Article
 

Low-level jets in the NASA Ames Mars general circulation model

Öffentlich Deposited

Herunterladbarer Inhalt

PDF Herunterladen
https://ir.library.oregonstate.edu/concern/articles/x059cd34w

Descriptions

Attribute NameValues
Creator
Abstract
  • Previous simulations of the Martian atmosphere have shown how topography acts to confine the low-level Hadley cell flow into intense jets on the eastern flanks of Tharsis and Syrtis Major. We now conduct detailed studies of these jets using the NASA Ames Mars general circulation model (MGCM). The structure of the flow is found to be sensitive to local topography as well as large-scale diabatic heating patters, consistent with terrestrial studies, and MGCM studies carried out with simplified topography. The summer subtropical zonal winds associated with the Hadley circulation also form spatially confined intense jet cores. Diurnal variations in heating affect jet structure in three distinct ways. Global tides interact with the jets, resulting in effects such as the two reinforcing each other at the summer subtropics near midday, leading to high winds and surface stresses at this time. Slope winds act to change the character of the jets during the course of a day, especially at Syrtis Major and the Hellas basin, where slopes are large. Vertical mixing acts to decrease low-level winds during the late afternoon. The sensitivity of the results to atmospheric dust loading is examined. We finally show how a decrease in boundary layer height due to due to dust loading actually augments mid-afternoon jet strength near the surface. The resulting increase in maximum surface stress indicates that this is a positive feedback to dust lifting.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Joshi, M.M., Haberle, J.R., Barnes, J.R., Murphy, J.R., and Schaeffer, J., 1997, Low-level jets in the NASA Ames Mars general circulation model. Journal of Geophysical Research, Vol. 102, Pg. 6511–6523.
Journal Title
Journal Volume
  • 102
Journal Issue/Number
  • E3
Academic Affiliation
Urheberrechts-Erklärung
Funding Statement (additional comments about funding)
  • This work was also supported by NASA Grant RTOP 154-20-80-16.
Publisher
Language
Replaces
ISSN
  • 0148-0227

Beziehungen

Parents:

This work has no parents.

Artikel

Miniaturansicht Titel Hochladedatum Sichtbarkeit Aktionen
file details Joshi_et_al_JGR_1997.pdf 2017-12-06 Öffentlich Herunterladen