Abstract
The accurate predictions of extreme precipitation/snowfall events are very helpful in identifying the severe avalanche/landslide prone hazard areas in advance over high mountainous regions. The Weather Research and Forecasting model (WRF) version 3.9 has been used to investigate the performance of Four-Dimensional Variational data assimilation (4D-Var) on Three-Dimensional Variational data assimilation (3D-Var) by considering two extreme snowfall events (23–26 January 2017 and 05–08 February 2019) over the Western Himalaya (WH). The result shows that the 4D-Var performed better than the 3D-Var for both the events by analyzing domain-averaged error and sensitivity parameter analysis. The initial state model variable’s domain-averaged error analysis revealed that 4D-Var has great potential to improve the initial conditions than the 3D-Var from lower to the upper atmosphere. Sensitivity parameter analysis also supports 4D-Var has more sensitive than the 3D-var especially in the lower and upper atmosphere by changing temperature and moisture fields along with winds circulations. From statistical skill scores analysis, 4D-Var performed well to reproduce the extreme snowfall events than the 3D-Var over WH.
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Acknowledgments
Authors are thankful to Director, SASE for providing full support and NCAR for using the WRF model. The authors would also like to acknowledge the NCEP GFS 0.25 Degree Global Forecast data used here as the initial and boundary conditions for the model archived from the Research Data Archive (RDA), National Center for Atmospheric Research (NCAR). NCAR is sponsored by the National Science Foundation (NSF), USA. TRMM and GPM used in this study are produced with the Giovanni online data system, developed and maintained by the NASA GES DISC.
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Appendices
Appendix −1
1.1 Contingency Table (2 X 2)
Observed | ||||
---|---|---|---|---|
Forecasted | Yes | No | ||
Yes | Hits (a) | False Alarm (b) | (a + b) Forecasted Yes | |
No | Misses (c) | Correct negatives (d) | (c + d) Forecasted No | |
(a + c) Observed Yes | (b + d) Observed No | Total (N) |
Statistical Scores.
1. Accuracy (Acc)
Acc = \( \frac{a+d}{N}=\frac{Correct\ Forect}{Total\ Events.} \)
Range: 0 to 1. Perfect score: 1.
2. Bias Score (Bias) =\( \frac{a+b}{a+c}=\frac{Forecasted\ events}{Observed\ Events} \)
Range: B = 1 Unbiased, B > 1 under Forecast, B < 1 Over Forecast
3. Probability of Detection (POD)
\( \left( POD=\right)\frac{a}{a+c}=\frac{Hits}{Observed\kern0.5em Events\kern0.5em \left(\mathrm{yes}\right)} \)
Range: 0 to 1. Perfect score: 1.
4. False Alarm Ratio (FAR)
\( \left( FAR=\right)\frac{b}{a+b}=\frac{False\kern0.5em Alarm}{Forecasted\kern0.5em Events\kern0.5em \left(\mathrm{yes}\right)} \)
Range: 0 to 1. Perfect score: 0.
5. Equitable Threat Score (Gilbert Skill Score; ETS)
hits_random = HR = \( \frac{\left(a+c\right)\left(a+b\right)}{N} \)
ETS = \( \frac{a- HR}{\left(\left(a+b+c\right)- HR\right)} \)
Range: −1/3 to 1, 0 indicates no skill. Perfect score: 1.
6. Heidke Skill Score (HSS)
\( \left( HSS=\right)\frac{2\ast \Big(\left(a\ast \mathrm{d}\right)-\left(\mathrm{b}\ast \mathrm{c}\right)}{\left(\left(a+c\right)\ast \left(\mathrm{a}+\mathrm{b}\right)\ast \left(\mathrm{b}+\mathrm{d}\right)\right)} \)
Range: −1 to 1, 0 indicates no skill. Perfect score: 1.
7. Mean Absolute Error (MAE)
\( \left( MAE=\right)\frac{1}{N}{\sum}_{i=1}^N\mid {F}_i-{O}_i\mid \)
8. Root Mean Square Error (RMSE)
\( \left( RMSE=\right)\sqrt{\frac{1}{N}{\sum}_{i=1}^N{\left({\mathrm{F}}_{\mathrm{i}}-{\mathrm{O}}_{\mathrm{i}}\right)}^2} \)
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Nalamasu, N., Shekhar, M.S. & Singh, G. Performance of 4D-Var Data Assimilation on Extreme Snowfall Forecasts over the Western Himalaya Using WRF Model. Asia-Pacific J Atmos Sci 57, 555–571 (2021). https://doi.org/10.1007/s13143-020-00216-z
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DOI: https://doi.org/10.1007/s13143-020-00216-z