A distinction between summer rainy season and summer monsoon season over the Central Highlands of Vietnam
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The daily rainfall data at 13 stations over the Central Highlands (CH) Vietnam were collected for the period 1981–2014. Two different sets of criteria using daily observed rainfall and 850 hPa daily reanalysis wind data were applied to determine the onset (retreat) dates of the summer rainy season (RS) and summer monsoon (SM) season, respectively. Over the study period, the mean RS and SM onset dates were April 20 and May 13 with standard deviations of 17.4 and 17.8 days, respectively. The mean RS and SM retreat dates were November 1 and September 30 with standard deviations of 17.9 and 10.2 days, respectively. The year-to-year variations of the onset dates and the rainfall amount within the RS and SM season were closely linked with the preceding winter and spring sea surface temperature in the central-eastern and western Pacific. It was also found that the onset dates were significantly correlated with the RS and SM rainfall amount.
We would like to acknowledge the constructive comments of the reviewers. This research is funded by the Vietnam National University, Hanoi (VNU), under project number QG.15.06, and supported by the French consortium of the University of Science and Technology of Hanoi (USTH). We would like to thank Dr. Kim C. Nguyen, CSIRO Australia, and Dr. Dzung Nguyen-Le, Hokkaido University, for helpful comments. The observed rainfall data were provided by the National Hydrometeorological Service of Vietnam. The NCEP/NCAR reanalysis and NOAA_OI_SST_V2 data were provided by the NOAA/OAR/ESRL PSD, Boulder, CO, USA, from their web site at http://www.esrl.noaa.gov/psd/.
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