Abstract
Evaluation of first five years of the Global Precipitation Measurement - Integrated Multi-satellitE Retrievals for GPM (IMERG) final preciptitation product was performed over Bali – Indonesia using surface observation data which derived from The Agency for Meteorology, Climatology, and Geophysics of the Republic of Indonesia (BMKG) as a reference. This study evaluated IMERG’s performance in describing the temporal characteristics of rainfall variation over various time periods (including daily, monthly, and seasonal). The analysis concentrated on the period of April 2014 to April 2019. The results of statistical measurements consisted Probability of Detection (POD), linear correction coefficient (r), Mean Bias Error (MBE), and Root Mean Square Error (RMSE). In general, the results showed that IMERG rainfall estimation value was lower than rain gauges data. The statistical assesment indicated IMERG data was highly accurate on monthly to seasonal timescales. However, a moderate correlation was shown between the daily data comparison from IMERG to ground references. IMERG Performed better in wet season period (November -April) than in dry season period (May – Oktober). The probability of detection rain events on daily time scale was good. Overall, data from IMERG has the potential to be useful as a complement to rain gauge data in areas where rainfall observations are not available in the field.
Highlights
Rainfall is the most important meteorological elements in tropical area such as Indonesia's maritime continent and it observed by observers at weather observation stations every day
Adjustments were made to the recording period of rain data between rain gauge and the Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (GPM) (IMERG) because the rainfall data from the rain gauge was noted in the measurement date
The first results of this study were obtained from the comparison of daily rain gauge data with IMERG data on a daily time scale
Summary
Rainfall is the most important meteorological elements in tropical area such as Indonesia's maritime continent and it observed by observers at weather observation stations every day. Bali island is a mountainous area and hills covering most of the center region and vast lowlands at the south and it surrounded by ocean This complex topography causes rainfall fluctuations [14]. This analysis focuses on climatological timescale in the form of seasonal, monthly, and daily. If at any time there are disruptions on land related to human error, equipment damage, and / or natural disasters, with the results of the assessment, IMERG can be considered as alternative data
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