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    Author(s): Lejiang Yu; Warren E. Heilman; Shiyuan Zhong; Xindi Bian
    Date: 2017
    Source: Atmospheric Science Letters
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (29.0 MB)

    Description

    We used 35-year (1979–2013) hourly rainfall data from theNorth American LandData Assimilation System (NLDAS-2) to examine the relationships of the symmetric and asymmetric components of two types of El Niño-Southern Oscillation (ENSO) (El Niño and ElNiño Modoki) episodes with occurrences of extreme precipitation events across the United States. During the cold season, the symmetric impacts of El Niño and El Niño Modoki are more significant than during the warm season. The asymmetric components associated with El Niño during the two seasons are comparable, while the asymmetric components associated with El Niño Modoki during the warm season are more significant than those during the cold season. The connections between the symmetric and asymmetric components of the two types of ENSO and extreme precipitation occurrences are related to atmospheric moisture convergence patterns that tend to occur in response to the anomalous large-scale atmospheric circulations during the ENSO episodes.

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    Citation

    Yu, Lejiang; Heilman, Warren E.; Zhong, Shiyuan; Bian, Xindi. 2017. Relationships of the symmetric and asymmetric components of ENSO to US extreme precipitation. Atmospheric Science Letters. 18(12): 466-474. https://doi.org/10.1002/asl.790.

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    Keywords

    El Niño, ElNiño Modoki, extreme precipitation events, teleconnections, nonlinearity

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