State of the waccm report
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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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  • 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



More results from WACCM2 at 4x5

Equatorial water max. stable @ 6 ppm



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)


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


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?


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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