THE EFFECT OF DIFFERENT CONVECTION ACTIVITIES BETWEEN LAND AND SEA ON TROPOPAUSE HEIGHT VARIATIONS IN JAVA USING GNSS-RO DATA

• Main Author: Afifi, Khanifah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/65203
• Institution: Institut Teknologi Bandung

The tropopause layer is the layer between the troposphere and the stratosphere which plays a role in the process of exchanging substances such as ozone and water vapor. One of the factors that affects the height of the tropopause is convection activity. The existence of contrasting differences between diurnal convection activity in land and sea areas is allegedly influencing the variation in tropopause height. This study aims to analyze the effect of differences in convection activity between land and sea on diurnal variations in the height of the tropopause layer. The study area in this study is Java Island and the surrounding sea (6°– 9° S and 105° -115° E) with a study period from 1 December 2019 – 30 November 2020. The identification of the height of the tropopause layer is carried out using Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC-2) Global Navigation Satellite System Radio Occultation (GNSS-RO) data and Lapse Rate Tropopause (LRT) methods. Meanwhile, the convective activity was estimated using the Temperature Black Body (TBB) gradient. The results showed that the increase in convective activity over the ocean was more dominant in the late afternoon and early morning, while over land it was more dominant in the afternoon until the afternoon local time, in accordance with the increase in tropopause height. The tropopause height seasonally in ocean which is mostly in line with the cloud formation pattern, is the MAM season whereas in land area is the DJF season.