MONITORING WATER STORAGE DYNAMICS IN INDONESIAN USING GRAVITY SATELLITES GRACE AND GRACE-FO

• Main Author: Rosari, Mustika
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/73673
• Institution: Institut Teknologi Bandung

Continental water storage plays an important role in maintaining soil moisture, the Earth's water, energy, and biogeochemical cycles. Unfortunately, mapping water storage on land on a larger area scale still has low accuracy. One way to solve this problem is by using Earth's gravity data. Earth's gravity change data can be used to model water storage on land. GRACE (Gravity Recovery and Climate Experiment) and GRACE-FO (Follow-On) are gravity satellites launched in March 2002 by NASA and DLR. These satellites will produce monthly average coefficients of the Earth's gravity field expressed in spherical harmonics coefficients, Cnm and Snm. In this study, level-2 data from GRACE and GRACE-FO solutions from three providers namely (the Center for Space Research), GFZ (the GeoForschungs Zentrum), and JPL (the Jet Propulsion Laboratory) are used to model the dynamics of water storage on land expressed in equivalent water height (EWH). The data used is data with a data range from 2002 to 2020. However, unfortunately in the data used, the coefficient spherical harmonics are still affected by several errors, causing the resulting EWH to still contain noise and error. Therefore, improvement is needed by using the best filtering method without removing the signal in the modelled EWH. Afterward, the resulting model will be subjected to time series analysis to characterize the dynamics of water storage in the Indonesian region.