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Evaluation of Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA v7) in drought monitoring over southwest of Iran

Majid Montazeri, Mohammad Sadegh Keikhosravi Kiany*, Seyed Abolfazl Masoodian

*Corresponding author:

ABSTRACT: Characterizing the errors in satellite-based precipitation estimation for drought monitoring is of great importance as they provide both spatially and temporally complete records. The aim of this study is to evaluate the satellite-based quantitative precipitation estimates to monitor meteorological drought in the southwest of Iran. The reliability of the Tropical Rainfall Measuring Mission 3B42 and 3B43 Version 7 products in estimating the Standardized Precipitation Index (SPI) was evaluated against a ground-based gridded precipitation dataset at 0.25° spatial resolution over 1998–2016. The analysis conducted for the SPI at various time scales revealed that both 3B42 and 3B43 products are capable of capturing the spatial and temporal behavior of drought events over the study region with the best performance at the SPI6. The 3B43 is also more efficient in the identification of shorter severe drought events compared to 3B42 product. The findings suggest that both satellite products, particularly 3B43, are suitable to be used directly for SPI computation in the region for drought monitoring and early warning in terms of the accuracy and the spatial and temporal resolutions they provide.