Recent climatic trends and linkages to river discharge in Central Vietnam |
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| Authors: | Maxime Souvignet Patrick Laux Jim Freer Hannah Cloke Dang Quang Thinh Tran Thuc Johannes Cullmann Alexandra Nauditt Wolfgang‐Albert Flügel Harald Kunstmann Lars Ribbe |
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| Affiliation: | 1. School of Geographical Sciences, University of Bristol, Bristol, UK;2. Institute for Meteorology and Climate Research (IMK‐IFU), Karlsruhe Institute of Technology (KIT), Garmisch‐Partenkirchen, Germany;3. Dept. of Geography and Environmental Science, University of Reading, Reading, UK;4. Dept. of Meteorology, University of Reading, Reading, UK;5. Hydrology and Environment, Institute of Meteorology, Hanoi, Vietnam;6. German Federal Institute of Hydrology, IHP/HWRP Secretariat, Koblenz, Germany;7. Institute for Technology and Resources Management in the Tropics (ITT), Cologne University of Applied Sciences, K?ln, Germany;8. Institute for Geography, Geoinformatics, University of Jena, Jena, Germany;9. Institute for Geography, Regional Climate and Hydrology, University of Augsburg, Augsburg, Germany |
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| Abstract: | In this study, change in rainfall, temperature and river discharge are analysed over the last three decades in Central Vietnam. Trends and rainfall indices are evaluated using non‐parametric tests at different temporal levels. To overcome the sparse locally available network, the high resolution APHRODITE gridded dataset is used in addition to the existing rain gauges. Finally, existing linkages between discharge changes and trends in rainfall and temperature are explored. Results are indicative of an intensification of rainfall (+15%/decade), with more extreme and longer events. A significant increase in winter rainfall and a decrease in consecutive dry days provides strong evidence for a lengthening wet season in Central Vietnam. In addition, trends based on APHRODITE suggest a strong orographic signal in winter and annual trends. These results underline the local variability in the impacts of climatic change at the global scale. Consequently, it is important that change detection investigations are conducted at the local scale. A very weak signal is detected in the trend of minimum temperature (+0.2°C/decade). River discharge trends show an increase in mean discharge (31 to 35%/decade) over the last decades. Between 54 and 74% of this increase is explained by the increase in precipitation. The maximum discharge also responds significantly to precipitation changes leading to a lengthened wet season and an increase in extreme rainfall events. Such trends can be linked with a likely increase in floods in Central Vietnam, which is important for future adaptation planning and management and flood preparedness in the region. Copyright © 2012 John Wiley & Sons, Ltd. |
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| Keywords: | trend detection Mann– Kendall precipitation discharge APHRODITE Vietnam |
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