E

Accurate observation, modeling, and prediction of precipitation remain fundamental
 challenges in Earth system science and are key to sustainable management of water
 resources and disaster risk reduction. The World Climate Research Programme (WCRP) 
launched the Global Precipitation Experiment (GPEX) as a Lighthouse Activity to advance
 international collaboration in precipitation science. This session invites contributions 
that address the four primary science questions of the GPEX Science Plan: 

1. Uncertainty Reduction: Quantifying and reducing uncertainties in precipitation 
  estimates over land and ocean using advanced technologies and multi-source data
 fusion. 
2. Process Understanding: Advancing understanding of moist processes and their 
  interactions with atmospheric dynamics and other Earth system components. 
3. Model Improvement: Reducing model errors and improving parameterizations 
  and physical-AI integration. 
4. Applications and Capacity Development: Applying improved precipitation data and 
  forecasts to enhance regional resilience, early warning systems, and climate adaptation. 

Research focusing on key precipitating systems - such as atmospheric rivers, 
mesoscale convective systems, tropical cyclones, and monsoons - is especially 
welcome. This session aims to bring together observationalists, modelers, and 
application scientists to advance the understanding and predictability of 
precipitation in support of the GPEX mission.