The Controlling Role of Boundary Layer Inertial Oscillations in Meiyu Frontal Precipitation and Its Diurnal Cycles Over China

Xue, Ming; Luo, Xia; Zhu, Kefeng; Sun, Zhengqi; Fei, Jianfang

doi:10.1029/2018jd028368

Cited by 87 publications

(144 citation statements)

References 62 publications

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“…The contour lines in the Yangtze Plain were sparse, and the mean winds were weak. (Xue et al, 2018). The 500-hPa contour lines in the study area were dense with strong winds.…”

Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 82%

“…Figure 6 shows the Himawari-8 10.4-μm brightness temperature within ±4 hr of the precipitation event. We suggest that cloud A was formed by nocturnal strong southwesterly moisture transport and then dissipated as the moisture transport getting weaker during the day (Chen, Sha, et al, 2017;Xue et al, 2018). Among them, the minimum brightness temperature of cloud A was increasing and the area of cloud was decreasing, showing that cloud A was a typical dissipating cloud.…”

Section: Morning Casementioning

confidence: 87%

“…The early morning peak was previously thought to be the only peak in the diurnal cycle of precipitation during the Meiyu period (Geng & Yamada, 2007;Xue et al, 2018). The early morning peak was previously thought to be the only peak in the diurnal cycle of precipitation during the Meiyu period (Geng & Yamada, 2007;Xue et al, 2018).…”

Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 99%

“…The location of the subtropical high was adjoined to the Yangtze Plain, indicating that the impact of subtropical high was strong. The enhanced wind diurnal amplitude during the normal Meiyu periods over the Yangtze Plain was thought to be beneficial for the morning rainfall peak (Xue et al, 2018). The pressure gradient in the Yangtze Plain during the atypical Meiyu periods was affected by the subtropical high and the northern air pressure and was therefore much smaller than that in normal periods.…”

Section: Horizontal Distribution Of Environmental Circulation and Prementioning

confidence: 99%

“…Chen, Sha, et al (2017) presented numerical simulations of a heavy rainfall event on 11-16 June 1998 and suggested that the southwesterly nocturnal low-level jet acts as a mechanism for the transport of moisture and the formation of rainfall. Using the WRF-ARW model, Xue et al (2018) performed a 6-day simulation of Meiyu precipitation over the Yangtze Plain and attributed the prominent peak in the morning rainfall to the diurnal cycle of clockwise rotation of low-level ageostrophic winds in the southwest of the Meiyu rainband. Thus, the ageostrophic wind is perpendicular to the geostrophic wind, which reduced the supply of moisture in the afternoon, whereas they are parallel and in same direction during early morning leading to the improved southwesterly moisture flux.…”

Section: Introductionmentioning

confidence: 99%

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Diurnal Variation of Meiyu Rainfall in the Yangtze Plain During Atypical Meiyu Years

et al. 2020

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The diurnal variation of precipitation reflects the influence of atmospheric heat and dynamic processes on the water cycle. Using multiple data sets, we carried out case studies and statistical analysis of the diurnal variation in Meiyu rainfall in atypical Meiyu years. Our results show that the morning precipitation was induced by strong southwesterly moisture transport and was mainly composed of stratiform pixels, whereas the precipitation occurring in the afternoon was mainly composed of convective pixels affected by updrafts. The diurnal variation in precipitation in the atypical Meiyu years appeared as a bimodal structure with peaks in early morning (06:30 LST) and afternoon (16:00 LST), which was different from the single morning peak (09:30 LST) in the normal Meiyu years and reported previously. Further research indicated that the morning peak is related to the low-level water vapor flux, whereas the afternoon peak is related to the local solar heating. In addition, the water vapor flux in the Yangtze Plain was characterized by strong morning and weak afternoon fluxes during both normal and atypical Meiyu periods. The diurnal variation in the low-level water vapor flux is thought to be influenced by the intensity of, and distance from, the subtropical high.

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“…The contour lines in the Yangtze Plain were sparse, and the mean winds were weak. (Xue et al, 2018). The 500-hPa contour lines in the study area were dense with strong winds.…”

Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 82%

Section: Morning Casementioning

confidence: 87%

Section: Journal Of Geophysical Research: Atmospheresmentioning

confidence: 99%

Section: Horizontal Distribution Of Environmental Circulation and Prementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diurnal Variation of Meiyu Rainfall in the Yangtze Plain During Atypical Meiyu Years

et al. 2020

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The flow and moisture fluxes associated with ridging South Atlantic Ocean anticyclones during the subtropical southern African summer

Ndarana

Mpati

Bopape

et al. 2020

Intl Journal of Climatology

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Using 38 years of ERA-Interim reanalyses, this study examines the flow and associated moisture fluxes induced by ridging South Atlantic Ocean anticyclones over South Africa. The flow and moisture fluxes are divided into their geostrophic and ageostrophic components. Composite analysis reveals that ridging high pressure systems are modulated by Rossby wave trains that develop upstream in the middle latitudes near South America and the South Atlantic Ocean near the Greenwich Meridian. The wave trains are similar to those that are associated with tropical temperate troughs (TTTs) and nearly all TTTs are followed by ridging, whilst 20% of the ridging events are linked to TTTs. Composite analysis also shows that ridging-induced moisture fluxes affecting South Africa originate from different areas of the surrounding oceans at different times during the evolution of ridging highs. In the early stages, moisture enters the country along the southeastern coast through ageostrophic processes from a moisture divergence region located adjacent to the coast and remains largely south of 30 S latitude line. The moisture fluxes have a northeastern orientation on land, following the geometry of the eastern coast. These ageostrophic fluxes contribute to the occurrence of rainfall during the ridging process in the region located between Lesotho and Swaziland. Ridging events are associated with about 60% of rainfall days in summer over southern Africa whilst TTTs contribute about 21% summer rainfall days. During the later stages of the evolution of ridging, geostrophic fluxes enter the southern parts of Mozambique and contribute the accumulation of moisture in that region. The associated moisture divergence region is always located ahead of its ageostrophic counterpart, with a local maximum eventually forming in the Mozambique Channel.

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Northeastward propagation of nocturnal precipitation over the Sichuan Basin

Zhao

et al. 2020

Intl Journal of Climatology

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The Sichuan Basin (SCB) is located to the east of the Tibetan Plateau (TP) and features nocturnal precipitation. This study explores spatial variation of nocturnal precipitation during the warm season over the SCB using high spatiotemporal resolution merged precipitation products from 2008 to 2017. It is found that there is a prominent northeastward timing delay of precipitation peak over the SCB, that is, the diurnal peak of precipitation occurs in the midnight over the southwestern SCB whereas in the early morning over the northeastern SCB. This time delay is partly ascribed to a northeastward propagation of precipitation over the SCB, account for about 40% and 25% of the diurnal variation of precipitation over the central and northeastern SCB, respectively. Precipitation first occurs over the southwestern edge of the SCB at about 1900-2000 LST, and then propagates northeastward steered by the large-scale midtropospheric southwesterly airflow, which is consistent with the northeastward propagation of the large moisture convergence. The precipitation reaches the northeastern SCB in the early morning. The diurnal variation of 850-hPa wind has strong easterly wind deviations in the early evening over the southwestern SCB, which favours for an initiation of precipitation by orographic lift of air. The diurnal variation of difference in equivalent potential temperature between 500 hPa and 850 hPa has a maximum negative deviation in the early evening over the southwestern SCB, which enhances the instability and therefore favours an initiation of precipitation. The Yunnan-Guizhou Plateau (YGP) may play an important role in the initiation of precipitation over the southwestern SCB in the early evening.

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The Controlling Role of Boundary Layer Inertial Oscillations in Meiyu Frontal Precipitation and Its Diurnal Cycles Over China

Cited by 87 publications

References 62 publications

Diurnal Variation of Meiyu Rainfall in the Yangtze Plain During Atypical Meiyu Years

Diurnal Variation of Meiyu Rainfall in the Yangtze Plain During Atypical Meiyu Years

The flow and moisture fluxes associated with ridging South Atlantic Ocean anticyclones during the subtropical southern African summer

Northeastward propagation of nocturnal precipitation over the Sichuan Basin

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