Trends and Variabilities of Thunderstorm Days over Bangladesh on the ENSO and IOD Timescales
Abstract
:1. Introduction
2. Data and Methods
2.1. Study Area
2.2. Data Source and Quality Control
2.3. Methods
2.3.1. Mann–Kendall (MK) Trend Test
2.3.2. Weibull Probability Distribution Model
2.3.3. Spearman’s Rho Test
3. Results
3.1. Monthly and Seasonal Variation of TS Days
3.2. Annual Variation of TS Days
3.3. Spatial Distribution of TS Days
Monthly Spatial Distribution of TS Days
3.4. Spatiotemporal Pattern of TS Days
Spatial Patterns in the Monthly Trends of TS Days
3.5. Probability of TS Days over Bangladesh
3.6. The Relationship between ENSO/IOD and TS Days
4. Discussion and Conclusions
Author Contributions
Funding
Conflicts of Interest
Appendix A
Station | Mean | Median | Standard Deviation | Maximum | Minimum | 1st Quartile | 3rd Quartile | Variation per Decade |
---|---|---|---|---|---|---|---|---|
Dhaka | 6.1 | 6.1 | 1.0 | 8.8 | 4.4 | 5.3 | 6.6 | 3.3 |
Madaripur | 6.0 | 6.3 | 1.8 | 10.0 | 1.8 | 4.9 | 7.1 | 4.6 |
Faridpur | 7.1 | 7.4 | 2.0 | 11.2 | 2.2 | 5.6 | 8.5 | 5.8 |
Mymensingh | 8.2 | 8.3 | 1.6 | 11.8 | 4.1 | 7.3 | 8.9 | 5.5 |
Srimangal | 9.8 | 9.9 | 1.6 | 13.1 | 6.0 | 8.7 | 11.1 | 6.5 |
Sylhet | 11.8 | 11.9 | 1.6 | 16.2 | 9.1 | 10.5 | 12.8 | 7.5 |
Bogura | 5.7 | 5.6 | 1.3 | 8.5 | 2.9 | 4.9 | 6.8 | 2.3 |
Rajshahi | 6.3 | 6.4 | 1.2 | 9.0 | 4.4 | 5.2 | 7.2 | 3.5 |
Ishwardi | 5.5 | 5.6 | 1.4 | 8.4 | 2.8 | 4.7 | 6.3 | 2.2 |
Dinajpur | 4.6 | 4.7 | 1.7 | 7.6 | 1.0 | 3.3 | 6.0 | 3.2 |
Rangpur | 6.3 | 6.3 | 1.6 | 9.0 | 2.7 | 5.3 | 7.3 | 4.2 |
Jassore | 7.9 | 8.1 | 1.5 | 10.3 | 2.6 | 7.0 | 9.0 | 2.1 |
Khulna | 5.2 | 5.2 | 1.4 | 8.2 | 1.8 | 4.3 | 6.1 | 2.5 |
Satkhira | 5.1 | 5.5 | 1.6 | 8.5 | 1.8 | 4.1 | 6.0 | 2.3 |
Barishal | 4.9 | 5.3 | 1.6 | 7.3 | 1.7 | 3.8 | 6.3 | 3.3 |
Bhola | 4.3 | 4.2 | 1.0 | 6.4 | 2.5 | 3.6 | 5.1 | 1.1 |
Khepupara | 4.4 | 4.6 | 1.8 | 8.5 | 1.3 | 3.1 | 5.5 | 1.2 |
Patuakhali | 5.2 | 5.3 | 1.3 | 7.8 | 2.1 | 4.2 | 6.1 | 0.5 |
Chandpur | 4.3 | 4.0 | 1.3 | 7.5 | 2.5 | 3.3 | 5.1 | 3.1 |
Chattogram | 4.3 | 4.4 | 1.1 | 6.7 | 1.3 | 3.6 | 5.0 | 2.5 |
Comilla | 3.9 | 4.0 | 1.3 | 6.8 | 1.4 | 3.0 | 4.6 | 3.5 |
Cox′s Bazar | 4.2 | 4.0 | 1.0 | 6.7 | 2.4 | 3.4 | 4.9 | 2.5 |
Feni | 3.2 | 3.0 | 1.2 | 6.5 | 0.7 | 2.3 | 4.2 | 2.3 |
Hatiya | 4.8 | 4.4 | 1.7 | 8.8 | 2.0 | 3.6 | 5.7 | 1.4 |
Kutubdia | 3.1 | 3.2 | 1.2 | 5.5 | 0.7 | 2.1 | 3.8 | 1.9 |
M.court | 3.2 | 3.5 | 1.4 | 6.3 | 0.3 | 2.1 | 4.2 | 3.3 |
Rangamati | 4.5 | 4.8 | 1.5 | 7.1 | 0.6 | 3.6 | 5.5 | 1.2 |
Sandwip | 3.3 | 3.1 | 1.4 | 6.9 | 0.6 | 2.4 | 4.3 | 1.0 |
Teknaf | 2.4 | 2.5 | 1.2 | 5.2 | 0.3 | 1.4 | 3.2 | 0 |
Year | 5 | 5 | 10 | 10 | 15 | 15 | 20 | 20 |
---|---|---|---|---|---|---|---|---|
Station Name | Maximum | 3rd Quartile | Maximum | 3rd Quartile | Maximum | 3rd Quartile | Maximum | 3rd Quartile |
Dhaka | >7 | 3 | >19 | 10 | >18 | 6 | >42 | 4 |
Madaripur | >5 | 4 | >5 | 3 | >5 | 4 | >5 | 4 |
Faridpur | >10 | 8 | >12 | 9 | >15 | 9 | >17 | 8 |
Mymensingh | >22 | 16 | >26 | 12 | >28 | 12 | >26 | 20 |
Srimangal | >9 | 8 | >28 | 13 | >20 | 12 | >23 | 12 |
Sylhet | >4 | 3 | >33 | 4 | >46 | 15 | >100 | 10 |
Bogra | >13 | 12 | >14 | 12 | >16 | 14 | >18 | 13 |
Rajshahi | >8 | 2 | >26 | 7 | >13 | 6 | >15 | 6 |
Ishurdi | >14 | 8 | >14 | 10 | >16 | 10 | >18 | 12 |
Dinajpur | >7 | 5 | >9 | 5 | >8 | 5 | >8 | 6 |
Rangpur | >9 | 5 | >7 | 5 | >7 | 5 | >7 | 5 |
Jessore | >3 | 2 | >3 | 2 | >3 | 1 | >4 | 2 |
Khulna | >12 | 8 | >16 | 10 | >17 | 17 | >19 | 19 |
Satkhira | >2 | 2 | >2 | 2 | >2 | 2 | >2 | 2 |
Barisal | >3 | 3 | >4 | 2 | >5 | 3 | >4 | 2 |
Bhola | >13 | 7 | >15 | 10 | >18 | 14 | >18 | 13 |
Khepupa | >13 | 5 | >11 | 8 | >16 | 7 | >12 | 9 |
Patuakhali | >24 | 18 | >28 | 25 | >30 | 23 | >28 | 24 |
Chandpur | >3 | 2 | >6 | 5 | >8 | 5 | .>10 | 4 |
Chittagon | >11 | 7 | >17 | 6 | >15 | 6 | >8 | 5 |
Comilla | >25 | 23 | >27 | 25 | >28 | 25 | >26 | 24 |
Cox′s Bazar | >8 | 6 | >10 | 8 | >16 | 8 | >12 | 4 |
Feni | >24 | 17 | >23 | 20 | >24 | 22 | >21 | 19 |
Hatiya | >7 | 6 | >17 | 7 | >12 | 8 | >14 | 7 |
Kutubdia | >3 | 2 | >3 | 2 | >3 | 2 | >3 | 2 |
M.court | >17 | 13 | >20 | 12 | >14 | 11 | >18 | 12 |
Rangamat | >8 | 6 | >18 | 8 | >11 | 8 | >16 | 7 |
Sandwip | >6 | 4 | >14 | 5 | >6 | 3 | >12 | 5 |
Teknaf | >12 | 4 | >13 | 2 | >16 | 5 | >12 | 5 |
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Climate Modes | Years |
---|---|
El Niño | 1976, 1977, 1986, 1987, 1988, 1997, 1998, 2006, 2007, 2014 |
La Niña | 1975, 1983, 1984, 1985, 1989, 1996, 1999, 2000, 2001, 2005, 2008, 2010, 2012, 2013 |
Normal | 1978, 1991, 1992, 1994, 1995, 2002, 2003, 2004, 2005, 2009, 2015, 2016 |
IOD–positive | 1982, 1983, 1994, 1997, 2006, 2012,2015 |
IOD–negative | 1975, 1981, 1989, 1992, 1996, 1998, 2010, 2014, 2016 |
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Wahiduzzaman, M.; Islam, A.R.M.T.; Luo, J.; Shahid, S.; Uddin, M.J.; Shimul, S.M.; Sattar, M.A. Trends and Variabilities of Thunderstorm Days over Bangladesh on the ENSO and IOD Timescales. Atmosphere 2020, 11, 1176. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos11111176
Wahiduzzaman M, Islam ARMT, Luo J, Shahid S, Uddin MJ, Shimul SM, Sattar MA. Trends and Variabilities of Thunderstorm Days over Bangladesh on the ENSO and IOD Timescales. Atmosphere. 2020; 11(11):1176. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos11111176
Chicago/Turabian StyleWahiduzzaman, Md, Abu Reza Md. Towfiqul Islam, Jing–Jia Luo, Shamsuddin Shahid, Md. Jalal Uddin, Sayed Majadin Shimul, and Md Abdus Sattar. 2020. "Trends and Variabilities of Thunderstorm Days over Bangladesh on the ENSO and IOD Timescales" Atmosphere 11, no. 11: 1176. https://0-doi-org.brum.beds.ac.uk/10.3390/atmos11111176