Circulation anomalies associated with interannual variation of early- and late-summer precipitation in Northeast China

Shen, Baizhu; Lin, Zongkai; Lu, Riyu; Liu, Yi

doi:10.1007/s11430-011-4173-6

Cited by 101 publications

(82 citation statements)

References 13 publications

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“…For instance, Liang et al (2011) attributed the decrease in the mean annual and summer precipitation over NEC during 1961NEC during -2008 to the combined effects of the EASM and complex topography. Shen et al (2011) indicated that the inter-annual variation of precipitation over NEC is mainly dominated by a cold vortex in early summer (May and June) and by the EASM in late summer (July and August). Generally, more summer precipitation in NEC co-varies with a strong northeast cold vortex, which is connected with the Northern Hemisphere Annual Mode in February (He et al, 2006) and the winter North Pacific Oscillation (NPO; Liu et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Recent changes in summer precipitation in Northeast China and the background circulation

Han

Chen

Wang

2015

Intl Journal of Climatology

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This study documents recent changes in the characteristics of summer (July-August-September) precipitation in Northeast China (NEC). A significant shift to less precipitation occurred in 1999-2012 as compared with that in 1984-1998. The reduced precipitation in the later period is closely associated with the large-scale anomalous high pressure over East Asia and anomalous descending motion over NEC. Furthermore, the significant reductions in the total cloud cover and moisture content also contribute to the reduced precipitation over NEC. To investigate the possible mechanism for the decadal shift of summer precipitation, a northeast Asian summer monsoon (NEASM) index is defined to describe the monsoon circulation over NEC. The results indicate that the NEASM has weakened since 1999 and is concurrent with the shift of the Pacific Decadal Oscillation (PDO) to the negative phase. Warming sea surface temperature (SST) in the North Pacific can zonally reduce the land-sea thermal contrast and lead to a weak NEASM. Further investigation indicates that the negative phase of the PDO has significant impacts on the atmospheric circulation associated with the NEASM. Additionally, changes in synchronous Arctic sea ice cover (SIC) also likely induce an anomalous sinking movement and weaken water vapour transport; thus, the summer precipitation over NEC decreases.

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Section: Introductionmentioning

confidence: 99%

Recent changes in summer precipitation in Northeast China and the background circulation

Han

Chen

Wang

2015

Intl Journal of Climatology

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“…Summertime mean vertically integrated water vapor (VIWV) flux shows the major water vapor transports and sources over NEC (Figure c). Northeastward VIWV transports indicate that EASM and East Asian jet stream play a crucial role to changes in precipitation across NEC (Shen et al ., ). Furthermore, southward bend of VIWV flux over northern NEC may suggest that the mid‐high latitude circulations induced by Arctic sea ice cover also change VIWV transports (Han et al ., ).…”

Section: Resultsmentioning

confidence: 97%

“…The annual and summer rainfall over NEC characterizes a significantly spatial inhomogeneity with multiple timescales derived from combined impacts of the complex topography and EASM (Liang et al ., ), as well as COLs (Shen et al ., ), and these features are different with the variability of precipitation over northern and southern China (Gao et al ., ; Han et al ., ; Sun et al ., ). Summertime climate characteristics in NEC during 1960–2015 are illustrated in Figure .…”

Section: Resultsmentioning

confidence: 98%

“…Rainfall is mainly concentrated in summer, and the summertime precipitation accounts for approximately 65.7% of annual total rainfall in NEC (Liang et al ., ). The changes in floods derived from summertime extreme precipitation events are therefore the majority of severe natural hazards, resulting in substantial impacts on local crop safety, agriculture, economic society and the eco‐environment (Shen et al ., ; Du et al ., ; Han et al ., ). For example, extreme rainfall caused severe floods in August 2013 over NEC and led to 81 casualties and 97 unaccounted people, total economic loss was estimated to be approximately 2.6 billion USD (Gao et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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Contribution of large‐scale circulation anomalies to variability of summer precipitation extremes in northeast China

Cao

et al. 2018

Atmospheric Science Letters

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We propose a short-lived extreme precipitation event, which is identified by the definition of 75th and 95th percentile using gauge observations across northeast China (NEC). Atmospheric variables from reanalysis dataset are then composited to examine the contribution of synoptic-scale circulations to variations in extreme events. Results show that the divergence aloft combined with lower pressures at surface lead to upward vertical motion of circulations, along with flow around lowpressure area and high pressure to east NEC derived from associated wavetrain conveying efficient moisture, providing favorable environment for occurrence of precipitation extremes. The northwestward shift of western Pacific subtropical high, together with northward shifted position of upper-level westerlies over NEC, results in the strengthened southwesterly, which transports more moisture into NEC and produces extreme rainfall. Moreover, the stronger anomalies of dynamical quantities present for 95th percentile cases. The roughly same percentage of summertime short-lived extreme events related to cut-off lows (COLs) is found for both percentile composites, 21.2% (79 out of 373) and 21.1% (77 out of 365) for 75th and 95th percentile events, respectively. Overall, the contribution of COLs to short-lived extreme precipitation is insignificant during 1960-2015 in NEC, although COLs have been documented to be more active in summer over NEC. The time series of COL-induced events exhibits inter-annual variability with not statistically significant linear trend, suggesting that COLs play a tiny role to the slightly decreasing trend of short-lived precipitation events over NEC.

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“…The interdecadal moisture variations in this region are also modulated by the phase changes of the Pacific Decadal Oscillation (Ma, ; Qian and Zhou, 2014). Unlike North China, moisture in Northeast MA is also associated with a cold vortex nearby that favours enhanced rainfall, especially in early summer (Shen et al , ).…”

Section: Resultsmentioning

confidence: 99%

Interdecadal moisture patterns and teleconnections in Monsoonal Asia over the past seven centuries

Zhou

Fang

Zhang

et al. 2016

Intl Journal of Climatology

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Interdecadal (10‐ to 100‐year oscillation) moisture variations over the Monsoonal Asia (MA) is highly variable across regions and time, which are relatively less understood due to the shortness of the instrumental data of a few decades. In this study, comprehensive investigations on the spatiotemporal distributions of the interdecadal moisture variations over MA as well as their evolution from prior to the industrial era were conducted utilizing the tree‐ring based drought reconstructions, i.e. the Monsoonal Asia Drought Atlas. Nine interdecadal moisture patterns in MA are identified using the self‐organizing map based on the ensemble empirical mode decomposition. To further investigate these interdecadal moisture patterns, we aggregated the selected nine nodes into four patterns using a hierarchical clustering approach. Among them, Pattern 1 stands for a teleconnection between the Northeast MA and the Indian Peninsula, and Pattern 2 represents a dipole pattern between the Southern and Northern MA. We find that Pattern 1 may be linked with the dynamics of the Antarctic Oscillation that can modulate the strength of the Asian summer monsoon through meridional teleconnections. Pattern 2 is mainly driven by the elevated El Niño‐Southern Oscillation variance and the zonal ‘Silk Road Pattern’ to bridge this interdecadal modulation.

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Circulation anomalies associated with interannual variation of early- and late-summer precipitation in Northeast China

Cited by 101 publications

References 13 publications

Recent changes in summer precipitation in Northeast China and the background circulation

Recent changes in summer precipitation in Northeast China and the background circulation

Contribution of large‐scale circulation anomalies to variability of summer precipitation extremes in northeast China

Interdecadal moisture patterns and teleconnections in Monsoonal Asia over the past seven centuries

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