IGPP is pleased to invite you to join its Spring 2022 Seminar Series presentation featuring new IGPP Postdoc Pawel Hordyniec. Dr. Hordyniec's talk, "Remote sensing of the Earth’s atmosphere using GNSS radio occultations" will be available via Zoom on Tuesday, May 10, 2022, starting at 12:00pm. Zoom: https://ucsd.zoom.us/j/96695736867?pwd=dmVGU0xhQ2poNHgyVWZjbk5Jclprdz09. Password: GNSS
Time: 12:00 pm, Pacific Time
Location: Munk Conference Room and Zoom
Note: This meeting will be recorded. Please make sure that you are comfortable with this before registering.
Abstract: The applicability of space geodetic techniques in the remote sensing of the atmosphere emerged from GNSS utility to provide precise information for positioning, navigation and timing purposes. In the GNSS radio occultation (RO) technique, radio signals are received by a low Earth orbiter (LEO) in a limb-sounding geometry from an occulted GNSS satellite that sets or rises above the horizon. In order to reach a receiver, the electromagnetic wave needs to pass through the Earth’s atmosphere which introduces a deviation from a straight-line propagation path and, as a consequence, a delay in signal arrival times. This time delay can be related to meteorological properties by solving the inverse problem in a spherically symmetric atmosphere. Due to the unbiased nature, high resolution and global coverage, atmospheric soundings from GNSS RO can serve as anchor observations in assimilation systems, greatly improving the forecast skill of weather prediction models. The novel concept of airborne radio occultations further expands the spatial coverage for studying tropical storms. However, in order to fully benefit from this new system, the observation operator that maps model variables into observation space is yet to be developed. In this talk, we will explain the overall concept of the GNSS RO technique as well as current scientific challenges.