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Spatio-temporal evaluation of event detection and measurement coherence among satellite rainfall products for ensembled dataset generation

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Abstract

Selection of a best suited satellite-based gridded rainfall product (SGRP) is challenging due to their significant variations at spatial and temporal scale. The present study comprehensively evaluated the SGRPs (Climate Hazards Group Infrared Precipitation with Stations (CHIRPS), Tropical Rainfall Measuring Mission (TRMM), Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks (PERSIANN), and SM2RAIN algorithm-based product) at daily scale for the period 1998–2013, with reference to gauge-based gridded rainfall product generated by Indian Meteorological Department (IMD) over the Mahanadi river basin in eastern India. Spatio-temporal evaluation of SGRPs was carried out intra-seasonally using both descriptive (event detection) and value-based approaches (coherence in measurement values). Studies that require accurate representation of rainfall event occurrence (descriptive parameter approach) results indicated that TRMM, CHIRPS, SM2RAIN, and CHIRPS gridded datasets performed better during winter, pre-monsoon, south-west monsoon, and north-east monsoon, respectively. On the contrary, studies that require precise measurements of rainfall values on a daily scale (value-based parameter approach) indicated that CHIRPS (during winter and pre-monsoon) and SM2RAIN (during south-west monsoon and north-east monsoon) may be used. Further, best performing rainfall products at seasonal scale were identified through ensembling approach. CHIRPS datasets prominently identified rainfall events across the study region during the winter, pre-monsoon, and the north-east monsoon periods. However, during the southwest monsoon period, SM2RAIN gridded dataset best represented the rainfall pattern of the study region. An ensembled gridded precipitation product is also generated incorporating the grid-level performance of various SRGPs.

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Data availability

Data analyzed in this study were a combination of (a) reanalysis of existing datasets (TRMM, CHIRPS,SM2RAIN, and PERSIANN), which are openly available at locations cited in the reference section, and (b) IMD datasets, which is subject to confidentiality agreements, where supporting data can only be made available to bona fide researchers subject to a non-disclosure agreement.

Code availability

The code for analyzing and processing the datasets may be provided upon reasonable request and discretion of authors.

References

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Acknowledgements

The authors are grateful to Dr. Raj Kumar, Director, NRSC, for the support and suggestions during the execution of the study. The authors are very much thankful to various agencies for providing the rainfall gridded products in the open-source domain necessary for this study. Authors sincerely appreciate the anonymous reviewers, Editor, and Associate Editor for the critical review that has significantly improved the quality of manuscript.

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Authors and Affiliations

Authors

Contributions

NRSR: methodology, software, validation, formal analysis, investigation, resources, data curation, writing—original draft, writing—review and editing, visualization; VMC: conceptualization, methodology, investigation, resources, writing—review and editing, supervision, project administration; VVR: resources, supervision, editing, project administration; CSJ: resources, supervision, editing, project administration.

Corresponding author

Correspondence to V. M. Chowdary.

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Not applicable. This study and the reported results do not involve humans and/or animals and the scope of work does not fall under life sciences.

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Not applicable. This study and the reported results do not involve humans and/or animals and the scope of work does not fall under life sciences.

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The authors declare no competing interests.

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NR, S., Chowdary, V.M., Vala, V.R. et al. Spatio-temporal evaluation of event detection and measurement coherence among satellite rainfall products for ensembled dataset generation. Theor Appl Climatol 148, 1477–1497 (2022). https://doi.org/10.1007/s00704-022-04002-x

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  • DOI: https://doi.org/10.1007/s00704-022-04002-x

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