Intraseasonal variability and predictability of the subtropical Asian summer rain band

Wang, Zunya; Lu, Mengmeng; Zhou, Botao; Yang, Song; Jiang, Xingwen; Ke, Zongjian

doi:10.1002/joc.5033

Cited by 6 publications

(6 citation statements)

References 49 publications

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“…3b is thought to be due to the delayed northward movement of EASM front over the Korean peninsula. According to Wang and LinHo (2002) and Wang et al (2017), the EASM Fig. 1 a Spatial distribution of ASOS 56 stations in South Korea.…”

Section: Resultsmentioning

confidence: 99%

Possible Mechanisms of Long-Term Trend of June Rainfall over the Korean Peninsula

Song

Sohn

2020

Asia-Pacific J Atmos Sci

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The June rainfall over the Korean peninsula has exhibited a significant decrease in particular after late 1990s. From the Empirical Orthogonal Function (EOF) analyses on the surface temperature, this study found two modes to be closely related to the decrease of rainfall over the peninsula. The first (second) EOF mode is associated with the enhanced surface temperature and anticyclonic circulation over the eastern Lake Baikal to northeastern China (the far East of Russia). The second mode also appears to be related to the cyclonic circulation over the East China Sea and south of Japan islands. These circulation patterns induce southeastward or eastward water vapor transports, and then contribute to the decreased moisture flux convergence and rainfall over Korea. In conclusion, the recent decrease of June rainfall over the Korean peninsula is thought to be, in part, associated with changes in the East Asian Summer Monsoon circulation possibly caused by the local warming trends over the eastern Lake Baikal to Mongolia and far East of Russia. Keywords Korea. June. Rainfall. Drought. East Asia. Monsoon The original version of this article was revised due to a retrospective Open Access order.

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Section: Resultsmentioning

confidence: 99%

Possible Mechanisms of Long-Term Trend of June Rainfall over the Korean Peninsula

Song

Sohn

2020

Asia-Pacific J Atmos Sci

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“…With the above agreement, it is not surprising that the charging gradient would control the meridional velocity of the ITCC (Figures 10a and 10b). It is worth mentioning that an enhanced eastward charging gradient was observed during the eastward propagation of the MJO (Wang & Li, 2020; Wang et al., 2017). This demonstrates the potential of the MSE budget analysis in exploring the propagation mechanism of large‐scale tropical convective organizations.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…However, this simple classical model does not suffice to explain the intraseasonal variability and the rapidity of real‐world monsoon onsets (Gadgil, 2018; Schneider & Bordoni, 2008; Wang, 2017; Wang & Xu, 1997; Webster, 1987b). Recent studies began to realize that the observed monsoon complexity could link to the seasonal migration of the Intertropical Convergence Zone (ITCZ) (Gadgil, 2018; Geen et al., 2019; Lau & Yang, 1997; Schneider & Bordoni, 2008), juxtaposed with the impacts from Climatological Intraseasonal Oscillation (CISO) (Kang et al., 1999; Wang et al., 2017; Wang & Xu, 1997). The ITCZ framework was useful when examining zonally averaged overturning circulations or convection in the oceanic trade‐wind region.…”

Section: Introductionmentioning

confidence: 99%

A Fresh View of the Asian‐Australian Monsoon Complexity: The Intertropical Convective Cell (ITCC) Framework

Cheng,

Lu,

Wang

et al. 2024

JGR Atmospheres

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The monsoon holds great significance in Asian‐Australian civilization. Recent studies realized the link between the monsoon onset and the seasonal migration of the Intertropical Convergence Zone (ITCZ). However, no clear ITCZ band is observed in the Asian‐Australian sector due to the strong influence of topography. Instead, there exists a large‐scale (∼1,500 km) tropical convective cell––a perennial system that we hereafter coin as the “intertropical convective cell (ITCC).” Using ERA5 reanalysis and satellite‐based outgoing longwave radiation products, here we show by objective detection and tracking that the ITCC exhibits eight phases during its seasonal migration along the Asian‐Maritime land bridge. Particularly, its sudden northward jump in boreal spring coincides well with the earliest (abrupt) onset of the Asian rainy season, while its equatorward retreat heralds the overall (gradual) monsoon withdrawal. These findings demonstrate the close link of the ITCC behavior to the spring‐fall asymmetry of the monsoon. Dynamically, the off‐equatorial ITCC features a monsoon regime with a cross‐equatorial overturning circulation, differing markedly from its equatorial regime with two weak overturning cells on each side. Further budget analyses prove our hypothesis that the north‐south charging gradient of the moist static energy determines the ITCC's spring‐fall asymmetric propagation, illuminating the physical origin of the spring‐fall asymmetry in the monsoon. Our results demonstrate the usefulness of the ITCC framework in understanding the Asian‐Australian monsoon complexity in a fresh and holistic manner. The framework will facilitate monsoon diagnosis, modeling and subseasonal‐to‐seasonal forecasting in the Asian‐Australian sector.

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“…Wang et al . (2017) proposed the CISO of the EASM rain belt and ascribed the northward migration of the rain belt to an eastward‐propagating wave train over the Eurasian continent induced by the intraseasonal North Pacific oscillation. Song et al .…”

Section: Introductionmentioning

confidence: 99%

Climatological intraseasonal oscillation in the middle–upper troposphere and its effect on the northward migration of the East Asian westerly jet and rain belt over eastern China

Liu

Mao

2021

Intl Journal of Climatology

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Using daily atmospheric circulation data for 1981–2010, we identify the climatological intraseasonal oscillation (CISO) in the mid–upper troposphere and reveal its critical role in anchoring the Meiyu season to the period from mid‐June to mid‐July and the rainfall episode of northeastern China to begin in late July. Wavelet analysis shows a significant 20–90‐day period in the climatological 200‐ and 500‐hPa zonal winds during boreal summer, indicating the existence of the zonal wind CISO in the mid–upper troposphere. The leading mode of zonal wind CISO features a dipole pattern along the coast of East Asia controlled by convection over the southeastern China–western North Pacific (SC–WNP). In mid‐June, suppressed convection over the SC–WNP induces the negative phase of intraseasonal Pacific–Japan pattern, leading to the strong anticyclone with a poleward tilt with height to dominate over the WNP. Consequently, more moisture are transported to the middle and lower reaches of the Yangtze River Valley (YRV), and the mid‐tropospheric (upper‐tropospheric) East Asian westerly jet (EAWJ) is shifted north of 32°N (36°N), which further increases the YRV rainfall through enhancing warm advection and upper‐tropospheric divergence, thus facilitating the initiation of Meiyu season. In mid‐July, active convection occupies the SC–WNP instead, with the reversed circulation pattern terminating the Meiyu season. In late July, active convection shifts from the equator to the tropical western Pacific, leading to the second mode of zonal wind CISO, which is characterized by a quasi‐barotropic Mongolian anticyclone in the mid–upper troposphere. The upper‐tropospheric EAWJ is further shifted to 45°N, displacing the induced upper‐tropospheric divergence northward, thus initiating the rainfall episode of northeastern China.

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Intraseasonal variability and predictability of the subtropical Asian summer rain band

Cited by 6 publications

References 49 publications

Possible Mechanisms of Long-Term Trend of June Rainfall over the Korean Peninsula

Possible Mechanisms of Long-Term Trend of June Rainfall over the Korean Peninsula

A Fresh View of the Asian‐Australian Monsoon Complexity: The Intertropical Convective Cell (ITCC) Framework

Climatological intraseasonal oscillation in the middle–upper troposphere and its effect on the northward migration of the East Asian westerly jet and rain belt over eastern China

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