CO<sub>2</sub> ice clouds in the upper atmosphere of Mars

Clancy, R. T.; Sandor, Brad J.

doi:10.1029/98gl00114

Cited by 74 publications

(68 citation statements)

References 14 publications

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“…However, our experience with the present model has also shown that the thermal and dynamic structure above 50 km is difficult to predict. First, it must be stated here that the averaged temperatures obtained by the model in this region seem slightly too warm compared to the few observations obtained in situ by spacecrafts [see Lewis et al, this issue] or by Earth-based instruments [Clancy and Sandor, 1998]. Also, we have found that very different results can be obtained when using a spectral dynamical core compared to a grid point model.…”

Section: Resultscontrasting

confidence: 44%

Improved general circulation models of the Martian atmosphere from the surface to above 80 km

Forget¹,

Hourdin²,

Fournier³

et al. 1999

J. Geophys. Res.

1,058

1,109

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Abstract. We describe a set of two "new generation" general circulation models of the Martian atmosphere derived from the models we originally developed in the early 1990s. The two new models share the same physical parameterizations but use two complementary numerical methods to solve the atmospheric dynamic equations. The vertical resolution near the surface has been refined, and the vertical domain has been extended to above 80 km.These changes are accompanied by the inclusion of state-of-the-art parameterizations to better simulate the dynamical and physical processes nero' the surface (boundary layer scheme, subgrid-scale topography parameterization, etc.) and at high altitude (gravity wave drag). In addition, radiative transfer calculations and the representation of polar processes have been significantly improved. We present some examples of zonal-mean fields from simulations using the model at several seasons. One relatively novel aspect, previously introduced by Wilson [1997], is that around northern winter solstice the strong pole to pole diabatic forcing creates a quasi-global, angular-momentum conserving Hadley cell which has no terrestrial equivalent. Within such a cell the Coriolis forces accelerate the winter meridional flow toward the pole and induce a strong warming of the middle polar atmosphere down to 25 km. This winter polar warming had been observed but not properly modeled until recently. In fact, thermal inversions are generally predicted above one, and often both, poles m'ound 60-70 km. However, the Mars middle atmosphere above 40 km is found to be very model-sensitive and thus difficult to simulate accurately in the absence of observations.

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Section: Resultscontrasting

confidence: 44%

Improved general circulation models of the Martian atmosphere from the surface to above 80 km

Forget¹,

Hourdin²,

Fournier³

et al. 1999

J. Geophys. Res.

1,058

1,109

View full text Add to dashboard Cite

show abstract

“…More recently, the camera aboard the Mars Pathfinder Lander photographed clouds under a variety of atmospheric conditions (Smith et al 1997). Clancy and Sandor (1998) suggested that the "blue" early morning clouds seen by the Pathfinder Lander could be composed of small (0.1-0.3 µm) CO 2 ice particles with particle densities of around 100 cm −3 forming at altitudes between 60 and 80 km. The altitude determination was based largely on the temperature profile of the atmosphere obtained during the Pathfinder descent.…”

Section: Introductionmentioning

confidence: 98%

CO2 Snow on Mars and Early Earth: Experimental Constraints

Glandorf

Colaprete

Tolbert

et al. 2002

Icarus

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“…This idea was first mentioned by the ASI/MET team (Schofield et al 1997) and was also preferred by Haberle et al (1999), who pointed to both dynamical and radiative local time effects as possible sources. The second view, recently presented by Clancy and Sandor (1998), is based on a series of microwave observations of CO lines and on a number of occultation experiments. According to these authors the difference between the cold martian mesosphere found by Pathfinder and the much warmer mesosphere found by Viking is not the result of different local times.…”

Section: Introductionmentioning

confidence: 99%