1 / 15

The Mars General Circulation Modeling Group

The Mars General Circulation Modeling Group. Alison F.C. Bridger SJSU. The Mars General Circulation Modeling Group. Our fearless leader is Dr. Bob Haberle of NASA-Ames; SJSU graduate. URL: http://www-mgcm.arc.nasa.gov/MGCM.html. The NASA-Ames MGCM. Origin of the model

arne
Download Presentation

The Mars General Circulation Modeling Group

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Mars General Circulation Modeling Group Alison F.C. Bridger SJSU MGCM & group: AFCB, Sept 2007 @ SJSU

  2. The Mars General Circulation Modeling Group Our fearless leader is Dr. Bob Haberle of NASA-Ames; SJSU graduate. URL: http://www-mgcm.arc.nasa.gov/MGCM.html MGCM & group: AFCB, Sept 2007 @ SJSU

  3. The NASA-Ames MGCM • Origin of the model • Derived originally from the UCLA model (Mintz, Arakawa) • Adapted to Mars originally by Leovy • Adaptations include… • Planetary constants (easy) • Radiation (not so easy!) • Other (some still being determined) MGCM & group: AFCB, Sept 2007 @ SJSU

  4. The NASA-Ames MGCM • Model details • Finite difference (hydrostatic) • Roughly 0-80 km • Physics in the model • Shortwave heating – absorption by CO2 and dust • Solar heating of the ground • Sensible heat flux back up to the atmosphere • Heat conduction into/out of the regolith (soil model) • Melting of CO2 ice; effects of sub-surface ice MGCM & group: AFCB, Sept 2007 @ SJSU

  5. The NASA-Ames MGCM • Physics in the model ctd. • Longwave heating/cooling (CO2) • Dust in the atmosphere • User-specified? Internally determined? • Observed spatial versus depth distributions • Dust particle properties (mineral, size, shape) • Radiative effects MGCM & group: AFCB, Sept 2007 @ SJSU

  6. The NASA-Ames MGCM • Physics in the model ctd. • Water (vapor, ice) in the atmosphere • Water (ice) clouds & fog • CO2 ice clouds • CO2 deposition onto/sublimation from the ice caps & the CO2 annual cycle MGCM & group: AFCB, Sept 2007 @ SJSU

  7. The NASA-Ames MGCM • Ongoing developments at NASA-Ames (led by Bob Haberle) • New dynamical “core” added in the last two years (GFDL) • allows multiple tracers, including water and dust • Soon to be replaced with a new core/grid structure MGCM & group: AFCB, Sept 2007 @ SJSU

  8. The NASA-Ames MGCM • Ongoing developments • New radiation code • More powerful and sophisticated • More “expensive”! • Allows radiative effects of water ice, CO2 ice, & dust to be incorporated and explored MGCM & group: AFCB, Sept 2007 @ SJSU

  9. The NASA-Ames MGCM • Ongoing developments • Ground ice…soil model • Clouds (CO2, water) • Aerosol/dust MGCM & group: AFCB, Sept 2007 @ SJSU

  10. Applications • Mission support • Planning for conditions (densities) in the upper atmosphere during aerobraking activities • Planning for conditions during descent • Planning for conditions on the surface MGCM & group: AFCB, Sept 2007 @ SJSU

  11. Applications • Interpretation of observations • E.g., MGS densities (Kelvin waves) • Streaks on the surface (wind scouring, prevailing wind directions) • Baroclinic wave activity! • Cloud observations! MGCM & group: AFCB, Sept 2007 @ SJSU

  12. Applications • “Paleoclimate” • A “warm, wet” early Mars, or not? • Present-day climate • Climate change? • Viking versus MGS • “swiss cheese” observations MGCM & group: AFCB, Sept 2007 @ SJSU

  13. Some of my recent work… • Simulations of the “MGS year 2” global dust storm • Goal = successful self-contained simulation of the storm • Now … still specifying dust distributions & history • Simulated temperatures compare well with MGS-TES observations • Use the model to suggest ways the storm might have expanded MGCM & group: AFCB, Sept 2007 @ SJSU

  14. Results… MGCM & group: AFCB, Sept 2007 @ SJSU

  15. Results… MGCM & group: AFCB, Sept 2007 @ SJSU

More Related