UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Mars' atmosphere: The sister planet, our statistical twin

Chen, W; Lovejoy, S; Muller, J-P; (2016) Mars' atmosphere: The sister planet, our statistical twin. Journal of Geophysical Research: Atmospheres , 121 (20) 11,968-11,988. 10.1002/2016JD025211. Green open access

[img]
Preview
Text
Chen_et_al-2016-Journal_of_Geophysical_Research__Atmospheres.pdf - Published version

Download (2MB) | Preview

Abstract

Satellite-based Martian reanalyses have allowed unprecedented comparisons between our atmosphere and that of our sister planet, underlining various similarities and differences in their respective dynamics. Yet by focusing on large scale structures and deterministic mechanisms they have improved our understanding of the dynamics only over fairly narrow ranges of (near) planetary scales. However, the Reynolds numbers of the flows on both planets are larger than 1011 and dissipation only occurs at centimetric (Mars) or millimetric scales (Earth) so that over most of their scale ranges, the dynamics are fully turbulent. In this paper, we therefore examine the high-level, statistical, turbulent laws for the temperature, horizontal wind, and surface pressure, finding that Earth and Mars have virtually identical statistical exponents so that their statistics are very similar over wide ranges. Therefore, it would seem that with the exception of certain aspects of the largest scales (such as the role of dust in atmospheric heating on Mars, or of water in its various phases on Earth), that the nonlinear dynamics are very similar. We argue that this is a prediction of the classical laws of turbulence when extended to planetary scales and that it supports our use of turbulent laws on both planetary atmospheres.

Type: Article
Title: Mars' atmosphere: The sister planet, our statistical twin
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/2016JD025211
Publisher version: http://dx.doi.org/10.1002/2016JD025211
Language: English
Additional information: ©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1532189
Downloads since deposit
53Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item