Dear colleagues, Are you working on a citizen science project? Do you crowdsource data to support research in the earth sciences? Are you evaluating how novel observations can ground-truth and improve remote sensing and model products? If you are working on a citizen science project on hydrology or earth sciences, please consider submitting an abstract to our session at this year's AGU Fall Meeting: H038. Citizen Science in the Hydrosphere: Engaging Community Observers and Integrating Crowdsourced Data into Remote Sensing and Modeled Products We welcome abstracts covering all facets of a citizen science project, including: project development, community engagement and recruitment, best practices for communicating results, data analysis and assimilation, and ground-truthing remote sensing and model products, among others. View the full session details here: https://agu.confex.com/agu/fm23/prelim.cgi/Session/186112 The AGU Fall Meeting is in San Francisco, California, USA on 11-15 December 2023. The Abstract submission deadline is 2 August 2023, and the early-bird registration deadline is 2 November 2023. Both in-person and online participation is welcome. Please reach out with any questions! Keith Steven Jennings, Lynker, kjennings@lynker.copm Monica M Arienzo, Desert Research Institute, monica.arienzo@dri.edu Maria Vernet, Scripps Institution of Oceanography, mvernet@ucsd.edu Christopher D Arp, University of Alaska Fairbanks, cdarp@alaska.edu