The impacts of moisture transport of East Asian monsoon on summer precipitation in Northeast China

Using precipitation data from weather stations in China and reanalysis data from National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR), the inter‐annual and inter‐decadal variability of early‐summer (May–June) and late‐summer (July–August) precipitation (hereinafter referred to as MJP and JAP, respectively) over northeast China (NEC) and their background circulation during 1951–2016 were analysed. The following new findings have been highlighted: (a) There are significantly different inter‐annual and inter‐decadal variability characteristics between MJP and JAP over NEC. The inter‐annual variability of MJP is independent from that of JAP, while the inter‐decadal variability of the former is opposite to that of the latter. A significant shift to more MJP (less JAP) occurred in the early 2000s (late 1990s). (b) In terms of the inter‐annual timescale, the large‐scale atmospheric circulations‐associated MJP is notably different from JAP over NEC. The variation in MJP is mainly dominated by the northeast China low (NECL) and the Okhotsk blocking high (OBH), while JAP is mainly influenced by the western Pacific subtropical high (WPSH), the NEC south wind (NESW), and the NECL. (c) On the inter‐decadal timescale, MJP is associated with the inter‐decadal variation of the East Asia/Pacific (EAP) teleconnection, while JAP is closely related to the inter‐decadal variation of the NECL and NESW. When the EAP is in a positive phase, MJP is more than average. Furthermore in late summer, the strong NECL and NESW are both of benefit to the convergence of water vapour from the tropical southwest and East Asian subtropical westerlies over NEC, which contributes to the more JAP than average.

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“…Thus, the inter‐annual JAP is mainly dominated by the WPSH and NESW. Also, the active NECL is in favour of the more JAP (Sun et al, ; ).…”

Section: Associated Atmospheric Circulation Anomalies With Inter‐annumentioning

confidence: 99%

Inter‐annual and inter‐decadal variability of early‐ and late‐summer precipitation over northeast China and their background circulation

Zhao

Zhou

Yang

et al. 2018

Intl Journal of Climatology

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“…Some studies have indicated that the summer precipitation in NEC is affected by many factors, including the East Asian summer monsoon (EASM; Sun et al, 2007), cold vortices (Zhao and Sun, 2007;Hu et al, 2010), preceding sea surface temperature anomalies (SSTA) in key areas that include the southwest Indian Ocean and the north and equatorial Atlantic Ocean (Feng et al, 2006), and the dipole anomaly of summer Arctic atmospheric variability (Wu et al, 2008). 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.…”

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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“…Through empirical orthogonal function analysis of summer rainfall in Northeast China, Sun et al [5] identified that the first leading mode depicts coherent variation in the whole region of Northeast China, and the associated moisture mainly originates from the tropical South China Sea, the South Asian monsoon region and the subtropical western North Pacific [6]. Because of the onset of the EASM in Northeast China in late July, the southerly brings a large amount of moisture and starts the rainy season in Northeast China.…”

mentioning

confidence: 99%

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

Shen

Lin

et al. 2011

Sci. China Earth Sci.

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101

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The impacts of moisture transport of East Asian monsoon on summer precipitation in Northeast China

Cited by 50 publications

References 14 publications

Inter‐annual and inter‐decadal variability of early‐ and late‐summer precipitation over northeast China and their background circulation

Inter‐annual and inter‐decadal variability of early‐ and late‐summer precipitation over northeast China and their background circulation

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

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

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