Analysis of trends and variability in frequency and intensity indices of precipitation over Myanmar during 1985-2020
DOI:
https://doi.org/10.58712/ie.v2i1.33Keywords:
precipitation, RClimDex, extreme indices, rainfallAbstract
In this study, an analysis of long-term extreme precipitation indices was conducted using daily observation data from 38 stations in Myanmar spanning from 1985 to 2020. Three frequency indices and six intensity indices of precipitation were analyzed using RClimDex software. The Mann-Kendall test, along with Sen’s slope method, was employed to determine the trends and magnitude of extreme indices. The spatial distribution patterns varied across different physiographic regions, with 63% to 76% of the stations displaying increasing trends in various indices. The consecutive dry days showed increasing trends in the hilly regions, whereas the consecutive wet days exhibited decreasing trends in those areas. For the maximum 1-day precipitation, 45% of stations displayed increasing trends, with 5% of those being statistically significant. The Western Hilly Region exhibited rising trends in extremely wet days, whereas other regions have experienced mixed trends. These findings highlight the need for adaptive water resources engineering and management to address the localized changes of precipitation trends that affect floods and droughts in Myanmar.
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References
S. Subba, Y. Ma, and W. Ma, “Spatial and Temporal Analysis of Precipitation Extremities of Eastern Nepal in the Last Two Decades (1997–2016),” Journal of Geophysical Research: Atmospheres, vol. 124, no. 14, pp. 7523–7539, Jul. 2019, https://doi.org/10.1029/2019JD030639
I. Bouizrou, M. Aqnouy, and A. Bouadila, “Spatio-temporal analysis of trends and variability in precipitation across Morocco: Comparative analysis of recent and old non-parametric methods,” Journal of African Earth Sciences, vol. 196, p. 104691, Dec. 2022, https://doi.org/10.1016/j.jafrearsci.2022.104691
Z. M. M. Sein et al., “Recent variability of sub?seasonal monsoon precipitation and its potential drivers in Myanmar using in?situ observation during 1981–2020,” International Journal of Climatology, vol. 42, no. 6, pp. 3341–3359, May 2022, https://doi.org/10.1002/joc.7419
M. H. I. Dore, “Climate change and changes in global precipitation patterns: What do we know?,” Environ Int, vol. 31, no. 8, pp. 1167–1181, Oct. 2005, https://doi.org/10.1016/j.envint.2005.03.004
W. Win Zin and M. Rutten, “Long-term Changes in Annual Precipitation and Monsoon Seasonal Characteristics in Myanmar,” Hydrology: Current Research, vol. 08, no. 02, 2017, https://doi.org/10.4172/2157-7587.1000271
R. Horton et al., “Assessing Climate Risk in Myanmar,” New York, 2016. [Online]. Available: https://unhabitat.org/sites/default/files/2019/10/assessing-climate-risk-in-myanmar_technical-report.pdf
M. Shrestha, S. Shrestha, and A. Datta, “Assessment of Climate Change Impact on Water Diversion from the Bago River to the Moeyingyi Wetland, Myanmar,” Curr Sci, vol. 112, no. 02, p. 377, Jan. 2017, https://doi.org/10.18520/cs/v112/i02/377-384
The Republic of the Union of Myanmar, Myanmar Climate Change Strategy (2018 – 2030). 2019. [Online]. Available: https://myanmar.un.org/sites/default/files/2019-11/MyanmarClimateChangeStrategy_2019.pdf
U. Ghimire, T. Piman, M. Shrestha, A. Aryal, and C. Krittasudthacheewa, “Assessment of Climate Change Impacts on the Water, Food, and Energy Sectors in Sittaung River Basin, Myanmar,” Water (Basel), vol. 14, no. 21, p. 3434, Oct. 2022, https://doi.org/10.3390/w14213434
L. Adil, D. Eckstein, V. Kunzel, and L. Schafer, “Climate Risk Index 2025: Who suffers most from extreme weather events?,” Bonn, 2025. [Online]. Available: https://www.germanwatch.org/sites/default/files/2025-02/Climate%20Risk%20Index%202025.pdf
Z. M. Mie Sein, I. Ullah, F. Saleem, X. Zhi, S. Syed, and K. Azam, “Interdecadal Variability in Myanmar Rainfall in the Monsoon Season (May–October) Using Eigen Methods,” Water (Basel), vol. 13, no. 5, p. 729, Mar. 2021, https://doi.org/10.3390/w13050729
A. Hussain et al., “Observed trends and variability of seasonal and annual precipitation in Pakistan during 1960–2016,” International Journal of Climatology, vol. 42, no. 16, pp. 8313–8332, Dec. 2022, https://doi.org/10.1002/joc.7709
M. J. Manton et al., “Trends in extreme daily rainfall and temperature in Southeast Asia and the South Pacific: 1961–1998,” International Journal of Climatology, vol. 21, no. 3, pp. 269–284, Mar. 2001, https://doi.org/10.1002/joc.610
J. Caesar et al., “Changes in temperature and precipitation extremes over the Indo?Pacific region from 1971 to 2005,” International Journal of Climatology, vol. 31, no. 6, pp. 791–801, May 2011, https://doi.org/10.1002/joc.2118
M. Yazid and U. Humphries, “Regional Observed Trends in Daily Rainfall Indices of Extremes over the Indochina Peninsula from 1960 to 2007,” Climate, vol. 3, no. 1, pp. 168–192, Feb. 2015, https://doi.org/10.3390/cli3010168
K. K. Sein, A. Chidthaisong, and K. L. Oo, “Observed Trends and Changes in Temperature and Precipitation Extreme Indices over Myanmar,” Atmosphere (Basel), vol. 9, no. 12, p. 477, Dec. 2018, https://doi.org/10.3390/atmos9120477
L. L. Aung et al., “Myanmar Climate Report,” 2017. [Online]. Available: https://www.burmalibrary.org/sites/burmalibrary.org/files/obl/2017-09-14-Myanmar-Climate-Report-en-red.pdf
T. Salmi, A. Maatta, P. Anttila, T. Ruoho-Airola, and T. Amnell, “Detecting Trends of Annual Values of Atmospheric Pollutants by the Mann-Kendall Test and Sen’s Slope Estimates—The Excel Template Application MAKESENS,” Helsinki, 2002.
T. Soe and K. M. Ma, “The geography of the Chindwin River Basin ,” in ChindwinFuturesNatural resources, livelihoods, institutions andclimate change in Myanmar’s Chindwin River Basin, Selangor: Strategic Information and Research Development Centre, 2021. [Online]. Available: https://www.sei.org/wp-content/uploads/2021/09/chindwin-futures-e-book-small-size-for-download-sept-2021.pdf
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Copyright (c) 2025 Min Khaing, Win Win Zin, Zin Mar Lar Tin San, Soe Thiha, Manish Shrestha
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