Title : Atmospheric Remote Sensing with Radio Occultation Technique and Its Science Applications
Abstract : The atmospheric limb sounding technique, which makes use of radio signals transmitted by global navigation satellite systems, such as GPS (Global Positioning Systems), has evolved as a robust global observing system. This technique, known as radio occultation (RO) can provide valuable information on water vapor, temperature and electronic density. Compared with the traditional microwave and infrared sounders, RO has many unique attributes, including high vertical resolution, high accuracy, self calibrating, no instrument drift, no satellite to satellite bias, and is minimally influenced by aerosols, clouds and precipitations. In this presentation, we will provide an overview of the RO measurement technique and its science applications, based on the results of the COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) mission. The COSMIC mission was the world’s first radio occultation satellite constellation launched in 2006 through a collaboration between the U.S. and Taiwan. Examples of the applications of COSMIC RO data to weather and climate research will be highlighted. The follow on Taiwan U.S. COSMIC II mission was launched in June 2019, and has been providing more than 5,000 GPS RO soundings per day over the tropics. With additional RO data to be provided by commercial satellite providers, this will open up additional research opportunities for the Earth System Science community.