Time and Space Structure of Interannual Variations in Summer Rainfall over China

Tian, Shao-Fen; Yasunari, Tetsuzo

doi:10.2151/jmsj1965.70.1b_585

Cited by 58 publications

(35 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is a pattern of monsoon snow cover in 2002,2004,2008, and to some degree also in 2006. This remarkable two year periodicity corresponds to the biennial character of the Indian monsoon that was described for instance by Mooley and Parthasarathy [18], Tian and Yasunari [19] and Gang and Li [20]. This biennial trend can also be seen clearly in Table 1 for the classes ‗monsoon' and ‗autumn'.…”

Section: Resultssupporting

confidence: 66%

Temporal and Spatial Aspects of Snow Distribution in the Nam Co Basin on the Tibetan Plateau from MODIS Data

et al. 2010

View full text Add to dashboard Cite

Large areas of the Tibetan plateau are only covered by a sparse network of ground snow sampling stations, while the snow cover is highly heterogeneously distributed due to wind, topography etc. Nevertheless, the snow accumulation and spatial patterns play an important role in the hydrological cycle. It releases moisture during the dry spring period before the onset of the monsoon season. Widely used MODIS snow cover products have been available globally since 2002. The understanding of the temporal and spatial distribution of snow cover in a given region calls for a comprehensive data representation method. In this paper a method to visualize both spatial and temporal aspects of snow cover distribution from MODIS 8-day composite data is presented. It is based on RGB display of the snow cover data which is grouped according to season. The RGB syntheses of snow cover distribution (RSD) were generated for the Nam Co induced by the passing of dry and cold westerlies over the lake surface during the winter months. The years 2002The years , 2006The years and 2007 were identified as years with a particularly strong lake effect from the RSD images. Areas with permanent snow cover and areas that were snow free were both found to be relatively stable. Comparison of the lake effect at Nam Co with nearby Siling Co, where the lake effect is smaller or absent, suggests that the presence of an effective barrier on the opposite side of the lake is a prerequisite for the occurrence of the strong lake effect.

show abstract

Section: Resultssupporting

confidence: 66%

Temporal and Spatial Aspects of Snow Distribution in the Nam Co Basin on the Tibetan Plateau from MODIS Data

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The latter needs to be examined more thoroughly using longer time series and therefore will not be discussed further in this study. It is evident that both the first and second EOF show a clear signal of biennial oscillation, which is similar to results of Tian and Yasunari (1992). The biennial signal is particularly strong for the first EOF during the period from late 60's to mid-80's.…”

Section: Interannual Variability Of the Easm Rainfallsupporting

confidence: 82%

Biennial Oscillation Associated with the East Asian Summer Monsoon and Tropical Sea Surface Temperatures

Shen

Lau

1995

Journal of the Meteorological Society of Japan

191

118

View full text Add to dashboard Cite

In this paper, the interannual variability of the East Asian summer monsoon (EASM) rainfall and the tropical sea surface temperature (SST) have been studied. It is found that the EASM rainfall possesses a strong biennial signal, which is particularly pronounced over the southeast China. For the SST, the biennial oscillation is the second most significant quasi-periodic signal over the entire tropical Indian and Pacific Oceans. Results indicate that the biennial variations in the SST and EASM rainfall are closely linked. The SST pattern which is best correlated with EASM rainfall appears in the form of a double see-saw with quasi-stationary centers of action over the Indian Ocean, the Asian monsoon region and the eastern Pacific. The most pronounced SST signals are found in the equatorial eastern Pacific and Indian Ocean about two seasons preceding and following the EASM rainfall.Evidence is presented suggesting that the biennial variability of the EASM rainfall is phase-locked to a global scale biennial oscillation involving the interplay of the Asian monsoon, the Hadley and Walker circulations, and basin wide fluctuations in SST. In particular, the eastward propagation of tonal wind anomalies from the Indian Ocean to the western Pacific, which regulates the moisture fluxes from the western Pacific to the East Asian region, appears to be a key component of the biennial fluctuation associated with EASM rainfall. Results suggest that the relationship between the Asian monsoon and tropical SST is more robust in the biennial than the ENSO time scale, hence raising the possibility that the biennial oscillation may be more fundamentally related to monsoon-ocean-atmosphere interaction than ENSO itself.

show abstract

“…The strong interaction between the Asian summer monsoon and the ENSO cycle have been demonstrated by Yasunari (1991), Tian and Yasunari (1992), Yang (1996) and the present analysis. However, it is not clear in which time scale they are closely related to each other.…”

Section: Wt Analyses Of the Rainfall Variations Over North China And supporting

confidence: 77%

“…7. These correlation patterns are very similar to those between sea surface tem- perature (SST) in eastern (western) tropical Pacific and Indian summer monsoon rainfall given by Yasunari (1991), and between the SOI and time coefficients of EOF for China summer rainfall (Tian and Yasunari, 1992) . Significant positive correlations exist between the Indian monsoon rainfall and the SOI in summer (JJA) and the following seasons: autumn (SON), winter (DJF) in the same year, and spring (+MAN) in the following year (Fig.…”

Section: Wt Analyses Of the Rainfall Variations Over North China And supporting

confidence: 67%

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

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

Time and Space Structure of Interannual Variations in Summer Rainfall over China

Cited by 58 publications

References 12 publications

Temporal and Spatial Aspects of Snow Distribution in the Nam Co Basin on the Tibetan Plateau from MODIS Data

Temporal and Spatial Aspects of Snow Distribution in the Nam Co Basin on the Tibetan Plateau from MODIS Data

Biennial Oscillation Associated with the East Asian Summer Monsoon and Tropical Sea Surface Temperatures

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

Contact Info

Product

Resources

About