ENSO Transition from La Niña to El Niño Drives Prolonged Spring–Summer Drought over North ChinaSource: Journal of Climate:;2018:;volume 031:;issue 009::page 3509DOI: 10.1175/JCLI-D-17-0440.1Publisher: 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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contributor author | Zhang, Lixia | |
contributor author | Wu, Peili | |
contributor author | Zhou, Tianjun | |
contributor author | Xiao, Chan | |
date accessioned | 2019-09-19T10:09:23Z | |
date available | 2019-09-19T10:09:23Z | |
date copyright | 2/12/2018 12:00:00 AM | |
date issued | 2018 | |
identifier other | jcli-d-17-0440.1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4262169 | |
description 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. | |
publisher | American Meteorological Society | |
title | ENSO Transition from La Niña to El Niño Drives Prolonged Spring–Summer Drought over North China | |
type | Journal Paper | |
journal volume | 31 | |
journal issue | 9 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-17-0440.1 | |
journal fristpage | 3509 | |
journal lastpage | 3523 | |
tree | Journal of Climate:;2018:;volume 031:;issue 009 | |
contenttype | Fulltext |