1.3 WRF-Chem V3.9: A summary of status and updates

Ahmadov, Ravan, Georg Grell, Ka Yee Wong, Megan Bela, Li Zhang,

National Oceanic and Atmospheric Administration (NOAA)/Earth Systems Research Laboratory/Global Systems Division, and many other directly contributing authors from NOAA, the National Center for Atmospheric Research, and other institutes

In this presentation, we describe recent updates as well as ongoing work as part of the Weather Research and Forecasting (WRF) model as it is coupled with chemistry. WRF-Chem V3.9 includes new additional features such as a new photolysis scheme (new Tropospheric Ultraviolet and Visible) and a new trajectory option that monitors meteorological and chemical properties along air trajectories. In addition, in the new model the WSM6 scheme is coupled with the MOZART gas scavenging. In V3.9 all the photolysis rates, the numerous 3D diagnostic arrays used for secondary organic aerosols, convective mixing of chemicals in the KF_CUP scheme and for other purposes are packaged in registry.chem using new namelist options. This change helps to reduce the memory footprint of the WRF-Chem simulations. In this presentation a brief overview of the current status of the WRF-Chem modeling system and future developments will be discussed.