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

Xia, Yicong; Huang, Qian; Yao, Shuntian; Sun, Tianle

doi:10.3389/feart.2021.700878

Cited by 4 publications

(4 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, Meiyu in 2016 also has typical quasibiweekly oscillation (QBWO) characteristics (Huang et al, 2020). In addition to the aforementioned typical events, the results of the climate statistics also confirm that China's precipitation has significant ISO characteristics, including QBWOs and 30-to 60-day oscillations (Mao et al, 2010;Yang et al, 2010;Yin et al, 2011;Liu et al, 2018;Xia et al, 2021;Zhou et al, 2021).…”

Section: Introductionmentioning

confidence: 72%

The Quasi-Biweekly Oscillation of Summer Rainfall in Southern China and Its Relationship With the Geopotential Height Anomaly Over the North Atlantic Ocean

2021

Self Cite

View full text Add to dashboard Cite

Summer precipitation in East Asia has significant quasi-biweekly (10–30-day) oscillation characteristics. By using gauge-based precipitation and ERA-Interim reanalysis data, the basic mode of the quasi-biweekly oscillation of summer precipitation in East Asia and the related circulation from 1979 to 2012 were analyzed. It was found that the middle and lower reaches of the Yangtze River and its south in China were among the key areas for the 10- to 30-day oscillation of summer precipitation. After selecting typical summer precipitation events with 10- to 30-day oscillation characteristics in key areas and conducting composite analysis, it is found that in the dry (wet) phase of quasi-biweekly precipitation in southern China, it is controlled by quasi-biweekly anticyclone (cyclone) at 500 hPa above the key area. During the evolution of quasi-biweekly precipitation, the ridge of the Northwest Pacific Subtropical High is located between 20 and 22°N latitude, and there is no significant variability in the large-scale background circulation. Furthermore, composite analysis of the precursory signal at 500 hPa during quasi-biweekly precipitation in southern China found that there was an obvious quasi-biweekly geopotential height anomaly over the North Atlantic Ocean almost 30 days before the peak day of quasi-biweekly precipitation. While the quasi-biweekly geopotential height anomaly at 500 hPa in the North Atlantic propagates eastward, it also leads the cold air to transport southward. Cold air from high latitudes and warm air from low latitudes converge in southern China, which affects the quasi-biweekly oscillation of precipitation. Hysteresis synthesis of precipitation based on 500 hPa geopotential height’s quasi-biweekly oscillation events over the North Atlantic Ocean comes to almost the same conclusion. Therefore, the 500 hPa geopotential height quasi-biweekly anomaly in the North Atlantic may have important prediction significance for an extended-range forecast of summer rainfall in China.

show abstract

Section: Introductionmentioning

confidence: 72%

The Quasi-Biweekly Oscillation of Summer Rainfall in Southern China and Its Relationship With the Geopotential Height Anomaly Over the North Atlantic Ocean

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The MJO, eastward propagating along the equatorial region, in spite of having a weaker variability during boreal summers as compared to that in the boreal winter (Madden and Julian, 1994; Wheeler and Hendon, 2004; Zhang, 2005), has a considerable influence on the variability of the monsoon at intraseasonal timescales (Pai et al ., 2011; Bhatla et al ., 2017; Li et al ., 2019). However, BSISO (Wang and Xie, 1997; Lee et al ., 2013a; Chen and Wang, 2021), which has a prominent northward propagation and extends further northward from the equator, is the prevalent ISO mode responsible for the short‐term climate variability of the monsoon (Yasunari, 1979; Murakami, 1983; Wang et al ., 2005; Yun et al ., 2008; Kulkarni et al ., 2011; Li et al ., 2015; Xia et al ., 2021). While the MJO has a periodicity of 30–60 days, the BSISO exhibits two different periodicities: BSISO1 with a periodic cycle of 30–60 days and BSISO2 recurring every 10–20 days.…”

Section: Resultsmentioning

confidence: 99%

Interconnection between the Indian and the East Asian summer monsoon: Spatial synchronization patterns of extreme rainfall events

Gupta

Boers

et al. 2022

Intl Journal of Climatology

View full text Add to dashboard Cite

A deeper understanding of the intricate relationship between the two components of the Asian summer monsoon (ASM)-the Indian summer monsoon (ISM) and the East Asian summer monsoon (EASM)-is crucial to improve the subseasonal forecasting of extreme precipitation events. Using an innovative complex network-based approach, we identify two dominant synchronization pathways between ISM and EASM-a southern mode between the Arabian Sea and southeastern China occurring in June, and a northern mode between the core ISM zone and northern China which peaks in July-and their associated large-scale atmospheric circulation patterns. Furthermore, we discover that certain phases of the Madden-Julian oscillation and the lower frequency mode of the boreal summer intraseasonal oscillation (BSISO) seem to favour the overall synchronization of extreme rainfall events between ISM and EASM while the higher-frequency mode of the BSISO is likely to support the shifting between the modes of ISM-EASM connection.

show abstract

“…There is always a persistent precipitation stage of Meiyu from June to July every year, which is called Meiyu period for the middle and lower reaches of the Yangtze River. During the Meiyu periods, precipitation shows obvious interannual variabilities (Xia et al, 2021).…”

Section: Meiyu In 2016mentioning

confidence: 99%

“…With the rapid development of the regional economy, a large amount of energy consumption and the continuous growth of motor vehicle ownership, the air quality of Wuxi presents complex air pollution dominated by PM 2.5 , PM 10 , O 3, and NO 2 (Guo et al, 2013). Meiyu in Jianghuai Region is an important weather phenomenon in eastern China, and the meiyu rainy season precipitation is a product of interactions between the East Asian summer monsoon system and the Eurasian mid-high-latitude circulation (Xia et al, 2021). Due to the prevailing wind direction and precipitation in the monsoon climate, the air quality in Wuxi is relatively clean in summer compared with winter.…”

Section: Introductionmentioning

confidence: 99%

Size Distributions of Water-Soluble Inorganic Ions in Atmospheric Aerosols During the Meiyu Period in the Yangtze River Delta, China

Liu

Zhao

et al. 2021

Front. Environ. Sci.

View full text Add to dashboard Cite

In order to investigate the chemical composition distributions and pollution characteristics of Total water-soluble inorganic ions (TWSII) in the rain period (Meiyu) in the East Asian summer monsoon season, including the impact of Meiyu on air pollution in the Yangtze River Delta, East China, the gaseous pollutant concentrations, the 9 sizes segregated particles, and water-soluble inorganic ions of aerosols were measured on the north shore of Taihu Lake from June 4 to July 5, 2016. Results show that the mass concentrations of atmospheric particulate matters (PM2.5 and PM10) and main gaseous pollutants (SO2, NO2, CO, and O3) decrease during the Meiyu period, with the largest decline in PM10 and the smallest in CO. TWSII in atmospheric particles are mainly concentrated in fine particles during the Meiyu period. The values of ρ (TWSII) for PM1.1, PM1.1–2.1, and PM2.1–10 before the Meiyu onset are generally greater than those during the Meiyu period. During the first pollution process, the ρ(TWSII) for PM1.1 and PM1.1–2.1 first increase to the peak values, and then decrease during the moderate rainfall period, when the ρ(TWSII) in PM2.1–10 increase to its maximum before the Meiyu onset. The mass concentrations for anions, cations, and total ions at different particle-size sections all exhibit bimodal distributions before and after the Meiyu onset. The mass concentration peaks at a particle size of 1.1–2.1 μm for fine particles, while at 5.8–9.0 μm (before the Meiyu onset) and 9.0–10.0 μm (during the Meiyu period) for coarse particles, respectively. The peak particle size for mass concentration of coarse particles moves toward larger sizes during the Meiyu period. The mass concentrations of SO42− at different particle-size sections show a bimodal distribution before the Meiyu onset and a multi-modal distribution during the Meiyu period. The mass concentrations of NO3− at different particle-size sections show a bimodal distribution before the Meiyu onset and a unimodal distribution during the Meiyu period. The mass concentrations of NH4+ at different particle-size sections present a bimodal distribution before and after the Meiyu onset, with the particle-size for peak concentrations distributing in 1.1–2.1 and 5.8–9.0 μm before the Meiyu onset, and 9.0–10.0 μm during the Meiyu period. The mean value of nitrogen oxidation ratio (NOR) is higher before the Meiyu onset than after, indicating that the secondary conversion of NO2 before the Meiyu onset is enhanced. The sulfur oxidation ratio (SOR) values are greater than NOR values, but the concentrations of NO2 in the same period during the Meiyu period are higher than those of SO2, which indicates that the secondary conversion of SO2 during the Meiyu period on the north bank of Taihu Lake is stronger than that of NO2. During the whole observation, the contribution of stationary sources mainly contributed to the atmospheric particulate matters during the Meiyu period. The contributions of vehicle exhaust and coal combustion to fine particles are more obviously affected by the changes in meteorological conditions during the Meiyu period, and the vehicle emissions contribute more to PM1.1–2.1 than to PM1.1.

show abstract

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

Cited by 4 publications

References 52 publications

The Quasi-Biweekly Oscillation of Summer Rainfall in Southern China and Its Relationship With the Geopotential Height Anomaly Over the North Atlantic Ocean

The Quasi-Biweekly Oscillation of Summer Rainfall in Southern China and Its Relationship With the Geopotential Height Anomaly Over the North Atlantic Ocean

Interconnection between the Indian and the East Asian summer monsoon: Spatial synchronization patterns of extreme rainfall events

Size Distributions of Water-Soluble Inorganic Ions in Atmospheric Aerosols During the Meiyu Period in the Yangtze River Delta, China

Contact Info

Product

Resources

About