A Comprehensive Evaluation Of Satellite-Based Precipitation Products And Their Performance In Arid And Temperate Climates

الموضوعات

علوم تطبيقية وتكنولوجية

الملخص

Accurate and continuous precipitation monitoring is critical to enable effective water resources management; the challenge arises from the spatial and temporal variability of precipitation. The recently launched Global Precipitation Measurement (GPM) satellite has the capability to detect and measure all types of precipitation using advanced instruments. Being at its early stages of development, the products of the GPM IMERG (early, late, and final-run-products) need to be validated using multiple spatial and temporal assessment techniques. Several studies have emerged over the past few years evaluating GPM IMERG results over areas of limited size. These areas were set by hydrologic interest (e.g., a watershed) or administrative boundaries (e.g., a country). The research presented in this dissertation intends to surpass previous endeavors for GPM IMERG validation by performing a multi-dimensional analysis. The multidimensional analysis and evaluation were carried out across i) different climatological regions; (temperate, arid, and semiarid regions), ii) different geographical zones; (high and moderate latitudes), iii) various topographical zones; (mountainous, in-land, and coastal regions), iv) several temporal resolutions; (hourly, daily, monthly, as well as event-based), and finally v) different precipitation intensities. The performance of the satellite products was assessed based on three statistical groups: a) detection accuracy, which includes the probability of detection (POD), false alarm ratio (FAR), and the critical success index (CSI); b) error estimators which include mean absolute error (MAE), root mean squared error (RMSE), and relative bias (RB), and c) consistency measure between the satellite estimates and the corresponding rain gauge measurements using the correlation coefficient (CC). The results showed that the IMERG Final-run precipitation product had the best performance among the other near-real-time products over Arid and Temperate climates. The three products had poor detection over high latitudes, while they showed significant detection accuracy on moderate latitudes. Also, the three products showed a remarkable performance in detecting various rainfall intensities. The outcomes of this research can contribute to the continuous improvement of the IMERG algorithms. This could eventually lead to less uncertainty in the results of hydrological and climatological models relying on GPM products in poorly gauged or ungauged areas. It could also provide a good opportunity for real-time evaluation of extreme events in a particular area.

روابط وملفات

التعريف والنوع

رقم الوثيقة

fbb47246-0e25-4419-b920-66dae2c8de61

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

2325597_2.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Mohamed Mostafa Mohamed","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Mohammed Tarig Mohammed Mahmoud","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

A Comprehensive Evaluation Of Satellite-Based Precipitation Products And Their Performance In Arid And Temperate Climates

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Mohamed Mostafa Mohamed

الإعداد

Mohammed Tarig Mohammed Mahmoud

الاقتباسات الببليوغرافية