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State of the WACCM Report

State of the WACCM Report. Current status of WACCM WACCM1b frozen and accessible on the web https://dataportal.ucar.edu Model code and documentation Selected datasets Interactive WACCM work in progress WACCM2: based on CAM2, produces acceptable climatology at 2x2.5 and 4x5

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State of the WACCM Report

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  1. State of the WACCM Report

  2. Current status of WACCM • WACCM1b frozen and accessible on the web • https://dataportal.ucar.edu • Model code and documentation • Selected datasets • Interactive WACCM work in progress • WACCM2: based on CAM2, produces acceptable climatology at 2x2.5 and 4x5 • WACCM2 + solar variability modules (aurora, ion chemistry, extreme EUV sw heating, ion drag, and Joule heating): currently being tested • WACCM3: based on CAM3, reproduces results of WACCM2, at 4x5 • Once solar modules are tested in WACCM2, will implement them in WACCM3

  3. Some results from WACCM2 at 4x5

  4. More results from WACCM2 at 4x5 Equatorial water max. stable @ 6 ppm

  5. WACCM2/WACCM3 (4x5) Comparison WACCM3 WACCM2

  6. Major science projects planned • GHG + CFC trend run: 1975-present: a repeat of the work done with WACM1b + MZ3, using interactive model; evaluate observed trends in O3, H2O, T, etc. • Response to the 11-year solar cycle: can 11-year variability documented in observations be reproduced with a comprehensive, interactive model? • Other collaborative projects, with LASP (to be described by DK)

  7. Model development strategy • Both NCAR projects (GHG, solar cycle) require an interactive model; several collaborative projects with LASP projects do as well • Should we use WACCM2 (interactive WACCM based on CAM2) or WACCM3 (interactive, based on CAM3)? • Success with WACCM3 suggests that this be the model of choice • Depending on progress in testing the solar variability modules, it may be desirable to wait until these are incorporated in WACCM3 before undertaking the GHG and solar cycle experiments • Other work can proceed immediately using either WACCM2 or WACCM3, without solar variability modules

  8. Papers in preparation (NCAR group) • Trends in temperature and atmospheric constituents, 1979-2000 [WACCM1b] • The 2-day wave: model calculations with WACCM and comparison with TIMED/SABER data [WACCM1b] • High-frequency, planetary-scale motions in the MLT simulated by WACCM [WACCM1b] • Effects of interactive ozone chemistry on simulations of the middle atmosphere [WACCM2] • Others?

  9. Today’s Agenda • Doug Kinnison (15 min) • Climatology of 2x2.5 WACCM2 • Comparison with satellite occultation data (collaboration with LASP) • Other collaborative work in progress • Dehydration/denitrification updates for WACCM2 • Yaga Beres (15 min) • Specification of mesoscale convective gw spectrum in WACCM2 • Andrew Gettelman (15 min) • Supersaturation experiments with WACCM2 • Dehydration near the summer mesopause • Dan Marsh (15 min) • Solar variability modules for WACCM3 • Mijeong Park (15 min) • Monsoon region UTLS study • General discussion, as needed (30 min)

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