1Ha Noi University of Natural Resources and Environment

2National Center for Hydro-Meteorological Forecasting


The research uses synoptic station data and MJO index to analyse the precipitation distribution all over Viet Nam. The mean rainfall amount in the Northern region tends to increase in MJO phases 1 and 2; the rainfall anomalies in the North Central provinces are positive in phases 3, 4 and 5; from Middle Central to Southern provinces, MJO increases the rainfall, especially in phases 4 and 5. During transitional seasons (MAM and SON), positive rainfall anomalies in those wet phases tend to be higher than those in summer and winter, especially in SON.


Cite this paper

Le Minh Duc, Le Thi Hong Van, Hoang Phuc Lam (2019),  Observed Precipitation Characteristics in MJO Phases of Viet Nam. Vietnam Journal of Hydrometeorology, 02, 51-63.


1. Ding, Y.H., 1994. Monsoons over China, Kluwer Academic Publishers, Dordrecht/ Boston/ London, pp. 419.

2. Donald, A., Meinke, H., Power, B., Maia, A.H.N., Wheeler, M.C., White, N., Stone, R.C., Ribbe, J., 2006. Near-global impact of the Madden-Julian Oscillation on rainfall. Geophysical Research Letters, 33 (9): L09704, doi:10.1029/2005GL025155.

3. Goswami, B.N., Ajayamohan, R.S., Xavier, P.K., Sengupta, D., 2003. Clustering of low pressure systems during the Indian summer monsoon by intraseasonal oscillations. Geophysical Research Letters, 30 (8): 1431. doi:10.1029/ 2002GL016734.

4. Madden, R.A., Julian, P.R., 1971. Detection of a 40-50 day oscillation in the zonal wind in the tropical Pacific. J. Atmos. Sci., 28: 702- 708.

5. Murakami, T., Nakazawa, T., He, J., 1984. On the 40-50 day oscillations during the 1979 Northern Hemisphere summer. Part I: Phase propagation. J. Meteorol. Soc. Jpn., 62: 440-467.

6. Wang, B., Webster, P., Kikuchi, K., Yasunari, T., Qi, Y., 2006. Boreal summer quasimonthly oscillation in the global tropics. Clim. Dyn., 27: 661-675.

7. Wheeler, M.C., Hendon, H.H., 2004. An All-Season Real-Time Multivariate MJO Index: Development of an Index for Monitoring and Prediction. Monthly Weather Review, 132 (8): 1917-1932.

8. Yasunari, T., 1979. Cloudiness fluctuations associated with the Northern Hemisphere summer monsoon. J. Meteorol. Soc. Jpn. 57: 227- 242.

9. Zhan, R., Li, J., Gettelman, A., 2006. Intraseasonal variations of upper tropospheric water vapor in Asian monsoon region, Atmos. Chem. Phys. Discuss. 6: 8069-8095. doi:10.5194/acpd-6-8069-2006.

10. Zhang, L., Wang, B., Zeng, Q., 2009. Impact of the Madden-Julian Oscillation on sum-mer rainfall in southeast China. J. Clim. 22: 201- 216.

11. Zhu, C., Tetsuo, N., Li, J., 2003a. Modulation of twin tropical cyclogenesis by the MJO westerly wind burst during the onset period of 1997/98 ENSO, Adv. Atmos. Sci. 20 (6): 882- 898.

12. Zhu, C., Tetsuo, N., Li, J., Chen, L., 2003b. The 30-60 day intraseasonal oscillation over the western North Pacific Ocean and its impacts on summer flooding in China during 1998, Geophys. Res. Lett. 30 (18): 1952. doi:10.1029/2003GL017817.