Abstract
Cold wave (CW) events over India are usually observed during the boreal winter months, November–February. This study proposes an objective criterion using the actual, departure from normal and the percentile values of the daily gridded minimum temperature (Tmin) data for the monitoring of the CW events over the Indian region and also checks its usefulness in a multi-model ensemble extended range prediction system. The large scale features associated with these CW events are also discussed. Utilizing this proposed criterion and considering the number of average CW days/year for the entire study period and recent decades, the CW prone region has been identified. By calculating the standardized area-averaged (over the CW prone region) Tmin anomalies time series, the CW events are identified over the period 1951–2022. Analyzing the temporal variability of these events, it is seen that there is no compromise in the occurrences of the CW events even under the general warming scenarios. It is found that the long CW events (> 7 days) are favoured by the La-Nina condition and short CW events (\(\le\) 7 days) are favoured by the neutral condition in the Pacific. Also, the blocking high to the north-west of Indian longitude with very slow movement of westerly trough to the east is found to be associated with the long CW events, whereas in case of short events the blocking high is not so significant. The multi-model ensemble prediction system is found to be reasonably skilful in predicting the CW events over the CW prone region up to 2–3 weeks in advance with decreasing confidence in longer leads. Based on the forecast verifications it is noticed that this forecasting system has a remarkable strength to provide an overall indication about the forthcoming CW events with sufficient lead time in spite of its uncertainties in space and time.
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Data availability
The IMD observation minimum temperature datasets are available at “https://www.imdpune.gov.in/Clim_Pred_LRF_New/Grided_Data_Download.html”. ERA5 reanalysis can be downloaded following https://confluence.ecmwf.int/display/CKB/How+to+download+ERA5. NCEP reanalysis is available on https://psl.noaa.gov/data/gridded/data.ncep.reanalysis.pressure.html. The ERP model datasets will be made available upon request to the corresponding author. The other products generated during this study are available from the corresponding author upon reasonable request.
Code availability
Analytical scripts and programming used in this study are available from the corresponding author upon reasonable request.
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Acknowledgements
IITM is fully supported by the Ministry of Earth Sciences, Govt. of India, New Delhi. We thank National Centre for Medium Range Weather Forecasting (NCMRWF) and Indian National Centre for Ocean Information Services (INCOIS) for providing the analysis datasets. We acknowledge NCEP for technical support on CFS model. We would like to express our sincere gratitude to India Meteorological Department (IMD) for preparing the minimum temperature observation datasets over Indian region, ECMWF and NOAA/OAR/ESRL PSL for making available the ERA5 and NCEP reanalysis. The technical support of HPC (High Performance Computing facility installed at IITM, named AADITYA) support team during the analysis is highly appreciated.
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SJ and RM conceptualized the study. RM performed the data analysis with the help of SJ and led the writing. The original manuscript is prepared by RM with the significant help of DRP, SJ and NK. The whole work is supervised by A.K.S. Contributions are made in performing the model runs by RM, AD, RP, MK and DRP. All authors contributed to the writing and interpretations of the results.
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Mandal, R., Joseph, S., Sahai, A.K. et al. Diagnostics and real-time extended range prediction of cold waves over India. Clim Dyn 61, 2051–2069 (2023). https://doi.org/10.1007/s00382-023-06666-1
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DOI: https://doi.org/10.1007/s00382-023-06666-1