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Long-term trend analysis of observed gridded precipitation and temperature data over Munneru River basin, India

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Abstract

Long-term trend analysis of meteorological variables is required for implementing any hydrological model or water resources management model to a basin. Spatio-temporal variations in precipitation and temperature of a basin are helpful for meteorologists, agriculturists and policymakers to take appropriate decisions. This study performs long-term trend analysis for gridded precipitation (1901–2019) and temperature (1951–2019) datasets of 0.25º × 0.25º resolution in the Munneru river basin, India using five different trend tests for annual, seasonal and monthly time steps in sub-basin wise. An increasing trend is observed in annual precipitation in the first sub-basin (S1) at 8.6 mm/decade and in the third sub-basin (S3) at 11.6 mm/decade. An increasing trend is observed for both annual average maximum and minimum temperature at a rate of 1.5ºC and 0.06ºC per decade for the basin, respectively. Twenty different climate extreme indices are calculated using daily data of precipitation and temperature. Increasing trend is observed for PCPTOT, R20mm, RX5DAY, R95PTOT, SDII, TX90P, TXX and WSDI indices. Decreasing trend is observed for CWD, CSDI, TN10P and TX10P at particular grid points. Results from this study are useful to understand the climate variability and its impact on water resources in the future periods and hydrological assessment in the basin.

Research Highlights

  • In this study detailed long-term trend analysis was carried out for precipitation and temperature using four different trend tests and ITA was used to check, whether the trend is monotonic or non-monotonic.

  • The increasing trends in precipitation and climate extremes in this region require careful extension of this study into evaluation of extreme hydrologic–hydraulic flow regimes.

  • Results from this study are used to address the cropping pattern, irrigation, water supply and demand-related issues in this basin.

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Acknowledgements

Authors sincerely thank India Meteorological Department (IMD) for sharing the observed meteorological data and the National Remote Sensing Center (NRSC) for LULC map of the study area. This work is funded by the Department of Science and Technology (DST), Government of India, under BRICS – DST project with Grant No: DST/IMRCD/BRICS/PilotCall2/IWMM-BIS/2018 (G).

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Eswar Sai Buri: Data curation, formal analysis, investigation, methodology, software, visualization, writing – original draft, review and editing. K Venkata Reddy: Conceptualization, data curation, funding acquisition, investigation, methodology, project administration, resources, software, validation, visualization, writing – original draft, review and editing. K N Loukika: Data curation, formal analysis, investigation, methodology, software, visualization, writing – original draft, review and editing.

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Correspondence to Eswar Sai Buri.

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Communicated by T Narayana Rao

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Buri, E.S., Keesara, V.R. & Loukika, K.N. Long-term trend analysis of observed gridded precipitation and temperature data over Munneru River basin, India. J Earth Syst Sci 131, 115 (2022). https://doi.org/10.1007/s12040-022-01864-7

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  • DOI: https://doi.org/10.1007/s12040-022-01864-7

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