GPCC and GPCP precipitation products and GRACE and GRACE-FO terrestrial water storage observations for the assessment of drought recovery times

Date

2024-10-23

Author

Çakan, Çağatay

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Accurate precipitation observations are essential for understanding hydrological processes. Most precipitation products rely on station-based observations, necessitating additional independent data for validation. This study evaluates the accuracy of the Global Precipitation Climatology Center (GPCC) and Global Precipitation Climatology Project (GPCP) precipitation products by estimating hydrological drought recovery time (DRT) from terrestrial water storage anomalies (TWSA) and precipitation observations across five Köppen-Geiger climate zones. Precipitation datasets (GPCC Full Data Monthly Product v2022 and GPCP v3.2) and TWSA datasets (JPL mascon and G3P) from Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) satellite missions were used for DRT estimates. Two methods, storage deficit and required precipitation amount, were applied to calculate DRT. Results show GPCC and GPCP provide similar mean DRTs and consistencies. DRT estimations using G3P (12.1) is 2.8 months less than JPL mascon (14.9). Conversely, G3P exhibited 4.0% higher consistency than JPL mascon. The equatorial zone showed the lowest mean DRT and highest consistency, while the polar zone showed the highest mean DRT and lowest consistency. These findings offer the information required for precipitation and TWSA product accuracy by investigating hydrological drought, which aids in comprehending meteorological and hydrological processes.

Subject Keywords

GPCC, GPCP, GRACE, GRACE-FO, Drought recovery time

URI

https://hdl.handle.net/11511/112252

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Graduate School of Natural and Applied Sciences, Thesis