Mars Atmospheric Research Meeting in Hokkaido

1
Mars Atmospheric Research Meeting in Hokkaido

• 2005/02/28-03/02
• _at_Hokkaido Univ.

2
Participants

• Japan
• Prof. Masatsugu ODAKA
• Dr. Yoshiyuki TAKAHASHI
• Prof. Yoshiyuki HAYASHI
• Ms. Chihiro MITSUDA
• Mr. KITAMORI
• America
• Dr. Anthony Toigo
• Prof. Mark Richardson (in absentia)

3
Toigo and Richardson

• Research Goals
• and
• Collaboration Ideas

4
Research Goals

• Dust Storms
• Origin, evolution, dissipation
• Interannual variability
• Dust lifting
• Wind stress, dust devils
• Boundary Layers
• Dust lifting, dust devils, convection, turbulence
• Water Cycle
• Clouds
• Topographic clouds (volcanoes), equatorial belt
  of clouds
• Ice Caps Exchange with atmosphere regolith
• Regolith exchange
• Paleoclimate
• Past climate on Mars water content?
  Temperature? Structure of ice caps? Formation
  of polar layered terrains?
• Climate change (if different, how did we get from
  past to present?)

Toigo and Richardson
5
Research Tools

• Dust Storms
• Link global mesoscale models for full
  interaction on a variety of scales
• Dust lifting Boundary Layers
• Large eddy simulations (LES) of Martian boundary
  layer
• Water Cycle
• Mesoscale simulations of water transport (polar
  simulations, topography-influenced, etc.)
• Global model link regolith water absorption and
  ice formation models with global atmospheric
  model
• Dust Storms Water Cycle
• Combine microphysics of water ice dust (???)
• Paleoclimate
• Run GCM simulations in past conditions
• Improvements in surface models? CO2 ice
  clouds? Other new physical parameterizations?

Toigo and Richardson
6
High-resolution ( 1m) 3D LES simulations using
WRF

• Science goals
• Improve boundary layer parameterizations in
  larger scale models (mesoscale, GCM, etc.)
• Resolve dust devils
• Heat, momentum, volatile transports (compare with
  future data)
• Compare and contrast with terrestrial boundary
  layer
• Notes
• Will be undertaken, independent of collaboration
  status
• would like to include Japanese group in any way
• Interested in coordinating efforts with Japanese
  turbulence and convection models and research
• Interested in exchange of graduate students
  (America lt--gt Japan). Mr. Kitamori is invited to
  Caltech.
• Odaka-san and Takahashi-san are welcome to visit
  Caltech at any time for any length of time.

Toigo and Richardson
7
Collaboration Idea 1

• Run an LES on the Earth Simulator, but operated
  by ?? group
• Possible problems
• Foreign participation
• Principal Investigator issue?
• Failure of model to run on unique architecture
• WRF is parallelized and vectorized
• Must apply and specify model in proposal
• Depends on previous question

Toigo and Richardson
8
Global Simulations andCollaboration Ideas 2 3

• High resolution GCM by ?? group run with Earth
  Simulator
• Collaboration Idea 2
• Compare and contrast with lower resolution WRF
  GCM GFDL MGCM
• Collaboration Idea 3
• Trade physical parameterizations and use them in
  each others models
• Compare and contrast results

Toigo and Richardson
9
Paleoclimate

• Past climate conditions
• Is it warm enough for liquid water?
• What is necessary to reach that condition?
• Old Mars GCM has been run with surface pressures
  up to 1 bar
• Will be published in JGR in a month or two
• Purpose was to investigate stability of transient
  liquid water (where and when it would be stable)

Toigo and Richardson
10
Collaboration Idea 4 (vague)

• ?? Richardson ( Mischna _at_ JPL) have strong
  interest in this question
• Can they share work or ideas or results in some
  way?
• Share/trade regolith model CO2 cloud model?
• Share tools, but answer different questions (less
  work for each person)

Toigo and Richardson
11
Odaka, Takahashi and Kitamori

• Research Goals
• and
• Collaboration Ideas

12
Research Goals

• Dust storms
• Origin, evolution, dissipation
• Circulation pattern before and after dust storm
• Dust transport, dust cloud pattern
• Interaction between small and large scale
• Gravity wave and its effect on general
  circulation
• Turbulence in boundary layer
• Convection
• Effect on large scale circulation (see above)
• Gravity wave excitation by thermal convection
• Paleoclimate
• Wet and warm climate in early Mars (with ?? and
  ??)
• Circulation pattern in these climate

Odaka and Takahashi
13
Dust Storms

• GCM simulation on the Earth Simulator
• Regional to global
• Investigate dust transport and dust cloud pattern
  on those scales
• Collaboration Idea 1
• Intercomparison with each others results?
• Fundamental characteristics under simplified or
  standard conditions
• zonal wind
• Hadley circulation
• surface wind

Odaka and Takahashi
14
Scale Interaction

• GCM simulation on the Earth Simulator
• Perform simulations with several resolutions
• Coarse to fine
• Compare each result
• Collaboration Idea 2
• ?
• Now planning
• Since actual project has not been undertaken, it
  is unclear at present how collaboration might work

Odaka and Takahashi
15
Turbulence in boundary layer

• Convection dry vs. moist
• Use non-hydrostatic model
• Use relatively idealized conditions
• Gravity waves excited by thermal convection
• Large vertical extent
• Direct simulation of gravity wave breaking
• Collaboration Idea 3
• Introduce technique into WRF LES model

Odaka and Takahashi
16
Paleoclimate

• Use one-dimensional model
• Radiation model and radiative/convective model
• Energy balance model
• Use GCM or mesoscale model
• Simulation of moist convection due to CO2
  condensation
• Wide range parameter study on atmospheric surface
  pressure
• Collaboration Idea 4
• Share basic ideas about theory or numerical model

Odaka and Takahashi
17
Collaboration Ideas Compared

• Compare and contrast with lower resolution WRF
  GCM
• Share tools or methods for investigating
  paleoclimate
• Trade physical parameterizations and use them in
  each others models
• Run an LES on the Earth Simulator with ?? group

• Intercomparison of results of two GCMs (basic
  state)
• Share basic ideas about theories or models for
  paleoclimate
• Introduce turbulence and convection scheme into
  WRF
• Interaction between large and small scale

18
Summary of Discussion

• 0th continue communication and discussion
• ½th meet at conferences and show results to
  each other
• 1st Collaboration
• Run two GCMs independently and compare output
  plots
• 2nd Collaboration
• Talk about methods and theories for paleoclimate
• Early coordination will make work easier and less
  duplication
• Need to discuss with ???? and ????
• 3rd Collaboration
• Longer term talk about (trade?) physics schemes
• Needs more thought and discussion
• Purpose of trade (what is the science question)
• How much work it would take to implement?
• Usefulness (how well did it answer the above
  question)

19
Final Message from Mark Richardson

• Sorry that I couldnt make it to this meeting
• Im happy to
• have the chance to collaborate
• have real interaction that can be productive
• be working with international groups, instead of
  always being rammed together with Americans
• Excited that we share interests in modeling from
  the very largest to very smallest scales
• Thank you for inviting us and being such great
  hosts
• Next time we should meet in California, so
  Anthony and I can repay your generous kindness
• Hopefully next time we meet in Japan, I will be
  able to come as well as bring my wife
• Thank you very, very much!