Inter comparison and accuracy assessment of TRMM 3B42 products over Turkey

Amjad, Muhammad
Yılmaz, Mustafa Tuğrul
Accurate estimation of precipitation, especially over complex topography, is impeded by many factors depending on the platform that it is acquired. Satellites have the advantage of providing spatially and temporally continuous and consistent datasets. However, utilizing satellite precipitation data in various applications requires its uncertainty estimation to be carried out robustly. In this study, accuracy of two Tropical Rainfall Measurement Mission (Version 3B42) products, TRMM 3B42 V6 and TRMM3B42 V7, are assessed for their accuracy by inter-comparing their monthly time series against ground observations obtained over 256 stations in Turkey. Errors are further analyzed for their seasonal and climate-dependent variability. Both V6 and V7 products show better performance during summers than winters. V6 product has dry bias over drier regions and V7 product has wet bias over wetter regions of the country. Moreover, rainfall measuring accuracies of both versions are much lower along coastal regions and at lower altitudes. Overall, the statistics of the monthly products confirm V7 product is an improved version compared to V6.


Performance evaluation of satellite- and model-based precipitation products over varying climate and complex topography
Amjad, Muhammad; Yılmaz, Mustafa Tuğrul; Yücel, İsmail; Yılmaz, Koray Kamil (Elsevier BV, 2020-05-01)
Accuracy assessment of precipitation retrievals is a pre-requisite for many hydrological studies as it helps to understand the source and the magnitude of the uncertainty in hydrological response variables, particularly over regions with complex topography. This study evaluates GPM IMERGv05, TMPA 3B42V7, ERA-Interim, and ERA5 precipitation products using 256 ground-based gauge stations between 2014 and 2018 over Turkey known to have complex topography and varying climate. Error statistics, categorical perfo...
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In seismically active regions strong ground motion estimation is essential for several purposes ranging from seismic design and analyses to disaster management. In regions of sparse seismic networks or seismic activity with long return periods, simulations become essential. This is particularly true when not only the peak ground motion parameters but the full time series of acceleration is required for earthquake engineering purposes. These simulations provide not only the earthquake engineering parameters ...
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Bridge scour is an extremely complex phenomenon because of the random characteristics of sediment laden flow in close proximity to piers and abutments. This occurrence leads to high uncertainties and unavoidable risk in bridge pier and abutment design. In this study, a composite reliability model is developed for the reliability assessment of bridge pier scour using static resistance - loading interference. Based on the physical interpretation of the phenomenon and a statistical analysis of the available in...
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Soil moisture condition of a watershed plays a significant role in separation of rainfall into infiltration and surface runoff, and hence is a key parameter for the majority of physical hydrological models. Due to the large difference in dielectric constants of dry soil and water, microwave remote sensing and particularly the commonly available synthetic aperture radar is a potential tool for such studies. The main aim of this study is to produce the distributed soil moisture maps of a catchment from active...
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In the probabilistic seismic hazard analysis, the past earthquake records that can not be associated with any one of the specific faults are treated as background seismic activity. Contribution of background seismic activity to seismic hazard is generally calculated by using two different models, namely: background area source with uniform seismicity and spatially smoothed seismicity model. In this study, two case studies are carried out for a large (a country) and a small region (a province) in order to in...
Citation Formats
M. Amjad and M. T. Yılmaz, “Inter comparison and accuracy assessment of TRMM 3B42 products over Turkey,” presented at the EGU General Assembly 2016, Vienna, Austria, 2016, Accessed: 00, 2021. [Online]. Available: