The influence of wave trains in mid-high latitudes on persistent heavy rain during the first rainy season over South China

Miao, Rui; Wen, Min; Zhang, Renhe; Li, Lun

doi:10.1007/s00382-019-04670-y

Cited by 33 publications

(20 citation statements)

References 34 publications

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“…Miao et al . (2019) found a wave train crossing the Eurasian continent and another, along with the subtropical westerly jet, in the mid–high latitudes, to be associated with persistent heavy rain events over South China.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty of central China summer precipitation and related natural internal variability under global warming of 1 to 3°C

Chen

et al. 2021

Intl Journal of Climatology

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This study examines the response of summer precipitation over central China to global warming via the 50-member large-ensemble simulations conducted with the Canadian Earth System Model Version 2. It is found that the model ensemble mean summer precipitation stagnates under warming of 1 to 3 C, while precipitation increases rapidly over central China after 3 C of warming. This phenomenon indicates a strong nonlinear relationship between precipitation change and global warming, and the effects due to natural internal variability are more substantial than those of CO 2 forcing in the early warming stage. We further examine the factors responsible for the large uncertainty of the precipitation projection over central China under warming of 1 to 3 C. For the members producing a precipitation increase over central China, the geopotential height and sea level pressure changes show a positive North Atlantic Oscillation-like trend pattern over the North Atlantic and a southeastward propagating atmospheric teleconnection from the North Atlantic to China. The atmospheric teleconnection from the mid-high-latitude Atlantic to China provides diverging winds in the upper troposphere, causing ascending motion, and contributes to increased precipitation over central China. Besides, an El Niño-like trend pattern of sea surface temperature (SST) is apparent in the preceding winter, which could contribute to the formation a low-level anticyclone trend over the western North Pacific (WNP) in the subsequent summer via modulating the SST anomalies in the Indian and Atlantic oceans. The northward water vapour transport in the western part of the anticyclone also favours increased precipitation in central China. The above processes also apply to decreased precipitation, except with opposite signs of anomalies. This study highlights the combined contributions of mid-high-latitude teleconnection and the WNP anticyclone related to tropical Pacific SST to the uncertainty in the projection of precipitation over central China.

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Section: Introductionmentioning

confidence: 99%

Uncertainty of central China summer precipitation and related natural internal variability under global warming of 1 to 3°C

Chen

et al. 2021

Intl Journal of Climatology

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“…During May and June, the precipitation is closely associated with water vapour transport and atmospheric circulations over East Asia (Miao et al ., 2019). The spatial distributions of geopotential height and wind fields at 850 hPa and 500 hPa, and the column water vapour flux in the reanalysis data and CTL, as well as the spatial distributions of their bias, are shown in Figure 7.…”

Section: Numerical Simulation Of the Effect Of Soil Moisture On The P...mentioning

confidence: 99%

Local and non‐local atmospheric effects of abnormal soil moisture over Indochina during May and June

Dong

Chen

Zhang

et al. 2022

Quart J Royal Meteoro Soc

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Indochina is one of the key areas affecting the East Asian summer monsoon and its thermal condition can modulate the prevailing wind and water vapour transport, especially in the early stages of establishment of the summer monsoon. Previous studies emphasized the climatic effect of the seasonal‐averaged soil moisture (SM), but the subseasonal effects of land surface processes over Indochina are not clear yet. This study investigated the subseasonal effect of SM in Indochina on precipitation in southern China (SC) during May and June together with its relevant mechanism based on both statistical analysis and numerical experiments. Results show that increased SM in Indochina in May is closely associated with increased local (Indochina) precipitation and suppressed non‐local (SC) precipitation in June. The positive SM anomaly over Indochina can persist from May to June, cooling the atmosphere and increasing the specific humidity in the lower troposphere. Meanwhile, the potentially unstable lower troposphere and the ascending motion over Indochina result in strengthened upward moisture advection and condensational heating, which are conducive to forming an abnormal cyclonic circulation and increased precipitation over Indochina. To the northeast, an easterly wind anomaly appears in SC, leading to weakened moisture transport and decreased precipitation. When the SM decreases over Indochina, the opposite results are obtained. Moreover, through increasing and decreasing SM in Indochina in May, numerical experiments showed similar results to those of reanalysis data and further indicated that the moist and thermal processes of the SM anomaly over Indochina play distinct roles in affecting the atmosphere and regional precipitation. The moisture process mainly influences local precipitation, whereas the thermal process can change the precipitation non‐locally. This study highlights the significant local and non‐local impacts of SM in Indochina and could contribute to understanding the physical mechanisms of SM effects.

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“…We calculated the wave activity flux (WAF) to depict the wave activity pattern (Takaya and Nakamura, 2001;Miao et al, 2019) using the following formula:…”

Section: Wave Activity Fluxmentioning

confidence: 99%

Multiscale Causes of Persistent Heavy Rainfall in the Meiyu Period over the Middle and Lower Reaches of the Yangtze River

et al. 2021

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Based on observation data supplied by the Chinese Meteorological Administration (CMA) and reanalysis datasets provided by the ECMWF, the multiscale causes of persistent heavy rainfall events (PHREs) that occurred from 1979 to 2018 during Meiyu periods over the middle and lower reaches of the Yangtze River (MLYR) are investigated. During Meiyu periods, precipitation shows obvious interannual variabilities. In PHRE years, the contribution rate of persistent heavy rainfall to the total precipitation is approximately 57%. Precipitation also shows significant synoptic-scale (less than 10 days) characteristics. Through the quantitative diagnosis of interactions among background-scale (greater than 30 days), quasi-biweekly-scale (10–30-days), and synoptic-scale variables, the possible causes of PHREs are explored. The results reveal that the difference in precipitation intensity between PHRE years and non-PHRE years is determined by the background water vapor, background wind and synoptic-scale wind conditions. In PHRE years, the prevailing background southwesterly winds from lower latitudes provide more background water vapor, and more mean kinetic energy is converted to perturbation energy. Moreover, the active synoptic-scale oscillations from higher latitudes and the convergence of Rossby wave disturbance energy over the MLYR could also cause the occurrence and maintenance of PHREs during Meiyu periods. The multiscale causes and corresponding circulation patterns in 2020 PHREs are similar to PHREs years.

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The influence of wave trains in mid-high latitudes on persistent heavy rain during the first rainy season over South China

Cited by 33 publications

References 34 publications

Uncertainty of central China summer precipitation and related natural internal variability under global warming of 1 to 3°C

Uncertainty of central China summer precipitation and related natural internal variability under global warming of 1 to 3°C

Local and non‐local atmospheric effects of abnormal soil moisture over Indochina during May and June

Multiscale Causes of Persistent Heavy Rainfall in the Meiyu Period over the Middle and Lower Reaches of the Yangtze River

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