講演情報
[O13-P16]Validation of a Python-based Calculation Program for JMA’s Equivalent Potential Temperature
*Kai Hanada1, Natsumi Yamamoto1 (1. Makuhari Junior and Senior High School Shibuya Kyoiku Gakuen)
This study aims to simplify the calculation of equivalent potential temperature by reformulating its calculation formula. A program was developed to compute equivalent potential temperature from upper-air observational data (temperature, pressure, and relative humidity) based on the calculation formula of Japan Meteorological Agency (2013).
When combined with precipitable water vapor (PWV), equivalent potential temperature enables the characterization of the spatiotemporal inflow of water vapor associated with precipitation phenomena such as linear precipitation bands, typhoons, and the Baiu (rainy season).
The calculation formula of the JMA was transformed using approximations, and a flowchart was developed to allow the calculation of dew point temperature, water vapor pressure, and mixing ratio from upper-air temperature, pressure, and relative humidity provided by the JMA. A program was implemented to perform automatic calculations based on the flowchart, and its consistency with the flowchart was verified.
Subsequent research will utilize large-scale reanalysis datasets to investigate frontal dynamics and regional water vapor transport.
*Equivalent potential temperature: the temperature (K) obtained by considering the latent heat released when all water vapor in an air parcel condenses and bringing it to a reference pressure (1000 hPa) through a dry adiabatic process.
*The upper-air data of the JMA consist of 26 layers from the surface to 5 hPa, and upper-air observations are conducted using radiosondes.
When combined with precipitable water vapor (PWV), equivalent potential temperature enables the characterization of the spatiotemporal inflow of water vapor associated with precipitation phenomena such as linear precipitation bands, typhoons, and the Baiu (rainy season).
The calculation formula of the JMA was transformed using approximations, and a flowchart was developed to allow the calculation of dew point temperature, water vapor pressure, and mixing ratio from upper-air temperature, pressure, and relative humidity provided by the JMA. A program was implemented to perform automatic calculations based on the flowchart, and its consistency with the flowchart was verified.
Subsequent research will utilize large-scale reanalysis datasets to investigate frontal dynamics and regional water vapor transport.
*Equivalent potential temperature: the temperature (K) obtained by considering the latent heat released when all water vapor in an air parcel condenses and bringing it to a reference pressure (1000 hPa) through a dry adiabatic process.
*The upper-air data of the JMA consist of 26 layers from the surface to 5 hPa, and upper-air observations are conducted using radiosondes.