• Complex networks help explain extreme ra

    From ScienceDaily@1:317/3 to All on Tuesday, April 26, 2022 22:30:46
    Complex networks help explain extreme rainfall events
    Synchronization structure of extreme rainfall reveals how climate systems connect on a global scale

    Date:
    April 26, 2022
    Source:
    American Institute of Physics
    Summary:
    Researchers propose using a complex-network-based clustering
    workflow to search for synchronized structures of extreme rainfall
    events within the context of atmospheric chaos. By doing this, they
    were able to reconstruct a functional climate network to encode
    the underlying interaction of the climate system. Clusters on the
    network revealed regions of similar climatological behaviors. This
    means extreme rainfalls within different locations are not
    independent of each other but have a certain degree of similarity.



    FULL STORY ========================================================================== Precipitation extremes are very likely to become more frequent
    in most locations, according to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change released in February 2022. Thus, exploring extreme rainfall patterns -- occurrences of natural hazards
    like floods or landslides - - on a global scale is elevated to an issue
    of great societal importance.


    ========================================================================== InChaos, from AIP Publishing, researchers in Germany propose using a
    complex- network-based clustering workflow to search for synchronized structures of extreme rainfall events within the context of atmospheric
    chaos.

    By doing this, they were able to reconstruct a functional climate network
    to encode the underlying interaction of the climate system. Clusters on
    the network revealed regions of similar climatological behaviors.

    For example, monsoons describe atmospheric circulation seasonal changes,
    and while they are distributed on different continents, their occurrences
    are usually accompanied by precipitation extremes.

    "Although global-scale atmospheric circulation within the tropics
    and subtropics forms connections between different monsoons, they are essentially driven, synchronized, and coordinated by the annual cycle of
    solar radiation," said Zhen Su at Potsdam Institute for Climate Impact
    Research and Humboldt Universita"t zu Berlin. "Synchronization can also
    occur between extreme rainfalls, even when they are not occurring within monsoon regions." This means extreme rainfalls within different locations
    are not independent of each other but have a certain degree of similarity.

    "In this regard, it still remains unclear what the global-scale
    synchronization pattern of extreme rainfall will look like, for example,
    during the summer season of the Northern Hemisphere," Su said. "We aim
    to find the answer from observational precipitation data." The global synchronization of extreme rainfall has two main distributions with
    independent temporal and spatial characteristics. "One occurs mainly
    from early June to mid-July," said Su. "The other happens primarily from mid-July to late August." Between these periods, a monsoon "jump" occurs
    -- a northward movement of the rain belt of monsoons with time. With
    this monsoon jump, the spatial distribution of synchronization also
    undergoes a northward shift. The researchers noticed both of the spatial distributions cover monsoon regions and also oceanic and inland areas.

    "The synchronization structure of extreme rainfall tells us how the
    climate system is interconnected on a global scale," said Su. "It also
    provides insights for improving corresponding interaction processes in
    general circulation models, which are mostly used for estimating the
    state of our future climate."

    ========================================================================== Story Source: Materials provided by American_Institute_of_Physics. Note: Content may be edited for style and length.


    ========================================================================== Journal Reference:
    1. Zhen Su, Henning Meyerhenke, Ju"rgen Kurths. The climatic
    interdependence
    of extreme-rainfall events around the globe. Chaos: An
    Interdisciplinary Journal of Nonlinear Science, 2022; 32 (4):
    043126 DOI: 10.1063/5.0077106 ==========================================================================

    Link to news story: https://www.sciencedaily.com/releases/2022/04/220426153701.htm

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