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    Assessing the Influence of the MJO on Strong Precipitation Events in Subtropical, Semi-Arid North-Central Chile (30°S)

    Source: Journal of Climate:;2012:;volume( 025 ):;issue: 020::page 7003
    Author:
    Juliá, Cristóbal
    ,
    Rahn, David A.
    ,
    Rutllant, José A.
    DOI: 10.1175/JCLI-D-11-00679.1
    Publisher: American Meteorological Society
    Abstract: nnual precipitation in subtropical, semiarid north-central Chile (30°S) during rainy years comprises a few (3?5) strong events in the fall and winter, which are presumably modulated by the Madden?Julian oscillation (MJO). Precipitation from 1979?2009 was recorded daily at three stations along the Elqui Valley. The relationship between the MJO and precipitation is investigated from two perspectives: 1) examining a MJO index (MJOI) based on the actual precipitation events and 2) examining the likelihood of precipitation based on a favorable MJOI. About 80% of the strong precipitation events at the coast in La Serena are related to an active MJO near the central equatorial Pacific. These events are often typified by broad, slow moving synoptic systems in phase with the MJO propagation. Blocking in the far southeast Pacific is associated with precipitation 75% of the time, while deep troughs make up the rest.A relationship between a MJOI and strong rainfall suggests that, though it could be used as a potential diagnostic, the number of cases where there is a favorable MJOI but no precipitation (i.e., false alarms) limits its utility. Additional criteria such as the Southern Oscillation (SO) and Antarctic Oscillation (AAO) phases were used to reject false alarms. Rejecting cases with positive values of the SO index reduced the number of false alarms from 70% to 58%, leaving about two false alarms for every correctly diagnosed event. The AAO index could not discriminate between false alarms and real cases. While a favorable MJOI increases the likelihood of precipitation in the Elqui Valley, false alarms remain problematic.
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      Assessing the Influence of the MJO on Strong Precipitation Events in Subtropical, Semi-Arid North-Central Chile (30°S)

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4222054
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    contributor authorJuliá, Cristóbal
    contributor authorRahn, David A.
    contributor authorRutllant, José A.
    date accessioned2017-06-09T17:05:41Z
    date available2017-06-09T17:05:41Z
    date copyright2012/10/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79291.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222054
    description abstractnnual precipitation in subtropical, semiarid north-central Chile (30°S) during rainy years comprises a few (3?5) strong events in the fall and winter, which are presumably modulated by the Madden?Julian oscillation (MJO). Precipitation from 1979?2009 was recorded daily at three stations along the Elqui Valley. The relationship between the MJO and precipitation is investigated from two perspectives: 1) examining a MJO index (MJOI) based on the actual precipitation events and 2) examining the likelihood of precipitation based on a favorable MJOI. About 80% of the strong precipitation events at the coast in La Serena are related to an active MJO near the central equatorial Pacific. These events are often typified by broad, slow moving synoptic systems in phase with the MJO propagation. Blocking in the far southeast Pacific is associated with precipitation 75% of the time, while deep troughs make up the rest.A relationship between a MJOI and strong rainfall suggests that, though it could be used as a potential diagnostic, the number of cases where there is a favorable MJOI but no precipitation (i.e., false alarms) limits its utility. Additional criteria such as the Southern Oscillation (SO) and Antarctic Oscillation (AAO) phases were used to reject false alarms. Rejecting cases with positive values of the SO index reduced the number of false alarms from 70% to 58%, leaving about two false alarms for every correctly diagnosed event. The AAO index could not discriminate between false alarms and real cases. While a favorable MJOI increases the likelihood of precipitation in the Elqui Valley, false alarms remain problematic.
    publisherAmerican Meteorological Society
    titleAssessing the Influence of the MJO on Strong Precipitation Events in Subtropical, Semi-Arid North-Central Chile (30°S)
    typeJournal Paper
    journal volume25
    journal issue20
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-11-00679.1
    journal fristpage7003
    journal lastpage7013
    treeJournal of Climate:;2012:;volume( 025 ):;issue: 020
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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