Simultaneous modulations of precipitation and temperature extremes in Southern parts of China by the boreal summer intraseasonal oscillation

Chen, Yang; Zhai, Panmao

doi:10.1007/s00382-016-3518-4

Cited by 52 publications

(52 citation statements)

References 63 publications

(66 reference statements)

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“…In the lower troposphere, an anomalous cyclone/anticyclone pair related to the EAP teleconnection pattern results in strong southwesterlies from low-latitudes [45], advecting anomalously abundant moisture toward the YRV for several days during EAP/SR-C events, resulting in a more significant moisture flux with a magnitude anomaly more than 1.0σ above normal compared to single events (at 850 hPa in Figure 12). Meanwhile, northerly flows from the mid-latitudes, steered by the deep trough, prevail in the middle troposphere, promoting the southward intrusion of cooling/dry air from mid-high latitudes required by the frontogenesis into the YRV [43].…”

Section: Discussionmentioning

confidence: 99%

“…The diabatic heating anomalies and vertical velocity display almost out-of-phase variations, with the pronounced ascent of warm and moist air prevailing well over the YRV, and the descent of cold air between 10 • N and 22.5 • N in the coastal areas of southeast China. Currently, these above-mentioned ascending and descending motions, low-level strong southwesterlies to the northern flank of the WPSH (Figure 9), and upper-level northerlies to the northeast periphery of the SAH (Figure 4), form an anomalous thermal-inducing vertical circulation cell over East Asia [28,45]. This vertical circulation cell may be highly beneficial for the development and preservation of precipitation in the YRV [25,28].…”

Section: Low-level Moisture Transport and Vertical Motionmentioning

confidence: 99%

“…thermal-inducing vertical circulation cell over East Asia [28,45]. This vertical circulation cell may be highly beneficial for the development and preservation of precipitation in the YRV [25,28].…”

Section: Low-level Moisture Transport and Vertical Motionmentioning

confidence: 99%

See 2 more Smart Citations

Combined Effects of Synoptic-Scale Teleconnection Patterns on Summer Precipitation in Southern China

Wang

2018

Atmosphere

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Using ERA-Interim daily reanalysis and precipitation data, the combined effects of East Asia-Pacific (EAP) and Silk Road (SR) teleconnection patterns on summer precipitation in Southern China were investigated on synoptic to sub-monthly timescales. Combined EAP and SR patterns lead to more persistent and extreme precipitation in the Yangtze River Valley (YRV) and exhibit an obvious zonal advance between the South Asia High (SAH) and Western Pacific Subtropical High (WPSH) prior to its onset. During typical combined events, an overlap between the SAH and WPSH remains in a favorable position for Persistent Extreme Precipitation (PEP). Furthermore, SR-induced acceleration of the westerly jet stream and extra positive vorticity advection provide persistent upper-level divergence for YRV precipitation. An anomalous EAP-related cyclone/anticyclone pair over East Asia induces enhanced low-level southwesterlies to the northern anticyclone flank and northerlies from the mid-latitudes, advecting anomalously abundant moisture toward the YRV, resulting in clear moisture convergence. Moreover, the strong ascent of warmer/moister air along a quasi-stationary front may be crucial for PEP. During decay, the SAH and WPSH diverge from each other and retreat to their normal positions, and the strong ascent of warmer/moister air rapidly weakens to dissipation, terminating PEP in the YRV.

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Section: Discussionmentioning

confidence: 99%

Section: Low-level Moisture Transport and Vertical Motionmentioning

confidence: 99%

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Combined Effects of Synoptic-Scale Teleconnection Patterns on Summer Precipitation in Southern China

Wang

2018

Atmosphere

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“…Thus, more recent studies have adopted the two BSISO indices instead of the MJO index to examine the intra‐seasonal modulations of local weather/climate changes over the East Asian summer monsoon regions (e.g. Li et al ., ; Hsu et al ., ; Hung et al ., ; Chen and Zhai, ).…”

Section: Introductionmentioning

confidence: 99%

Impact of boreal summer intra‐seasonal oscillations on warm season diurnal convection activity in Taiwan

Huang

Chang

2017

Intl Journal of Climatology

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Diurnal convection (DC), which is characterized by rainy days with maximum rainfall during the afternoon without strong synoptic disturbances, is the most frequently observed weather system that affects local rainfall in Taiwan. In this study, we investigate the impact of boreal summer intra-seasonal oscillations (BSISOs) on the modulation of warm season (May-September) DC activities in Taiwan. Our analyses focus on (1) identifying the relationships between changes in DC characteristics (e.g. DC days and the mean rainfall intensities on DC days) and the phase evolutions of two types of BSISOs (including the 30-60-day ISO named BSISO1 and the 10-30-day ISO named BSISO2) and (2) the related maintenance mechanisms. Analyses of DC days demonstrate that the contribution of DC days to the total quantity of rainy days in Taiwan generally reaches a maximum value when Taiwan is being modulated by intensified southwesterly winds, intensified local sea breeze circulations, and intensified local thermal instabilities (i.e. phase 3 of BSISO1 and phase 7 of BSISO2). Analyses of the mean rainfall intensities on DC days show that maximum values are generally reached when the moisture convergence line propagates northwards over Taiwan (i.e. phase 1 of BSISO1 and phase 3 of BSISO2). Further examinations indicate that the abovementioned findings are not dependent upon the strengths of the BSISOs.

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“…Between two PHR events, known as the break phase, low precipitation or high temperature may occur. Therefore, HW events variation is also related to intraseasonal variability of atmospheric circulation (Chen and Lu, ; Xu and Lu, ; Chen et al ., , ; Chen and Zhai, ; Wang et al ., ; Diao et al ., ). Krishnan et al .…”

Section: Introductionmentioning

confidence: 99%

Influence of the South Asian high‐intensity variability on the persistent heavy rainfall and heat waves in Asian monsoon regions

Wang

Ren

Duan

et al. 2019

Intl Journal of Climatology

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This study investigates the modulation of the South Asian high's (SAH) intensity variation on the persistent heavy rainfall (PHR) and heat wave (HW) events over the Asian summer monsoon regions during summer 1979–2013. The first mode of an empirical orthogonal function (EOF) analysis performed on standardized subseasonal anomalies at 200‐hPa geopotential height over the SAH's main body (20°–5°N, 35°–110°E), reveals the intensity variation of the SAH with a 10–40‐day periodicity. The strengthening (weakening) of the SAH's main body is accompanied by negative (positive) outgoing longwave radiation (OLR) anomalies and more (less) anomalous rainfall over the Indian subcontinent, southern foot of Tibetan Plateau (TP) and subtropical East Asia. Using different thresholds, the proportion for modest PHR events is approximately 30% and can reach up to 40–50% for extreme PHR events during the strong phase of SAH. About 20% of modest PHR events and only 10% of extreme PHR events occur under the weak phase of SAH, suggesting that SAH has a more significant impact on the occurrence of extreme PHR events over the south and East Asian regions. In contrast, HW events associated with strong SAH account for approximately 5–10% whereas an increased occurrence of HW events is observed during the weak phase of SAH with a ratio up to 15–20%. A much more intensified updraft flow, enhanced cross‐equatorial moisture flux and western North Pacific moisture flux is accompanied with strong SAH, which provide favourable conditions for occurrence of extreme PHR events, leading to less surface solar radiation anomalies. The mirror image is seen in the weak SAH phase, contributing to the decrease of extreme PHR events and increase of HW events. The above analysis indicates that the SAH provides significant modulation and impact on extreme rainfall and temperature events over the Asian monsoon regions on subseasonal timescale.

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Simultaneous modulations of precipitation and temperature extremes in Southern parts of China by the boreal summer intraseasonal oscillation

Cited by 52 publications

References 63 publications

Combined Effects of Synoptic-Scale Teleconnection Patterns on Summer Precipitation in Southern China

Combined Effects of Synoptic-Scale Teleconnection Patterns on Summer Precipitation in Southern China

Impact of boreal summer intra‐seasonal oscillations on warm season diurnal convection activity in Taiwan

Influence of the South Asian high‐intensity variability on the persistent heavy rainfall and heat waves in Asian monsoon regions

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