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    ENSO Transition from La Niña to El Niño Drives Prolonged Spring–Summer Drought over North China

    Source: Journal of Climate:;2018:;volume 031:;issue 009::page 3509
    Author:
    Zhang, Lixia
    ,
    Wu, Peili
    ,
    Zhou, Tianjun
    ,
    Xiao, Chan
    DOI: 10.1175/JCLI-D-17-0440.1
    Publisher: American Meteorological Society
    Abstract: AbstractPersistent drought is a major meteorological disaster causing vast agricultural damage and long-term regional water crises. Over north China, this type of drought tends to begin in spring and to persist until summer with severe societal impacts. This paper aims to identify the large-scale dynamic drivers of the prolonged spring?summer drought (PSSD) over north China. This analysis has shown that the north China PSSD is associated with a persistent anomalous low-level cyclonic circulation spanning the midlatitude North Pacific from spring to summer with reduced moisture transport to north China, in combination with a tropospheric cooling along the East Asian upper-level westerly jet with dynamically forced anomalous descent above. Seven of the selected eight north China PSSD events occurred when La Niña transitioned to El Niño with a negative North Pacific Oscillation (NPO) phase in the preceding winter. The two key circulation anomalies in spring are set directly by a negative NPO phase generated in the preceding winter. The NPO, in turn, forces an El Niño onset in summer through the so-called seasonal footprinting mechanism. Consequently, sea surface temperature anomalies of El Niño in summer suppress Indian monsoon rainfall, triggering the tropospheric temperature cooling over East Asia through a circumglobal teleconnection along the East Asian upper-level westerly jet. Modeling analysis of the long preindustrial control simulation confirms the above findings. This study demonstrates that ENSO phase transition from La Niña to El Niño is one of the important precursors of north China PSSD.
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      ENSO Transition from La Niña to El Niño Drives Prolonged Spring–Summer Drought over North China

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    contributor authorZhang, Lixia
    contributor authorWu, Peili
    contributor authorZhou, Tianjun
    contributor authorXiao, Chan
    date accessioned2019-09-19T10:09:23Z
    date available2019-09-19T10:09:23Z
    date copyright2/12/2018 12:00:00 AM
    date issued2018
    identifier otherjcli-d-17-0440.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262169
    description abstractAbstractPersistent drought is a major meteorological disaster causing vast agricultural damage and long-term regional water crises. Over north China, this type of drought tends to begin in spring and to persist until summer with severe societal impacts. This paper aims to identify the large-scale dynamic drivers of the prolonged spring?summer drought (PSSD) over north China. This analysis has shown that the north China PSSD is associated with a persistent anomalous low-level cyclonic circulation spanning the midlatitude North Pacific from spring to summer with reduced moisture transport to north China, in combination with a tropospheric cooling along the East Asian upper-level westerly jet with dynamically forced anomalous descent above. Seven of the selected eight north China PSSD events occurred when La Niña transitioned to El Niño with a negative North Pacific Oscillation (NPO) phase in the preceding winter. The two key circulation anomalies in spring are set directly by a negative NPO phase generated in the preceding winter. The NPO, in turn, forces an El Niño onset in summer through the so-called seasonal footprinting mechanism. Consequently, sea surface temperature anomalies of El Niño in summer suppress Indian monsoon rainfall, triggering the tropospheric temperature cooling over East Asia through a circumglobal teleconnection along the East Asian upper-level westerly jet. Modeling analysis of the long preindustrial control simulation confirms the above findings. This study demonstrates that ENSO phase transition from La Niña to El Niño is one of the important precursors of north China PSSD.
    publisherAmerican Meteorological Society
    titleENSO Transition from La Niña to El Niño Drives Prolonged Spring–Summer Drought over North China
    typeJournal Paper
    journal volume31
    journal issue9
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-17-0440.1
    journal fristpage3509
    journal lastpage3523
    treeJournal of Climate:;2018:;volume 031:;issue 009
    contenttypeFulltext
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