Land and Climate Seminar - Water vapor variability and trends from GNSS

Speaker: Anna Klos

Global Navigation Satellite System (GNSS) is currently a recognized system for observing the atmosphere. It allows for accurate estimation of water vapor content, which accounts for 60–70% of atmospheric warming. The water vapor content in the atmosphere is characterized by high spatial and temporal variability, which makes its prediction extremely difficult. It is therefore underestimated in numerical weather prediction models and climate models. The use of observations of water vapor content in the atmosphere obtained from ultra-dense networks of GNSS ground stations is crucial for weather forecasting and climate monitoring. This presentation will discuss issues related to the reliable determination of water vapor content from GNSS observations, their correct interpretation, and their use in monitoring climate change.