Diverse Interannual Variability of Asian Summer Monsoon Onset Process

Liu, Boqi; Duan, Yanan

doi:10.1029/2022gl100583

Cited by 4 publications

(1 citation statement)

References 62 publications

(84 reference statements)

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“…The RM exists narrowly in the western North America from north to south, which is different from the orientation of the TP. The TP is mainly oriented broadly from west to east, and the upwelling prevails over the high terrain during the monsoon season (Liu & Duan, 2022; Piao et al., 2023; Yao et al., 2023). In contrast, the strong upwelling is not evident over the narrow RM, and the strong divergence of the ozone over the central North American continent is also weaker than over Asia (shown later).…”

Section: Comparison Of Ozone Distribution Over Tibetan Plateau and Ro...mentioning

confidence: 99%

Comparison of the Climatic Characteristics of Ozone Valley Over the Tibetan Plateau and the Rocky Mountains

Shen,

Rao,

Guo

et al. 2024

Earth and Space Science

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This study compares the ozone valleys over the Tibetan Plateau (TP) and the Rocky Mountains (RM) using the ERA5 reanalysis data set. The dynamical transport of the ozone over these two regions is analyzed using the Lorenz circulation decomposition method. The ozone content valley over TP is observed around 200–50 hPa (upper troposphere and lower stratosphere, or UTLS), and that over RM is around 300–100 hPa. It is shown that the TP ozone content is smaller than that over RM. By analyzing the spatiotemporal distribution of the ozone content and the general circulation, the anticyclone over Southern Asian (SAH) plays a significant role in existence of the TP ozone valley, and the ozone content flux reaches its maximum in July. Large‐scale terrain and related general circulation determine the ozone valley appearance. Further analysis suggests that stationary transport has a larger impact on the ozone valley formation than the transient transport. The transport by the zonal circulation nearly cancels out most of that by the meridional circulation, due to the fact that the zonal transport magnitude is nearly equal to the meridional transport. The transport center over the RM is much weaker than that over the TP. Furthermore, the contrasts between transient and stationary transports are less evident over RM than over TP. The eddy‐driven stationary ozone transport flux significantly impacts the development of the two low ozone centers across these large terrains.

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Section: Comparison Of Ozone Distribution Over Tibetan Plateau and Ro...mentioning

confidence: 99%

Comparison of the Climatic Characteristics of Ozone Valley Over the Tibetan Plateau and the Rocky Mountains

Shen,

Rao,

Guo

et al. 2024

Earth and Space Science

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Interdecadal delay of the South China Sea summer monsoon onset after 2010

Wu,

2024

Clim Dyn

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The onset of the South China Sea summer monsoon (SCSSM) implies the transition of East Asian monsoon circulation from winter to summer, which affects not only the local weather and climate near the South China Sea (SCS) but also other regions through remote teleconnection. In this paper, the interdecadal variability characteristics of the SCSSM onset is analyzed by using various datasets as well as its possible causes. The results show that there is a signi cant interdecadal change in the onset date of the SCSSM around 2010. The onset is early around May 12 during 1994-2009, conversely, the onset is signi cantly late during 1980-1993 and 2010-2020 with an average of May 29. Besides, the SCS May climate also took signi cantly decadal shift around 2010 and manifested itself in atmospheric forcing on the ocean, thus the SCSSM onset is mainly in uenced remotely by tropical Paci c SST anomaly. However, the close relationship between the SCS precipitation and tropical eastern Paci c SST drops dramatically after 1998, while its correlation with the tropical central Paci c SST rises up to -0.8 after 2010, playing a leading role. The related anomalous anticyclone over the SCS not only prevents the western Paci c subtropical high withdrawing eastward, but also weakens the activity of low-frequency oscillation and, both unfavorable for the convection formation and SCSSM onset. Therefore, besides the tropical eastern Paci c SST, more and special attentions should be paid on the tropical central Paci c SST condition, it will help us to monitor and predict the SCSSM onset effectively and improve the seasonal prediction of East Asia summer monsoon greatly.

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Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau

Hu,

Duan,

Tang

et al. 2023

Environ. Res. Lett.

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Most global circulation models (GCMs) from the Coupled Model Intercomparison Project Phase 6 (CMIP6) simulate a delayed onset of the tropical Asian summer monsoon of 3–6 pentads when compared with the observations. However, a clear explanation of this model bias has yet to be developed. This study indicates that 23 of the 31 of CMIP6 models generate both the Tibetan Plateau (TP) cold bias and the delayed monsoon onset across tropical Asia. The aloft TP cold air temperature associated with these models tends to reduce the land–sea thermal contrast and monsoon circulation, and hence it generates a delayed onset for the tropical summer monsoon. Two sensitivity experiments based on a coupled ocean–atmosphere–land GCM, together with additional data analysis, further confirm the underlying connection between monsoon onset and temperature anomaly over the TP. Therefore, it is of great importance that we attempt to reduce the model bias associated with the simulation of monsoon onset by improving the physical process parameterization scheme related to the TP temperatures.

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Diverse Interannual Variability of Asian Summer Monsoon Onset Process

Cited by 4 publications

References 62 publications

Comparison of the Climatic Characteristics of Ozone Valley Over the Tibetan Plateau and the Rocky Mountains

Comparison of the Climatic Characteristics of Ozone Valley Over the Tibetan Plateau and the Rocky Mountains

Interdecadal delay of the South China Sea summer monsoon onset after 2010

Delayed onset of the tropical Asian summer monsoon in CMIP6 can be linked to the cold bias over the Tibetan Plateau

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