which lead to a change in stratification over the shelf, favoring an earlier inflow in the following summer. We suggest that the fresh anomaly developed upstream after anomalous summer sea ice melting and contributed to a shoaling of the shelf break thermocline.
    Schlagwort(e): 551.46 ; ocean-ice shelf interaction ; Weddell Sea ; warm inflow ; Antarctic Slope Front ; Filchner-Ronne Ice Shelf
    Sprache: Englisch
    Materialart: map
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  • 4
    Publikationsdatum: 2021-09-29
    Beschreibung: The Filchner‐Ronne Ice Shelf (FRIS) is characterized by moderate basal melt rates due to the near‐freezing waters that dominate the wide southern Weddell Sea continental shelf. We revisited the region in austral summer 2018 with detailed hydrographic and noble gas surveys along FRIS. The FRIS front was characterized by High Salinity Shelf Water (HSSW) in Ronne Depression, Ice Shelf Water (ISW) on its eastern flank, and an inflow of modified Warm Deep Water (mWDW) entering through Central Trough. Filchner Trough was dominated by Ronne HSSW‐sourced ISW, likely forced by a recently intensified circulation beneath FRIS due to enhanced sea ice production in the Ronne polynya since 2015. Glacial meltwater fractions and tracer‐based water mass dating indicate two separate ISW outflow cores, one hugging the Berkner slope after a two‐year travel time, and the other located in the central Filchner Trough following a ∼six year‐long transit through the FRIS cavity. Historical measurements indicate the presence of two distinct modes, in which water masses in Filchner Trough were dominated by either Ronne HSSW‐derived ISW (Ronne‐mode) or more locally derived Berkner‐HSSW (Berkner‐mode). While the dominance of these modes has alternated on interannual time scales, ocean densities in Filchner Trough have remained remarkably stable since the first surveys in 1980. Indeed, geostrophic velocities indicated outflowing ISW‐cores along the trough's western flank and onto Berkner Bank, which suggests that Ronne‐ISW preconditions Berkner‐HSSW production. The negligible density difference between Berkner‐ and Ronne‐mode waters indicates that each contributes cold dense shelf waters to protect FRIS against inflowing mWDW.
    Beschreibung: Plain Language Summary: We visited the largest floating Antarctic ice shelf in the southern Weddell Sea in 2018 with an icebreaker expedition, and measured ocean temperature, salinity, meltwater content, and other parameters in front of the FRIS. We found that the ocean conditions were still dominated by the very cold and dense waters needed to protect the ice shelf from inflowing warm waters from the deep ocean. We compared the 2018 conditions with earlier surveys since the 1980s and concluded that, in spite of climate change and in contrast to other Antarctic regions, the water masses on the southern Weddell Sea shelf remained relatively stable overall. We found that most of the stations we visited near the Filchner Ice Shelf edge were dominated by cold ISW, which forms when water masses interact with the underside of the shelf ice. Our measurements helped improve our understanding regarding the currents and water masses on the southern Weddell Sea continental shelf.
    Beschreibung: Key Points: Hydrographic status update with the first comprehensive CTD survey along the entire FRIS front since 1995. Strong and stable presence of High Salinity Shelf Water in Ronne Depression over decades. Dominance of Ronne‐sourced Ice Shelf Water in Filchner Trough in 2018 points to intensified sub‐FRIS circulation.
    Beschreibung: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) http://dx.doi.org/10.13039/501100003207
    Schlagwort(e): 551.46 ; Ocean circulation ; ocean‐ice shelf interaction ; water masses ; Weddell Sea ; Filcher and Ronne shelves
    Materialart: map
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  • 5
    Publikationsdatum: 2022-10-26
    Beschreibung: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Janout, M. A., Hellmer, H. H., Hattermann, T., Huhn, O., Sueltenfuss, J., Osterhus, S., Stulic, L., Ryan, S., Schroeder, M., & Kanzow, T. FRIS revisited in 2018: on the circulation and water masses at the Filchner and Ronne Ice Shelves in the Southern Weddell Sea. Journal of Geophysical Research: Oceans, 126(6), (2021): e2021JC017269, https://doi.org/10.1029/2021JC017269.
    Beschreibung: The Filchner-Ronne Ice Shelf (FRIS) is characterized by moderate basal melt rates due to the near-freezing waters that dominate the wide southern Weddell Sea continental shelf. We revisited the region in austral summer 2018 with detailed hydrographic and noble gas surveys along FRIS. The FRIS front was characterized by High Salinity Shelf Water (HSSW) in Ronne Depression, Ice Shelf Water (ISW) on its eastern flank, and an inflow of modified Warm Deep Water (mWDW) entering through Central Trough. Filchner Trough was dominated by Ronne HSSW-sourced ISW, likely forced by a recently intensified circulation beneath FRIS due to enhanced sea ice production in the Ronne polynya since 2015. Glacial meltwater fractions and tracer-based water mass dating indicate two separate ISW outflow cores, one hugging the Berkner slope after a two-year travel time, and the other located in the central Filchner Trough following a ∼six year-long transit through the FRIS cavity. Historical measurements indicate the presence of two distinct modes, in which water masses in Filchner Trough were dominated by either Ronne HSSW-derived ISW (Ronne-mode) or more locally derived Berkner-HSSW (Berkner-mode). While the dominance of these modes has alternated on interannual time scales, ocean densities in Filchner Trough have remained remarkably stable since the first surveys in 1980. Indeed, geostrophic velocities indicated outflowing ISW-cores along the trough's western flank and onto Berkner Bank, which suggests that Ronne-ISW preconditions Berkner-HSSW production. The negligible density difference between Berkner- and Ronne-mode waters indicates that each contributes cold dense shelf waters to protect FRIS against inflowing mWDW.
    Beschreibung: This study used samples and data provided by the Alfred Wegener Institute Helmholtz-Center for Polar- and Marine Research in Bremerhaven (Grant No. AWI-PS111_01). The authors thank Captain Schwarze and the crew of RV Polarstern for a very successful expedition. We acknowledge support from the EU Horizon 2020 grants 820575 (HHH, SØ) and 821001 (TK, SØ).
    Schlagwort(e): Ocean circulation ; Ocean-ice shelf interaction ; Water masses ; Weddell Sea ; Filcher and Ronne shelves
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
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  • 6
    Publikationsdatum: 2022-10-26
    Beschreibung: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Ryan, S., Hellmer, H. H., Janout, M., Darelius, E., Vignes, L., & Schroeder, M. Exceptionally warm and prolonged flow of warm deep water toward the Filchner-Ronne Ice Shelf in 2017. Geophysical Research Letters, 47(13),(2020): e2020GL088119, doi:10.1029/2020GL088119.
    Beschreibung: The Filchner‐Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a drastic increase in the future due to enhanced inflow of open‐ocean warm water. Mooring observations from 2014 to 2016 along the eastern flank of the Filchner Trough (76°S) revealed a distinct seasonal cycle with inflow if Warm Deep Water during summer and autumn. Here we present extended time series showing an exceptionally warm and long inflow in 2017, with maximum temperatures exceeding 0.5°C. Warm temperatures persisted throughout winter, associated with a fresh anomaly, which lead to a change in stratification over the shelf, favoring an earlier inflow in the following summer. We suggest that the fresh anomaly developed upstream after anomalous summer sea ice melting and contributed to a shoaling of the shelf break thermocline.
    Beschreibung: The authors would like to express their gratitude to the officers and crews of RV Polarstern (cruises PS92 [Grant AWI_PS82_02], PS96 [Grant AWI_PS96_01], and PS111 [Grant AWI_PS111_01]), RRS Ernest Shackleton (Cruise ES060), and RSS James Clark Ross (Cruise JR16004) for their efficient assistance. E. D. received funding from the project TOBACO (267660), POLARPROG, Norges Forskningsrd.
    Schlagwort(e): Ocean-ice shelf interaction ; Weddell Sea ; Warm inflow ; Antarctic Slope Front ; Filchner-Ronne Ice Shelf
    Repository-Name: Woods Hole Open Access Server
    Materialart: Article
    Standort Signatur Einschränkungen Verfügbarkeit
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