The JCSDA Community Radiative Transfer Model (CRTM)

The Community Radiative Transfer Model (CRTM) developed by the Joint Center for Satellite Data Assimilation (JCSDA) is an essential tool in satellite data assimilation and numerical weather prediction (NWP) systems. CRTM provides accurate radiative transfer simulations for a wide range of satellite sensors and atmospheric conditions, directly impacting the quality of satellite-based data assimilation and, consequently, weather forecasting.

This presentation will highlight recent advancements and ongoing developments in the CRTM, including updates to the visible/near-IR capabilities, surface emissivity models, and cloud and aerosol scattering routines. These enhancements, and many others, have been rigorously validated using a combination of satellite observations, in-situ measurements, and independent radiative transfer models.

We will also discuss the integration of CRTM with current operational NWP systems, focusing on improvements in computational efficiency and accuracy. Case studies demonstrating the impact of these developments on forecast skill and data assimilation performance will be presented. Additionally, we will outline future directions for CRTM development, including the incorporation of emerging satellite sensors and demonstration of new capabilities, such as space-based radar, and visible radiance reflectivities.

The CRTM remains a cornerstone in the JCSDA's mission to improve weather forecasting capabilities through the assimilation of satellite observations. This presentation aims to provide the AMS community with a comprehensive overview of the current state of CRTM and its role in advancing meteorological science, community modeling, and research-to-operations.