Abstract
An analog ensemble (AE) system is developed for realization of a set of several surface meteorological variables at three stations in the Senator Beck Basin (SBB), Colorado, U.S.A and at six stations in the north-west Himalaya (NWH), India. Quality of local scale surface weather analogs in the NWH and SBB is evaluated and compared with surface meteorological observations of different characteristics, a set of different surface meteorological variables and for different periods of a year. The Pearson Correlation Coefficients (CCs) and Root Mean Square Differences (RMSDs) of the maximum value in analog days (MMX), minimum value in analog days (MNX) and analog ensemble mean (ME) of a 10-member analog ensemble system and climatological mean (CM) of each surface meteorological variable for d0 [lead time 0 h (0 h)] from its observed values on d0, d1 (24 h), d2 (48 h) and d3 (72 h) are computed. This is done to examine the predictability potential of the AE system for simultaneous prediction of a set of several surface meteorological variables at local scale (specific site). The ME of each surface meteorological variable for d0 (constant forecasts of the AE system) exhibiting reasonable values of the CCs and RMSDs for d1, d2 and d3 will imply that the AE system exhibits high predictive potential and it is worth to develop the AE system in future for multiple forecast lead times (d1, d2 and d3) not just for d0. Moreover, the predictability potential of the AE system is studied in two climatologically and geographically distinct mountainous regions to seek its generalization capacity. The percentage of observations on various surface meteorological variables appearing as a member of the AE system and rank histograms for d0 are also used to evaluate the quality of local scale surface weather analogs. The results show that the AE system exhibits high predictability potential and generalisation capacity, and it performs reasonably well for a complete year. The RMSDs of the AE system for realisation of a set of several surface meteorological variables comparable and/or even marginally higher as compared to the Root Mean Square Errors (RMSEs) for their prediction with the help of various other types of weather forecasting models over the NWH and elsewhere suggest that the AE predictive system can be a handy tool for real-time prediction of multiple surface meteorological variables at local scale with least requirement of resources (human, data, computation and time).
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Data availability statements
Surface meteorological data of the north-west Himalaya (NWH) used in this study is not publically available and it cannot be shared due to its belongingness to the sensitive areas. However, the surface meteorological data used in this study of the Senator Beck Basin (SBB) is publically available (https://snowstudies.org/csas-archival-data/).
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Acknowledgements
This study was not possible without the free data made available by the Center for Snow and Avalanche Studies, Colorado, U.S.A (https://snowstudies.org/csas-archival-data/) and the data source is acknowledged. Positive criticism, insightful comments and invaluable guidance by the anonymous reviewers helped to improve the quality of manuscript and reviewers are acknowledged. Sincere efforts of the Scientists and Technical Staff of the DGRE (formerly SASE) for collecting data in the remote locations of the North-West Himalaya (NWH), India, are acknowledged.
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Appendices
Appendix
Appendix 'A'
The Pearson Correlation Coefficients (CCs) between the AE system (MMX, MNX and ME) or CM model (CM) values for d0 and their corresponding observations on d0, d1, d2 and d3 in the test period for variables. The CCs are calculated at each station and shown using box plots for six stations in the NWH and three stations in the SBB.
Appendix 'B'
The observed temporal mean values (OB), the AE system [MMX, MNX, ME and individual analog days (ad)] or CM model temporal mean values of variables for d0 for the test period. The temporal mean values of variables are computed at each station and shown using box plots for six stations in the NWH and three stations in the SBB.
Appendix 'C'
The observed standard deviations (OB), standard deviations of the AE system [MMX, MNX, ME and individual analog days (ad)] and CM model values of variables for d0 for the test period. The standard deviations of variables are computed at each station and shown using box plots for six stations in the NWH and three stations in the SBB.
Appendix 'D'
The Root Mean Square Differences (RMSDs) of the AE system [MMX, MNX, ME and individual analog days (ad)] and CM model (CM) values of variables for d0 from their corresponding observations on d0, d1, d2, and d3 for the test period. The RMSDs are calculated at each station for every variable and shown using box plots for six stations in the NWH and three stations in the SBB.
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Singh, D., Kumar, A. Quality of Local Scale Surface Weather Analogs in Two Climatologically and Geographically Distinct Mountainous Regions. Meteorol Atmos Phys 134, 23 (2022). https://doi.org/10.1007/s00703-022-00861-1
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DOI: https://doi.org/10.1007/s00703-022-00861-1