Library Portal | UWC Portal | National ETDs | Global ETDs
    • Login
    Contact Us | About Us | FAQs | Login
    View Item 
    •   DSpace Home
    • Faculty of Natural Sciences
    • Biodiversity & Conservation Biology
    • Research Articles (Bioversity and Conservation Biology)
    • View Item
    •   DSpace Home
    • Faculty of Natural Sciences
    • Biodiversity & Conservation Biology
    • Research Articles (Bioversity and Conservation Biology)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Predominant atmospheric and oceanic patterns during coastal marine heatwaves

    Thumbnail
    View/Open
    Schlegel_predominant-atmospheric_2017.pdf (4.259Mb)
    Date
    2017
    Author
    Schlegel, Robert W.
    Oliver, Eric C. J.
    Perkins-Kirkpatrick, Sarah
    Kruger, Andries
    Metadata
    Show full item record
    Abstract
    As the mean temperatures of the worlds oceans increase, it is predicted that marine heatwaves (MHWs) will occur more frequently and with increased severity. However, it has been shown that variables other than increases in sea water temperature have been responsible for MHWs. To better understand these mechanisms driving MHWs we have utilized atmospheric (ERA-Interim) and oceanic (OISST, AVISO) data to examine the patterns around southern Africa during coastal (<400 m from the low water mark; measured in situ) MHWs. Nonmetric multidimensional scaling (NMDS) was first used to determine that the atmospheric and oceanic states during MHW are different from daily climatological states. Self-organizing maps (SOMs) were then used to cluster the MHW states into one of nine nodes to determine the predominant atmospheric and oceanic patterns present during these events. It was found that warmwater forced onto the coast via anomalous ocean circulation was the predominant oceanic pattern during MHWs. Warm atmospheric temperatures over the subcontinent during onshore or alongshore winds were the most prominent atmospheric patterns. Roughly one third of the MHWs were clustered into a node with no clear patterns, which implied that they were not forced by a recurring atmospheric or oceanic state that could be described by the SOManalysis. Because warm atmospheric and/or oceanic temperature anomalies were not the only pattern associated withMHWs, the current trend of a warming earth does not necessarily mean that MHWs will increase apace; however, aseasonal variability in wind and current patterns was shown to be central to the formation of coastal MHWs, meaning that where climate systems shift from historic records, increases in MHWs will likely occur.
    URI
    http://dx.doi.org/10.3389/fmars.2017.00323
    http://hdl.handle.net/10566/3260
    Collections
    • Research Articles (Bioversity and Conservation Biology)

    DSpace 6.3 | Ubuntu | Copyright © University of the Western Cape
    Contact Us | Send Feedback
    Theme by 
    Atmire NV
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    Login

    Statistics

    View Usage Statistics

    DSpace 6.3 | Ubuntu | Copyright © University of the Western Cape
    Contact Us | Send Feedback
    Theme by 
    Atmire NV