Decadal change of the connection between summer western North Pacific Subtropical High and tropical <scp>SST</scp> in the early 1990s

He, Chao; Zhou, Tianjun

doi:10.1002/asl2.550

Cited by 32 publications

(18 citation statements)

References 33 publications

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“…For example, with respect to PC2, before 1995 there is large spreads among the four PCs while after 1995 the PCs are well consistent with each other. He and Zhou () have investigated the decadal modulation of the connection between WPSH and tropical SST in the early 1990s and stated that after this decadal change, the interannual variability of the WPSH is more strongly regulated by the SST anomaly over the equatorial central Pacific and the maritime continent. Whether this decadal modulation contributed to the decadal change in the relationship of the WPSH PCs deserves future study.…”

Section: Resultsmentioning

confidence: 99%

Comparison of the two modes of the Western Pacific subtropical high between early and late summer

Dong

Lin

Fan

2017

Atmospheric Science Letters

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Section: Resultsmentioning

confidence: 99%

Comparison of the two modes of the Western Pacific subtropical high between early and late summer

Dong

Lin

Fan

2017

Atmospheric Science Letters

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“…Its multi-scale variability, ranging from sub-seasonal to inter-decadal time scales, impacts society through natural disasters and changes in water resources (e.g. Chang et al 2000, Lau and Kim 2012, He and Zhou 2015, Joseph et al 2015, Cho et al 2015. Recent advances in climate simulation have improved the fidelity of the ASM, but large biases remain.…”

Section: Introductionmentioning

confidence: 99%

The resolution sensitivity of the Asian summer monsoon and its inter-model comparison between MRI-AGCM and MetUM

et al. 2017

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In this study, we compare the resolution sensitivity of the Asian Summer Monsoon (ASM) in two Atmospheric General Circulation Models (AGCMs): the MRI-AGCM and the MetUM. We analyze the MetUM at three different resolutions, N96 (approximately 200-km mesh on the equator), N216 (90-km mesh) and N512 (40-km mesh), and the MRI-AGCM at TL95 (approximately 180-km mesh on the equator), TL319 (60-km mesh), and TL959 (20-km mesh). The MRI-AGCM and the MetUM both show decreasing precipitation over the western Pacific with increasing resolution, but their precipitation responses differ over the Indian Ocean. In MRI-AGCM, a large precipitation increase appears off the equator (5-20 N). In MetUM, this off-equatorial precipitation increase is less significant and precipitation decreases over the equator. Moisture budget analysis demonstrates that a changing in moisture flux convergence at higher resolution is related to the precipitation response. Orographic effects, intra-seasonal variability and the representation of the meridional thermal gradient are explored as possible causes of the resolution sensitivity. Both high-resolution AGCMs (TL959 and N512) can represent steep topography, which anchors the rainfall pattern over south Asia and the Maritime Continent. In MRI-AGCM, representation of low pressure systems in TL959 also contributes to the rainfall pattern. Furthermore, the seasonal evolution of the meridional thermal gradient appears to be more accurate at higher resolution, particularly in the MRI-AGCM. These findings emphasize that the impact of resolution is only robust across the two AGCMs for some features of the ASM, and highlights the importance of multi-model studies of GCM 3 resolution sensitivity.

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“…A western boundary index (WBI), defined as the longitude of the westernmost position of the 500 hPa GH of 5,865 gpm in the range of 90°E–180°E, is used to represent the zonal variability of the WPSH (Li et al, 2019). There are many indices for the spatiotemporal variation of the WPSH in the literature (e.g., Huang & Li, 2015; He & Zhou, 2015; Yang et al, 2017). Here we used the WBI because it can well represent the western boundary movement of the WPSH in summer, following Li et al (2019).…”

Section: Resultsmentioning

confidence: 99%

The Impact of SST on the Zonal Variability of the Western Pacific Subtropical High in Boreal Summer

Wang

2020

JGR Atmospheres

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Summertime western Pacific subtropical high (WPSH) is closely related to remote sea surface temperature anomalies (SSTA) in the tropical oceans (TO) and local SSTA in the western North Pacific (WNP). Based on atmospheric reanalysis and multimodel ensemble products, the warming (cooling) of the tropical Indian, tropical central‐eastern Pacific, and tropical Atlantic (tropical western Pacific and WNP) can lead to westward extension of the WPSH, and vice versa. A series of numerical experiments are conducted to quantify the relative importance of remote and local SSTA, including the separate impact of different TO basins. In response to warming (cooling) of the tropical Indian, tropical central‐eastern (western) Pacific, and tropical Atlantic, ascending (descending) motions develop locally and subsequently excite remote baroclinic and barotropic responses. The baroclinic anticyclone west of 140°E contributes to the westward extension of the WPSH. The barotropic anticyclone and descending motion over the WNP can further increase the sea level pressure and strengthen the WPSH. Based on the quasi‐geostrophic omega equation, we find that the anomalous vorticity advection (thermal advection) primarily accounts for the anomalous descending motion in response to remote (local) SSTA. Compared to local SSTA, the remote SSTA can induce larger perturbations, subsequently making the zonal variability of the WPSH more significant. Furthermore, it is found that the westward extension of the WPSH is primarily induced by atmospheric baroclinic (barotropic) response to the SSTA in tropical Indian and tropical Atlantic (tropical Pacific). Overall, the tropical Indian plays the most important role on the zonal movement of the WPSH.

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Decadal change of the connection between summer western North Pacific Subtropical High and tropical SST in the early 1990s

Cited by 32 publications

References 33 publications

Comparison of the two modes of the Western Pacific subtropical high between early and late summer

Comparison of the two modes of the Western Pacific subtropical high between early and late summer

The resolution sensitivity of the Asian summer monsoon and its inter-model comparison between MRI-AGCM and MetUM

The Impact of SST on the Zonal Variability of the Western Pacific Subtropical High in Boreal Summer

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