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    Large-Scale Flow Patterns Associated with Extreme Precipitation and Atmospheric Rivers over Norway

    Source: Monthly Weather Review:;2019:;volume 147:;issue 004::page 1415
    Author:
    Benedict, Imme
    ,
    Ødemark, Karianne
    ,
    Nipen, Thomas
    ,
    Moore, Richard
    DOI: 10.1175/MWR-D-18-0362.1
    Publisher: American Meteorological Society
    Abstract: AbstractA climatology of extreme cold season precipitation events in Norway from 1979 to 2014 is presented, based on the 99th percentile of the 24-h accumulated precipitation. Three regions, termed north, west, and south are identified, each exhibiting a unique seasonal distribution. There is a proclivity for events to occur during the positive phase of the NAO. The result is statistically significant at the 95th percentile for the north and west regions. An overarching hypothesis of this work is that anomalous moisture flux, or so-called atmospheric rivers (ARs), are integral to extreme precipitation events during the Norwegian cold season. An objective analysis of the integrated vapor transport illustrates that more than 85% of the events are associated with ARs. An empirical orthogonal function and fuzzy cluster technique is used to identify the large-scale weather patterns conducive to the moisture flux and extreme precipitation. Five days before the event and for each of the three regions, two patterns are found. The first represents an intense, southward-shifted jet with a southwest?northeast orientation. The second identifies a weak, northward-shifted, zonal jet. As the event approaches, regional differences become more apparent. The distinctive flow pattern conducive to orographically enhanced precipitation emerges in the two clusters for each region. For the north and west regions, this entails primarily zonal flow impinging upon the south?north-orientated topography, the difference being the latitude of the strong flow. In contrast, the south region exhibits a significant southerly component to the flow.
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      Large-Scale Flow Patterns Associated with Extreme Precipitation and Atmospheric Rivers over Norway

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    contributor authorBenedict, Imme
    contributor authorØdemark, Karianne
    contributor authorNipen, Thomas
    contributor authorMoore, Richard
    date accessioned2019-10-05T06:55:28Z
    date available2019-10-05T06:55:28Z
    date copyright2/14/2019 12:00:00 AM
    date issued2019
    identifier otherMWR-D-18-0362.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263848
    description abstractAbstractA climatology of extreme cold season precipitation events in Norway from 1979 to 2014 is presented, based on the 99th percentile of the 24-h accumulated precipitation. Three regions, termed north, west, and south are identified, each exhibiting a unique seasonal distribution. There is a proclivity for events to occur during the positive phase of the NAO. The result is statistically significant at the 95th percentile for the north and west regions. An overarching hypothesis of this work is that anomalous moisture flux, or so-called atmospheric rivers (ARs), are integral to extreme precipitation events during the Norwegian cold season. An objective analysis of the integrated vapor transport illustrates that more than 85% of the events are associated with ARs. An empirical orthogonal function and fuzzy cluster technique is used to identify the large-scale weather patterns conducive to the moisture flux and extreme precipitation. Five days before the event and for each of the three regions, two patterns are found. The first represents an intense, southward-shifted jet with a southwest?northeast orientation. The second identifies a weak, northward-shifted, zonal jet. As the event approaches, regional differences become more apparent. The distinctive flow pattern conducive to orographically enhanced precipitation emerges in the two clusters for each region. For the north and west regions, this entails primarily zonal flow impinging upon the south?north-orientated topography, the difference being the latitude of the strong flow. In contrast, the south region exhibits a significant southerly component to the flow.
    publisherAmerican Meteorological Society
    titleLarge-Scale Flow Patterns Associated with Extreme Precipitation and Atmospheric Rivers over Norway
    typeJournal Paper
    journal volume147
    journal issue4
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR-D-18-0362.1
    journal fristpage1415
    journal lastpage1428
    treeMonthly Weather Review:;2019:;volume 147:;issue 004
    contenttypeFulltext
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