Preliminary Observations of Cold-Point Tropopause Temperature, Altitude, and Pressure in 2020 over Laoag, Philippines Using Radiosonde

This study covers the 2020 tropical tropopause in the Philippines. Currently there are limited studies and would like to contribute on the exploration of tropical tropopause in the Philippines. The Cold-point tropopause (CPT) data such as altitude (CPT-A), temperature (CPT-T), and pressure (CPT-P), were retrieved from the National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Information through the Integrated Global Radiosonde Archive (IGRA). This study reveals that both the CPT-P and CPT-T, which reached their peak in August and had their lowest levels in October. This is seen in the observation of the dry, chilly season in the Philippines. The variations in CPT-A, CPT-T, and CPT-P allow for the measurement of the annual fluctuation in the temperature of the Philippines. During the year 2020, the CPT-A and CPT-T levels are both decreasing while CPT-P is increasing. The results of this study complement findings from earlier studies, which typically indicate the transition in the Philippines occur during the country's tropical season. The CPT-T rises as the rainy season approaches, and peaks in August. During the dry season, the mean CPT-T value falls, hitting a minimum in October, which corresponds with the cold dry season. The opposite relationship exists between CPT-A and CPT-P observations.