Summer Climate Variability in China and Its Association with 500 hPa Height and Tropical Convection

Nitta, Tsuyoshi; Hu, Zeng‐Zhen

doi:10.2151/jmsj1965.74.4_425

Cited by 227 publications

(149 citation statements)

References 20 publications

Supporting

Mentioning

124

Contrasting

Unclassified

Order By: Relevance

“…Many studies (e.g. Lau, 1992;Yatagai and Yasunari, 1994;Nitta and Hu, 1996;Weng et al, 1999) have shown that the observed precipitation exhibits strong interannual and interdecadal variations, as well as a long-term dry trend in East Asia. Meanwhile, different climate anomaly signatures appear over different parts of China (e.g.…”

Section: Introductionmentioning

confidence: 99%

Variabilities of the spring river runoff system in East China and their relations to precipitation and sea surface temperature

Chen

Wang

Xue

et al. 2008

Intl Journal of Climatology

View full text Add to dashboard Cite

ABSTRACT:The annual cycle and variabilities of the spring river runoff in East China (EC) at the continental scale and their relationship with precipitation, sea surface temperature (SST), and El Niño-Southern Oscillation (ENSO) are investigated. Monthly mean data from 72 runoff stations and 160 precipitation stations in EC, covering a period between 1951 and 1983, are used for this study. The seasonal evolution of runoff depth is generally consistent with that of the rainfall but has more regional characteristics. The dominant spatial patterns and temporal variations of spring runoff and precipitation are studied with the empirical orthogonal function (EOF) analysis. The leading EOFs of spring runoff and precipitation show the intensity of runoff and precipitation in South China and are highly correlated with each other, indicating a direct response of runoff to precipitation, which is different from the summer situation. Statistic analysis suggests that the evolution of ENSO event may exert a strong influence on these two modes. The second EOFs of runoff and precipitation present a north-south oscillation in EC with Nanling Mountain as the boundary and are also well correlated. These modes are highly related to the distribution of topography and may not be influenced by the ENSO. The third EOFs exhibit east-west oscillations in EC in both runoff and precipitation. The interdecadal relationship between spring precipitation/runoff and SST is further studied by singular value decomposition (SVD) analysis. The results indicate that the first coupled mode is dominant with the associated SST anomalies as an ENSO-like interdecadal SST signal and indicates pronounced warming (SST) and wetting (runoff) trends in North China after the mid-1970s, consistent with the observed trends of SST and runoff. The second coupled mode links the subtropical SST to the main spring runoff EOF mode in South China.

show abstract

Section: Introductionmentioning

confidence: 99%

Variabilities of the spring river runoff system in East China and their relations to precipitation and sea surface temperature

Chen

Wang

Xue

et al. 2008

Intl Journal of Climatology

View full text Add to dashboard Cite

show abstract

“…Although driven by seasonal march of solar radiation, the East Asian summer monsoon (EASM) is characterized by the multi-scale interaction between the synoptic, intraseasonal, interannual, interdecadal, and centennial time scales (Ding 1992;Nitta and Hu 1996;Weng et al 1999;Qian et al 2002). One marked characteristics of the EASM is the meridionally narrow rain bands, which tend to lie zonally, with a spatial scale of several thousand kilometers.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the 1998 East Asian Summer Monsoon using the Purdue Regional Model

Hsu

Kau

et al. 2004

Journal of the Meteorological Society of Japan

View full text Add to dashboard Cite

This study used the Purdue Regional Model to simulate the 1998 EASM to assess the model performance. The results indicated that the model was capable of simulating the overall characteristics of the 1998 EASM on the seasonal, intraseasonal, onset, and daily time scales. On the seasonal time scale, the model tended to produce more precipitation over the land and less precipitation over the ocean. This land-sea contrast in the model performance was consistent with the stronger-than-observed Pacific anticyclone in the simulation. It appears that the over simulated anticyclone was also found in other models, and is not a unique problem to the PRM. Future studies are needed to tackle this seemingly fundamental problem in several regional models.The model simulated the seasonal march of the EASM well, characterized by northward-propagating rain bands. Intraseasonal oscillation events propagating northward were also well reproduced. These results confirm that the model is capable of producing realistic sub-seasonal variability in the inner domain, once the proper lateral boundary forcing is provided.The model correctly simulated the onset timing and dramatic changes before and after the onset. However, the model incorrectly simulated the circulation and precipitation during the onset, because it failed to simulate the rapid development of a weak trough in the northern South China Sea. After the onset period, the model performance became reliable again. This indicates that the model is capable of fixing the existing large biases, with the proper lateral boundary forcing.This model was able to simulate the gross fluctuation in the regional-averaged daily precipitation, although it missed some extreme events that resulted in flooding in China. The incorrect simulation of these extreme events was partially responsible for the biases in the simulated seasonal precipitation. It is suggested that a regional model should be able to simulate the multi-scale features from the daily to seasonal time scales and their mutual interaction to correctly simulate the monthly and seasonal mean fields.

show abstract

“…Spectral analysis of China rainfall by Chen et al (1991) showed that the dominant periods are the quasi-biennial oscillation (QBO), 3.5 years and 5.5 years. A recent study by Nitta and Hu (1996) demonstrated that a decreasing trend, QBO signals and decadal variations are significant in the summer rainfall over China.…”

Section: Introductionmentioning

confidence: 99%

Wavelet Analysis of Summer Rainfall over North China and India and SOI Using 1891-1992 Data

Nitta

1996

Journal of the Meteorological Society of Japan

Self Cite

View full text Add to dashboard Cite

Localization of interannual and decadal variations of summer rainfall in North China and India and seasonal mean Southern Oscillation Index (SOI) from , and the favored time scales of the significant correlations among them are investigated with the wavelet transform (WT) analysis method. Strong localization and non-stationary evolution in the interannual and decadal variations of the rainfall in North China and India are demonstrated. The dominating time scales in the rainfall variations in North China and India are mainly located in two time scale bands: shorter than 10 years, and 14-28 years. The correlations between the rainfall variations in North China and India are time-scale dependent. The significant positive correlations are concentrated in two time-scale bands: shorter than 7 years and longer than 14 years. The correlations are insignificant on time scales of 7-14 years.El Nino and Southern Oscillation (ENSO) cycle is a nonstationary process. The dominant time scales for the variation of SOI are shorter than 5-7 years, and the decadal variations are obvious in 1891-1915 and 1970-1992. There is strong interaction between the Indian summer monsoon and the ENSO cycle. The significant positive correlations are mainly focused on the time scales shorter than 24-30 years, and the significant negative correlations on time scales longer than 40 years in summer and winter SOI cases. The correlation between the rainfall variations in North China and the ENSO cycle in various seasons are less significant, more scattered and complex, but there are some similarities in the correlation pattern compared with that of India, especially in the shorter time scales.The calculation shows that the summer rainfall variations in North China and India at different time scales are related with different general circulation anomalous patterns in middle and high latitudes of Eurasia and the western Pacific. The correlation patterns over Eurasia and the western Pacific between the summer rainfall variations in North China or India and the geopotential height at 500hPa are similar to the correlation patterns between the geopotential height and the WT results of the rainfall on time scales of about 5 years, but different from those on time scales of about 11 years.Therefore, the similar behavior between the rainfall variations in North China and India may be caused by the similar associations between the rainfall variations and the ENSO cycle and the general circulation anomalies in middle and high latitudes over Eurasia and the western Pacific, and the difference may be related to the different character of these associations.

show abstract

Summer Climate Variability in China and Its Association with 500 hPa Height and Tropical Convection

Cited by 227 publications

References 20 publications

Variabilities of the spring river runoff system in East China and their relations to precipitation and sea surface temperature

Variabilities of the spring river runoff system in East China and their relations to precipitation and sea surface temperature

Simulation of the 1998 East Asian Summer Monsoon using the Purdue Regional Model

Wavelet Analysis of Summer Rainfall over North China and India and SOI Using 1891-1992 Data

Contact Info

Product

Resources

About