How East Asian westerly jet’s meridional position affects the summer rainfall in Yangtze-Huaihe River Valley?

Wang, Shixin; Zuo, Hongchao; Zhao, Shanshan; Zhang, Jiankai; Sha, Liqing

doi:10.1007/s00382-017-3591-3

Cited by 35 publications

(23 citation statements)

References 22 publications

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“…Many other studies have also confirmed that most extreme precipitation events over the NCP are concentrated in the period from mid‐July to mid‐August (Li & Wang, ). The 30‐day period from the second half of July to the first half of August is defined as midsummer over eastern China (Wang et al, ; Wang & Zuo, ). Thus, in this study, we define the period from 15 July to 15 August as midsummer to capture the most frequent period of extreme precipitation over the NCP.…”

Section: Introductionmentioning

confidence: 99%

The Large‐Scale Circulation Patterns Responsible for Extreme Precipitation Over the North China Plain in Midsummer

Zhao

Li³

et al. 2019

JGR Atmospheres

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Extreme precipitation events over the North China Plain (NCP) in midsummer during 1979–2016 are classified into two types using objective cluster analysis: a northern pattern with heavy precipitation and a central–southern pattern with relatively moderate precipitation. The large‐scale circulation patterns responsible for the midsummer extreme precipitation are then determined. In the northern NCP type, extreme precipitation accompanies a zonal gradient between an anomalous low‐pressure system at high latitudes and the westward‐ and northward‐extended western North Pacific subtropical high (WNPSH). Anomalous southwesterlies flow is driven by a trough that extended from the high latitudes to the northern NCP, where it encounters southeasterly wind flow induced by an anomalously northward‐extended WNPSH and a southern low‐pressure anomaly at low latitudes. Anomalous amounts of moisture are mainly transported from the tropical western Pacific by southeasterlies. In the central–southern NCP type, remarkable anomalous low‐pressure systems control all of northern China with centers over the Sichuan Basin and northeast China. The westward‐extended WNPSH occupies further south than that of the northern NCP type. The southwesterly low‐level jet (LLJ) is more prevalent in the central–southern NCP type than in the northern NCP type. This southwesterly LLJ plays an important role in extreme precipitation over the central–southern NCP by transporting moisture primarily from the Bay of Bengal and the South China Sea and generating convergence. In addition, the upper‐level anomalous strong divergence that is anchored over the right entrance of the westerly jet makes a greater contribution to extreme precipitation in the northern type than in the central–southern type.

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Section: Introductionmentioning

confidence: 99%

The Large‐Scale Circulation Patterns Responsible for Extreme Precipitation Over the North China Plain in Midsummer

Zhao

Li³

et al. 2019

JGR Atmospheres

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“…During the warming period, the EAWJ shows a decreasing trend, which results in a stronger mixing of cold and warm air and leads to an increase in rainfall (Figure 5a). Studies also observed that the north and south displacement of the EAWJ also has an influence on the rainfall pattern [33][34][35]. During the hiatus period, the EAWJ moves northward, accompanied by anomalous convergence over the middle and high latitudes and anomalous divergence over the lower latitudes in the upper level, which results in increasing upward motion in the Huang-Huai River region and downward motion in the Yangtze River region and causes the rainfall belt to shift from the Yangtze River region to the Huang-Huai River region during this period ( Figure 5b).…”

Section: Variation In Summer Rainfall During the Warming And Hiatus Pmentioning

confidence: 99%

Variation in Summer Rainfall over the Yangtze River Region during Warming and Hiatus Periods

Qiu

Zhou

2019

Atmosphere

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Variation in summer precipitation over the Yangtze River region during a global warming period (1976−1997) and a hiatus period (1998−2013) are investigated in this study. The results show that during the warming period, precipitation over both the Yangtze River region and South China shows an increasing trend, attributable to increasing ascending motion, a decreasing East Asian westerly jet (EAWJ), and a decreasing temperature gradient. During the hiatus period, the rainfall belt moves from the Yangtze River region to the Huang-Huai River region in association with the northward displacement of the EAWJ, attributable to the increasing trend in the temperature gradient at high latitudes. Empirical orthogonal function (EOF) analysis is one of the widely used methods in atmospheric science. It is also known as principal component analysis (PCA). The second EOF mode of summer precipitation can represent the variation in rainfall over the Yangtze River region. During the warming period, rainfall over the Yangtze River region is controlled by a dipole mode of water vapor transport, induced by SST cooling in the Maritime Continent, which can lead to a strong Pacific–Japan teleconnection; warming SST in the east-central tropical Pacific can also strengthen this pattern. During the hiatus period, the Pacific–Japan pattern is weak, and the water vapor transport pattern over the western subtropical Pacific changes from a dipole structure to a weak monopole structure.

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“…e upper-level westerly jet (WJ) is a planetary-scale atmospheric circulation system in the upper troposphere and is an important circulation system that affects the weather and climate in East Asia [18][19][20][21][22][23]. Hence, numerous researchers have studied the WJ [24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Impact of the Westerly Jet on Rainfall/Runoff in the Source Region of the Yangtze River during the Flood Season

Lai

Gong

Cen

et al. 2020

Advances in Meteorology

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Based on runoff data collected at the Zhimenda station, reanalysis data from the National Centers of Environmental Prediction/National Centers of Atmospheric Research (NCEP/NCAR), and observation data from ground stations in China, this study analyzes the characteristics of changes in runoff in the source region of the Yangtze River (SRYR) during the flood season (from July to September), the relationship between runoff and antecedent rainfall, and the impact of the westerly jet (WJ) on rainfall in the coastal zone of the SRYR. The results show the following. The runoff in the SRYR displays a significant interannual and interdecadal variability. The runoff in the SRYR during the flood season is most closely related to 15-day (June 16 to September 15) antecedent rainfall in the coastal zone of the SRYR. In turn, the antecedent rainfall in the coastal zone of the SRYR is mainly affected by the intensity of the simultaneous WJ over a key region (55–85°E, 45–55°N). When the intensity of the WJ over the key region is greater (less) than normal, the jet position moves northward (southward), and the easterly (westerly) wind anomalies over the region to the west of the SRYR become unfavorable (favorable) to the transport of water vapor from high-latitude regions to the SRYR. In addition, the southerly wind over the equatorial region cannot (can) easily advance northward, which is unfavorable (favorable) to the northward transport of water vapor from the low-latitude ocean. Hence, these conditions result in a decrease (increase) in the water vapor content in the SRYR. Furthermore, the convergence (divergence) anomalies in the upper level and the divergence (convergence) anomalies in the lower level result in the descending (ascending) motion over the SRYR. These factors decrease (increase) the rainfall, thereby decreasing (increasing) the runoff in the SRYR during the flood season.

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How East Asian westerly jet’s meridional position affects the summer rainfall in Yangtze-Huaihe River Valley?

Abstract: negative); there is not much difference in these processes between early summer and midsummer.

Cited by 35 publications

References 22 publications

The Large‐Scale Circulation Patterns Responsible for Extreme Precipitation Over the North China Plain in Midsummer

The Large‐Scale Circulation Patterns Responsible for Extreme Precipitation Over the North China Plain in Midsummer

Variation in Summer Rainfall over the Yangtze River Region during Warming and Hiatus Periods

Impact of the Westerly Jet on Rainfall/Runoff in the Source Region of the Yangtze River during the Flood Season

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