The Impact of Upper Atmosphere on Lower Atmosphere in NEMS WAM Model

The impact of upper atmosphere on lower atmosphere in NEMS WAM model

Jun Wang, Shrinivas Moorthi, Henry Juang, Mark Iredell, Miodrag Rancic EMC/NCEP Rashid Akmaev, Tim Fuller-Rowell, Fei Wu, SWPC/NOAA Craig Long, CPC/NCEP

Abstract

Whole Atmosphere Model (WAM, Akmaev et al., 2008)) has been adopted into NOAA Environmental Model System (NEMS). NEMS WAM (150 vertical layers) extends Global Forecast System (GFS) (64 vertical layers) into lower thermosphere up to 600km. The Integrated Dynamics through Earth's Atmosphere (IDEA) model for neutral atmosphere is built in NEMS GFS system to resolve the processes in upper atmosphere, operational GFS setting are accounting for processes in underneath lower atmosphere. The whole system is based on ESMF frame work with capability to couple with components such as aerosol and ocean. The NEMS WAM is expected to be implemented for operation in the next year. In this presentation we investigate the impact of upper atmosphere on lower atmosphere including troposphere and stratosphere. Integrations from the unified NEMS model have been made with (WAM) and without WAM extensions (GFS). Impact of upper atmosphere in NEMS/WAM on the vertical prorogation of planetary waves, gravity waves and tide waves will be discussed. The impact on stratosphere seasonal variability and on troposphere physics processes will be studied too.

Reference "Akmaev, R. A., T. J. Fuller-Rowell, F. Wu, J. M. Forbes, X. Zhang, A. F. Anghel, M. D. Iredell, S. Moorthi, and H.-M. Juang (2008), Tidal variability in the lower thermosphere: Comparison of Whole Atmosphere Model (WAM) simulations with observations from TIMED, Geophys. Res. Lett., 35, L03810, doi:10.1029/2007GL032584."