Dear colleagues across many geoscientific disciplines, We would like to draw your attention to a broad AGU annual meeting <https://www.agu.org/annual-meeting> session focused on the use of GNSS technology for observations within Earth System Science and Geoscience disciplines. This session<https://agu.confex.com/agu/agu25/prelim.cgi/Session/251767>, while hosted by atmospheric science, is cross listed in the AGU program with natural hazards, geodesy, and atmospheric and space electricity. Please considered submitting your promising research to this session! Session Name: A013 – Advancing Earth System Science Research using Global Navigation Satellite Systems Technology Session Description: Global Navigation Satellite System (GNSS) signals have been used in geophysical research for decades due to its reliable signal sources, high precision, and capability to penetrate clouds and precipitation. As such, the expansion of commercial and government back-bone GNSS observations such as radio occultations (GNSS-RO), GNSS reflections (GNSS-R), and the expanding network of ground stations have received significant investment in past years. These various GNSS observation techniques provide high-quality globally distributed atmospheric, ionospheric, and surface retrievals useful in a wide variety of research. Other new GNSS instrumentation concepts such as polarimetric RO (PRO), LEO-LEO multi-frequency occultations, and grazing reflections can also contribute greatly to GNSS remote sensing. This session welcomes submissions including, but not limited to the following topics: 1. Utilization of GNSS remote sensing technology to improve understanding of atmospheric processes, including the planetary boundary layer and extreme weather, 2. Novel atmospheric/surface science applications, such as hydrology, altimetry, or natural hazards, as a result of GNSS remote sensing observations, 3. State-of-the-art atmospheric, surface property, and ionospheric retrieval algorithm developments, also including joint retrievals, data fusion, and machine learning/artificial intelligence, and 4. GNSS remote sensing technology advancement and novel observing concepts such as polarimetric observations, grazing reflections, next generation GNSS observing constellations, and other signals of opportunity (SoOp) remote sensing systems Abstract submissions are due July 30, 2025 at 03:59 UTC. Submit your abstracts here<https://agu.confex.com/agu/agu25/prelim.cgi/Session/251767>! See you in Washington, D.C.! Kuo-Nung Wang – NASA Jet Propulsion Laboratory Kevin J. Nelson – NASA Jet Propulsion Laboratory Ramon Padullés – Institute of Space Sciences ICE-CSIC, IEEC Zhuoyi Zhao – University of Colorado Boulder Jade Morton – University of Colorado Boulder