Cloud vertical structures associated with northward advance of the East Asian summer monsoon

Sun, Guorong; Li, Yunying; Lu, Jing

doi:10.1016/j.atmosres.2018.09.013

Cited by 8 publications

(9 citation statements)

References 39 publications

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“…On the northern side of the convective center, the positive anomaly values of Q 1 are similar to those of Q 2 , indicating that the atmosphere is warmed, and heat mainly originates from the condensation process. The maximum value of Q 2 is located in the lower troposphere, leading the convective center by nearly 3 degrees of latitude (Figure b), which is consistent with the location of maximum Cu and Ac clouds (Sun et al , ). The large value area of Q 2 is also consistent with those of Cu and Ac clouds, indicating that abundant water vapor condenses into Cu and Ac clouds and warms the lower atmosphere on the northern side of the convective center.…”

Section: Thermodynamic Explanationsupporting

confidence: 84%

“…Each northward‐advancing EASM is called a northward‐advancing EASM event, which lasts approximately 5 days. Sun et al () characterized the EASM by precipitation and identified 22 northward‐advancing EASM events using the extended empirical orthogonal function method. Then, these 22 events were composited into one event in time.…”

Section: Methodsmentioning

confidence: 99%

“…Each variable (e.g., div and Q 1 ) in every three‐dimensional grid is calculated using daily ERA‐Interim data first, and the daily anomaly in every grid is obtained by subtracting the climatic average from the original value. Next, the daily composite anomaly in every grid is composited in time based on the 22 northward‐advancing EASM events identified by Sun et al (), and the daily composite anomaly in each grid during strong periods of the northward advance of the EASM (i.e., from the northward‐advancing day to the third day after the advance) is composited again in space based on the location of the daily convective center. Finally, the anomaly relative to the convective center is obtained by averaging the composited anomalies along the zonal direction between 110°E and 120°E.…”

Section: Methodsmentioning

confidence: 99%

“…The tilted CVS is composed of different spatial positions of various cloud types (Sun et al , ). Different cloud types are produced under different dynamic and thermodynamic conditions.…”

Section: Thermodynamic Explanationmentioning

confidence: 99%

“…The East Asian summer monsoon (EASM) usually advances stepwise from south to north (Ding and Chan, ). During the northward advance of the EASM, Sun et al () found that high clouds (HCs) occur in the upper troposphere and are located behind the convective center by approximately four degrees of latitude based on the CloudSat 2B‐CLDCLASS‐LIDAR product. Deep convective (DC) clouds are located near the convective center and can be considered as a reference for the precipitation center.…”

Section: Introductionmentioning

confidence: 99%

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Why is there a tilted cloud vertical structure associated with the northward advance of the East Asian summer monsoon

Sun

Liu

2019

Atmospheric Science Letters

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The cloud fraction demonstrates an obvious northward-tilting structure associated with the northward advance of the East Asian summer monsoon. As a follow-up study, this study explores the physical explanation of the tilted structure based on ERA-Interim data. The lower convergence center is located on the northern side of the convective center, and the upper divergence center is located on the southern side of the convective center. This specific atmospheric circulation promotes the formation of the tilted cloud vertical structure. Further study shows that the convective instability layer is thinner, and the convective available potential energy is smaller on the northern side of the convective center, favoring the formation of cumulus and altocumulus clouds in the lower troposphere. Condensation from cumulus convection releases latent heat, enhancing convective activity and generating an abundance of deep convective clouds. As the cloud anvils after deep convective clouds collapse, high clouds accumulate in the upper troposphere and are transported to the southern side of the convective center. Therefore, the observed clouds demonstrate a tilted structure. This study can be used to validate cloud vertical structure simulated by climate and weather models. K E Y W O R D SEast Asian summer monsoon, northward advance, tilted cloud vertical structure *Yunying Li should be regarded as co-first authors.

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Section: Thermodynamic Explanationsupporting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The tilted CVS is composed of different spatial positions of various cloud types (Sun et al , ). Different cloud types are produced under different dynamic and thermodynamic conditions.…”

Section: Thermodynamic Explanationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Why is there a tilted cloud vertical structure associated with the northward advance of the East Asian summer monsoon

Sun

Liu

2019

Atmospheric Science Letters

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Impact of the tilted cloud vertical structure on a northward-progress episode of the East Asian summer monsoonal precipitation belt

Li,

Sun,

Zhang

et al. 2024

Theor Appl Climatol

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Impact of cloud vertical structure (CVS) on a northward-progressing rainfall episode of the East Asian summer monsoon (EASM) is explored using the Weather Research and Forecasting model, in which CloudSat observation-based vertical structure of cloud liquid water content (LWC) can be imposed. Composite LWC anomaly from CloudSat data shows a northward tilted structure from the upper to the lower troposphere. Compared to the control simulation (without modification of LWC), the one with LWC imposed, but without tilted structure, doesn’t show significant changes. When LWC is introduced and northward tilted, the geopotential height (HGT) decreases in the north of the convective center, which increases the meridional wind and provides favorable conditions for the northward shift of the precipitation belt. When LWC is southward tilted, HGT decreases in the middle and lower troposphere in the south of the convective center and increases in the north, which slows down the northward shift of the precipitation belt. Adding cloud water leads to increase in humidity and decrease in temperature, causing significant increase in stratiform clouds and related precipitation. In the configuration of northward tilted LWC, low-temperature and high-humidity area is located on the north side of the convective center, favorable for the occurrence and northward shift of the precipitation belt. Deep convection is weakened with convective precipitation reduced, while shallow convection enhances the latent heat release in the lower troposphere. Therefore, more water vapor and energy are transported from boundary layer to free atmosphere, promoting the northward shift of the precipitation belt.

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Review of Chinese atmospheric science research over the past 70 years: Atmospheric physics and atmospheric environment

Wang

Gao

Zhang

et al. 2019

Sci. China Earth Sci.

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Cloud vertical structures associated with northward advance of the East Asian summer monsoon

Cited by 8 publications

References 39 publications

Why is there a tilted cloud vertical structure associated with the northward advance of the East Asian summer monsoon

Why is there a tilted cloud vertical structure associated with the northward advance of the East Asian summer monsoon

Impact of the tilted cloud vertical structure on a northward-progress episode of the East Asian summer monsoonal precipitation belt

Review of Chinese atmospheric science research over the past 70 years: Atmospheric physics and atmospheric environment

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