Journal
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
Volume 23, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ejrh.2019.100599
Keywords
PMP; Clausius clapeyron; RCP; GCM; Northeast Vietnam
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Funding
- Vietnamese Government scholarship (project 911)
- Social Implementation Program on Climate Change Adaptation Technology (SI-CAT) of MEXT, Japan
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Study region: In this study, three provinces in Northeast Vietnam including Bac Kan, Thai Nguyen, and Tuyen Quang are examined to determine the precipitation variation characteristics. Study focus: The average yearly temperature during the last two decades in Northeast Vietnam has increased by 0.72 degrees C when compared to the period 1962-1990. The Clausius Clapeyron (CC) relation indicates that a warmer atmosphere can result in higher moisture-holding capacity; hence, there is the possibility of increased extreme rainfall with respect to the rise in temperature. We evaluate the relationship between the average 24-hour temperature and rainfall extremes using the binning method. The estimation of the 24-hour probable maximum precipitation (PMP) is then implemented based on the moisture maximization and Hershfield statistical methods. New hydrological insights for the region: The 99.9th percentiles of 24-hour precipitation are close to the super CC scaling up to peak points of 22.6-25.6 degrees C and decrease at higher temperatures. The Hershfield method produces 24-hour PMP results ranging from 232 mm to 895 mm. PMP outputs using the moisture maximization method based on the 100-year dew point are higher than those results generated from the statistical method except for Chiem Hoa station. Considering possible changes in future relative humidity under a warming climate from GCMs and RCM projections for two RCP scenarios, RCP 8.5 indicates the possible rise in probable extreme precipitation.
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