Dominant Process for Northward Propagation of Boreal Summer Intraseasonal Oscillation Over the Western North Pacific

Young Min Yang; June Yi Lee; Bin Wang

doi:10.1029/2020GL089808

Dominant Process for Northward Propagation of Boreal Summer Intraseasonal Oscillation Over the Western North Pacific

Young Min Yang
, June Yi Lee
, Bin Wang

Computational Earth Sciences Group

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Northward propagation of boreal summer intraseasonal oscillation (BSISO) over the Western North Pacific (WNP) has significant impacts on extreme events over Asia and Europe. Here we test hypotheses that northward propagation mechanisms over the WNP may differ from those over the Indian Ocean (IO) by performing numerical experiments with changing mean states through lowering the Tibetan Plateau (TP). Our results suggest that air-sea interaction plays a dominant role in the propagation over the WNP, whereas the mean vertical wind shear mechanism is the major driver over the IO. Lowering TP significantly reduces sea surface temperature (SST) anomalies to the north of BSISO center due to the enhanced surface wind and latent heat flux anomalies. This air-sea interaction reduces upward transport of heat and moisture from surface to lower troposphere, weakening the northward propagation over the WNP. This study implies changes in SST patterns under global warming may influence BSISO propagation.

Original language	English
Article number	e2020GL089808
Journal	Geophysical Research Letters
Volume	47
Issue number	22
DOIs	https://doi.org/10.1029/2020GL089808
State	Published - Nov 28 2020

Funding

This work is funded by the National Key Research and Development Program of China (Grant No. 2016YFA0600401) and the National Natural Science Foundation of China (Grant No. 41420104002) as well as the National Science Foundation (Climate Dynamics Division) Award No. AGS‐1540783. This is the Earth System Modeling Center (ESMC) publication no. XXX. J.‐Y. Lee acknowledges the support from the Institute for Basic Science (project code IBS‐R028‐D1) and the National Research Foundation (NRF‐2019R1I1A3A0105829) in Korea. This work is funded by the National Key Research and Development Program of China (Grant No. 2016YFA0600401) and the National Natural Science Foundation of China (Grant No. 41420104002) as well as the National Science Foundation (Climate Dynamics Division) Award No. AGS-1540783. This is the Earth System Modeling Center (ESMC) publication no. XXX. J.-Y. Lee acknowledges the support from the Institute for Basic Science (project code IBS-R028-D1) and the National Research Foundation (NRF-2019R1I1A3A0105829) in Korea.

Keywords

air-sea interaction
boreal summer intraseasonal oscillation
northward propagation
the Tibetan Plateau
the Western North Pacific

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10.1029/2020GL089808

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title = "Dominant Process for Northward Propagation of Boreal Summer Intraseasonal Oscillation Over the Western North Pacific",

abstract = "Northward propagation of boreal summer intraseasonal oscillation (BSISO) over the Western North Pacific (WNP) has significant impacts on extreme events over Asia and Europe. Here we test hypotheses that northward propagation mechanisms over the WNP may differ from those over the Indian Ocean (IO) by performing numerical experiments with changing mean states through lowering the Tibetan Plateau (TP). Our results suggest that air-sea interaction plays a dominant role in the propagation over the WNP, whereas the mean vertical wind shear mechanism is the major driver over the IO. Lowering TP significantly reduces sea surface temperature (SST) anomalies to the north of BSISO center due to the enhanced surface wind and latent heat flux anomalies. This air-sea interaction reduces upward transport of heat and moisture from surface to lower troposphere, weakening the northward propagation over the WNP. This study implies changes in SST patterns under global warming may influence BSISO propagation.",

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T1 - Dominant Process for Northward Propagation of Boreal Summer Intraseasonal Oscillation Over the Western North Pacific

AU - Yang, Young Min

AU - Lee, June Yi

AU - Wang, Bin

PY - 2020/11/28

Y1 - 2020/11/28

N2 - Northward propagation of boreal summer intraseasonal oscillation (BSISO) over the Western North Pacific (WNP) has significant impacts on extreme events over Asia and Europe. Here we test hypotheses that northward propagation mechanisms over the WNP may differ from those over the Indian Ocean (IO) by performing numerical experiments with changing mean states through lowering the Tibetan Plateau (TP). Our results suggest that air-sea interaction plays a dominant role in the propagation over the WNP, whereas the mean vertical wind shear mechanism is the major driver over the IO. Lowering TP significantly reduces sea surface temperature (SST) anomalies to the north of BSISO center due to the enhanced surface wind and latent heat flux anomalies. This air-sea interaction reduces upward transport of heat and moisture from surface to lower troposphere, weakening the northward propagation over the WNP. This study implies changes in SST patterns under global warming may influence BSISO propagation.

AB - Northward propagation of boreal summer intraseasonal oscillation (BSISO) over the Western North Pacific (WNP) has significant impacts on extreme events over Asia and Europe. Here we test hypotheses that northward propagation mechanisms over the WNP may differ from those over the Indian Ocean (IO) by performing numerical experiments with changing mean states through lowering the Tibetan Plateau (TP). Our results suggest that air-sea interaction plays a dominant role in the propagation over the WNP, whereas the mean vertical wind shear mechanism is the major driver over the IO. Lowering TP significantly reduces sea surface temperature (SST) anomalies to the north of BSISO center due to the enhanced surface wind and latent heat flux anomalies. This air-sea interaction reduces upward transport of heat and moisture from surface to lower troposphere, weakening the northward propagation over the WNP. This study implies changes in SST patterns under global warming may influence BSISO propagation.

KW - air-sea interaction

KW - boreal summer intraseasonal oscillation

KW - northward propagation

KW - the Tibetan Plateau

KW - the Western North Pacific

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Dominant Process for Northward Propagation of Boreal Summer Intraseasonal Oscillation Over the Western North Pacific

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Keywords

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