Strengthened influence of the East Asian trough on spring extreme precipitation variability over eastern Southwest China after the late 1980s

Nan, Yating; Sun, Jianqi; Zhang, Mengqi; Hong, Hyungki; Yuan, Junpeng

doi:10.1016/j.aosl.2022.100191

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The local factors that facilitated the anomalous meteorological conditions associated with flash droughts during the two periods are strengthened subsidence and water vapor divergence over the SYR 1–2 pentads before the onset of flash droughts. The results are consistent with previous studies that have stated that anomalous subsidence and water vapor divergence are responsible for high temperature and precipitation deficits (Ma et al., 2022; Nan et al., 2022; Wang & Yuan, 2018). However, whether the related large‐scale circulation anomalies during the two periods are resembling remains unknown.…”

Section: Resultssupporting

confidence: 93%

“…Associated with this wave train, three positive geopotential height anomalies centers are located at mid‐latitude North Atlantic, Ural Mountains and East Asia, and three negative geopotential height anomalies centers are located at western North Atlantic, western Europe, and Lake Baikal, respectively (Figures 8c, 8d and 8g, 8h). Accordingly, the EAT weakens, which prohibits the southward invasion of the cold and dry air (Lu et al., 2014; Nan et al., 2022) and facilitates the warm and moist air transported to North China along the western edge of western North Pacific subtropical high (WPSH) (Figures 8g and 8h). At pentad 0, East Asian subtropical jet (EASJ) is stronger and extends more eastward than normal (Figure 8d).…”

Section: Resultsmentioning

confidence: 99%

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Flash Drought in the South of Yangtze River and the Potential Impact of North Atlantic Sea Surface Temperature

Ma,

Yuan,

et al. 2024

JGR Atmospheres

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Flash droughts (FDs), a type of drought with rapid onset, occurred in growing season have damaging impacts on crops, ecosystem and hence livelihoods. However, the associated physical mechanism were not well understood, which prohibits a skillful early warning. Based on the reanalysis data for 1961–2022, we diagnosed the characteristics, antecedent meteorological conditions and large‐scale atmospheric circulation of FDs over the region south of Yangtze River (SYR), a hotspot region of FDs. The FDs tend to occur during the periods before (i.e., from April to mid‐June) and after (i.e., early July–September) Meiyu season (B‐Meiyu and A‐Meiyu periods). Large precipitation deficits and rapid elevated temperature caused by anomalous subsidence and moisture divergence are responsible for the onset of FDs during the two periods. The North Atlantic tripole‐like sea surface temperature anomaly (SSTA) modes have potential impact on the anomalous circulations via modulating Rossby wave trains, but with different locations among the two periods. During B‐Meiyu period, the SSTA mode is characterized by positive SSTA over subtropical North Atlantic and negative SSTAs over the tropical and mid‐latitude ocean, triggering a “+ − + − + −” circulation pattern over North Atlantic–Eurasia, which reinforces the East Asian trough (EAT). Anomalous northeasterly winds dominate the SYR suppressing moisture transport from the tropics. The SSTA mode locates farther to the north during A‐Meiyu period, inducing a “+ − + − +” wave train over mid‐latitude North Atlantic‐Eurasia, leading to the strengthening of the western Pacific subtropical high. The high‐pressure anomalies control the SYR, resulting in anomalous subsidence and hence negative precipitation anomalies.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Flash Drought in the South of Yangtze River and the Potential Impact of North Atlantic Sea Surface Temperature

Ma,

Yuan,

et al. 2024

JGR Atmospheres

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“…Different levels of extreme precipitation events are categorized into various types based on large-scale circulation patterns [30][31][32]. This research explores the connection between extreme precipitation events, atmospheric rivers (ARs), and moisture contribution [33][34][35][36][37], using a moisture trajectory model to identify the primary moisture source of precipitation. Additionally, coupled models are employed to compare findings with Phase 6 of the project (CMIP6) model, analyzing various aspects such as the detection and attribution of extreme precipitation events [38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Variation and Causes of Typical Extreme Precipitation Events in Shandong Province over the Last 50 Years

Liu,

Li,

2024

Remote Sensing

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In this study, based on hourly ERA5 reanalysis data from July to September, from 1971 to 2020, for Shandong Province, we used mathematical statistical analysis, the Mann–Kendall nonparametric statistical test, cluster analysis, and other methods to extract and analyze the spatiotemporal variation characteristics and causes of typical extreme precipitation events. The results indicated the following: (1) The total number and duration of precipitation events show a nonsignificant upward trend, while the average and extreme rainfall intensities show a nonsignificant downward trend. (2) Extreme precipitation events are primarily concentrated in Qingdao, Jinan, Heze, and Binzhou, with fewer events occurring in central Shandong Province. (3) Extreme precipitation events are classified into four types (namely, patterns I, II, III, and IV). Pattern I exhibits two rain peaks, with the primary rain peak occurring after the secondary rain peak. Similarly, pattern II also displays two rain peaks, with equivalent rainfall amounts for both peaks. In contrast, pattern III has multiple, evenly distributed rain peaks. Finally, pattern IV shows a rain peak during the first half of the precipitation event. Pattern I has the highest occurrence probability (46%), while pattern IV has the lowest (7%). (4) The spatial distributions of the different rain patterns are similar, with most being found in the eastern coastal and western regions. (5) Extreme precipitation events result from interactions between large-scale circulation configurations and mesoscale convective systems. The strong blocking situation and significant circulation transport at middle and low latitudes in East Asia, along with strong convergent uplift, abnormally high specific humidity, and high-water-vapor convergence centers, play crucial roles in supporting large-scale circulation systems and triggering mesoscale convective systems.

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Persistent Variations in the East Asian Trough from March to April and the Possible Mechanism

Yu,

Sun

2024

Adv. Atmos. Sci.

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Strengthened influence of the East Asian trough on spring extreme precipitation variability over eastern Southwest China after the late 1980s

Cited by 5 publications

References 22 publications

Flash Drought in the South of Yangtze River and the Potential Impact of North Atlantic Sea Surface Temperature

Flash Drought in the South of Yangtze River and the Potential Impact of North Atlantic Sea Surface Temperature

Spatiotemporal Variation and Causes of Typical Extreme Precipitation Events in Shandong Province over the Last 50 Years

Persistent Variations in the East Asian Trough from March to April and the Possible Mechanism

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