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The quasi 2 day wave response in TIME‐GCM nudged with NOGAPS‐ALPHA
Author(s) -
Wang Jack C.,
Chang Loren C.,
Yue Jia,
Wang Wenbin,
Siskind D. E.
Publication year - 2017
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja023745
Subject(s) - thermosphere , mesopause , mesosphere , climatology , atmospheric sciences , forcing (mathematics) , environmental science , wave model , gcm transcription factors , gravity wave , meteorology , geology , ionosphere , general circulation model , wave propagation , physics , stratosphere , geophysics , climate change , oceanography , quantum mechanics
The quasi 2 day wave (QTDW) is a traveling planetary wave that can be enhanced rapidly to large amplitudes in the mesosphere and lower thermosphere (MLT) region during the northern winter postsolstice period. In this study, we present five case studies of QTDW events during January and February 2005, 2006 and 2008–2010 by using the Thermosphere‐Ionosphere‐Mesosphere Electrodynamics‐General Circulation Model (TIME‐GCM) nudged with the Navy Operational Global Atmospheric Prediction System‐Advanced Level Physics High Altitude (NOGAPS‐ALPHA) Weather Forecast Model. With NOGAPS‐ALPHA introducing more realistic lower atmospheric forcing in TIME‐GCM, the QTDW events have successfully been reproduced in the TIME‐GCM. The nudged TIME‐GCM simulations show good agreement in zonal mean state with the NOGAPS‐ALPHA 6 h reanalysis data and the horizontal wind model below the mesopause; however, it has large discrepancies in the tropics above the mesopause. The zonal mean zonal wind in the mesosphere has sharp vertical gradients in the nudged TIME‐GCM. The results suggest that the parameterized gravity wave forcing may need to be retuned in the assimilative TIME‐GCM.