2019
DOI: 10.1002/joc.6160
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Dynamic effect of the South Asian high on the interannual zonal extension of the western North Pacific subtropical high

Abstract: The South Asian high (SAH) and the North Pacific subtropical high (NPSH) are two crucial systems affecting the summer rainfall over East Asia. Features of the relative vorticity of the SAH and its dynamic effect on zonal extension of the western NPSH (WNPSH) are investigated on interannual timescales using data diagnosis and numerical model experiments. Results show that two climatological centres of negative relative vorticity are observed along the northern flank of the SAH over the Tibetan Plateau and north… Show more

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Cited by 30 publications
(14 citation statements)
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“…Wei et al (2014) revealed the influence of the eastward extension of the Tibetan High (the South Asian High) on the EASM rainfall. Furthermore, the eastward shift of the Tibetan High can lead to a westward extension of the WNPSH (Wei et al, 2019). Therefore, the zonal shifts of these two highpressure systems are not independent but related to each other.…”
Section: Large-scale Environmentsmentioning
confidence: 99%
“…Wei et al (2014) revealed the influence of the eastward extension of the Tibetan High (the South Asian High) on the EASM rainfall. Furthermore, the eastward shift of the Tibetan High can lead to a westward extension of the WNPSH (Wei et al, 2019). Therefore, the zonal shifts of these two highpressure systems are not independent but related to each other.…”
Section: Large-scale Environmentsmentioning
confidence: 99%
“…The vital region of SAH and WNPSH synergy is in the domain 158-358N, 1208-1358E, and there exists a negative vorticity anomaly. Wei et al (2019) suggested that when the SAH shifts southwestward, an anomalous anticyclone occurs over eastern China at 200 hPa. There is downward advection of vorticity by anomalous sinking motions.…”
Section: B the Relationship Between The Synergy Index And Long-lived Hwsmentioning
confidence: 99%
“…The main physical process is that when the SAH intensifies, an anomalous anticyclone occurs at the 200 hPa level over the YRB, and a downward advection of vorticity by anomalous sinking motions exists. Consequently, the negative vorticity anomaly is formed at 500 hPa, which can lead to a strong westward extension of the WPSH and the occurrence of long-lived HWEs [49]. However, under the SSP585 scenario, the SAH will increase more obviously, which will result in a wider and stronger influence of the WPSH, and both short-lived HWEs and long-lived HWEs will be affected.…”
Section: Projection Of Hwesmentioning
confidence: 99%