VARIASI TAHUNAN DAN SEMI-TAHUNAN DARI PRECIPITABLE WATER VAPOR (PWV) YANG

• Main Author: Fauzan, Ahmad
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/64932
• Institution: Institut Teknologi Bandung

A deep understanding of the distribution and variation of water vapor is needed to mitigate hydrometeorological disasters, which are the disasters with the most occurrences in Indonesia. However, the Water Vapor Radiometer (WVR) and radiosonde, which are conventional technologies currently used to observe water vapor in Indonesia, have weaknesses in their spatial and temporal resolution as well as their operations. In its development GPS can also be used to observe water vapor. GPS has high spatial and temporal resolution and low operational costs in observing water vapor, but its application for meteorology in Indonesia is still very limited. In this study, the use of Precipitable Water Vapor (PWV) data derived from GPS from 237 Ina-CORS to determine the temporal variation in Indonesia. Data processing is done by harmonic analysis using MATLAB software. The results show that the PWV cycle in Indonesia is generally divided into two parts. In northern Indonesia, it is strongly dominated by semi-annual PWV cycles that occur in October and April of 52-60 mm. Meanwhile, in the southern part of Indonesia, namely the islands of Java, Papua, southern Sumatra and Sulawesi, the annual cycle that occurs in February is 56-60 mm. The annual variation of PWV in Indonesia reaches 5-15 mm and the semi-annual variation reaches 1.5-5 mm.