Martian polar vortices: Comparison of reanalyses

Details

• Journal Title:
  Journal of Geophysical Research: Planets
• Personal Author:
  Waugh, D. W. ; Toigo, A. D. ; Guzewich, S. D. ; Greybush, S. J. ; Wilson, R. J. ; Montabone, L.
• NOAA Program & Office:
  GFDL (Geophysical Fluid Dynamics Laboratory) ; OAR (Oceanic and Atmospheric Research)
• Description:
  The structure and evolution of the Martian polar vortices is examined using two recently available reanalysis systems: version 1.0 of the Mars Analysis Correction Data Assimilation (MACDA) and a preliminary version of the Ensemble Mars Atmosphere Reanalysis System (EMARS). There is quantitative agreement between the reanalyses in the lower atmosphere, where Mars Global Surveyor (MGS) Thermal Emission Spectrometer (TES) data are assimilated, but there are differences at higher altitudes reflecting differences in the free‐running general circulation model simulations used in the two reanalyses. The reanalyses show similar potential vorticity (PV) structure of the vortices: There is near‐uniform small PV equatorward of the core of the westerly jet, steep meridional PV gradients on the polar side of the jet core, and a maximum of PV located off of the pole. In maps of 30 sol mean PV, there is a near‐continuous elliptical ring of high PV with roughly constant shape and longitudinal orientation from fall to spring. However, the shape and orientation of the vortex varies on daily time scales, and there is not a continuous ring of PV but rather a series of smaller scale coherent regions of high PV. The PV structure of the Martian polar vortices is, as has been reported before, very different from that of Earth's stratospheric polar vortices, but there are similarities with Earth's tropospheric vortices which also occur at the edge of the Hadley Cell, and have near‐uniform small PV equatorward of the jet, and a large increase of PV poleward of the jet due to increased stratification.
• Keywords:
  Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Space And Planetary Science Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Space And Planetary Science Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Space And Planetary Science
• Source:
  Journal of Geophysical Research: Planets, 121(9), 1770-1785
• DOI:
  https://doi.org/10.1002/2016je005093
• ISSN:
  2169-9097 ; 2169-9100
• Format:
  PDF
• Publisher:
  American Geophysical Union (AGU)
• Document Type:
  Journal Article
• Rights Information:
  Other
• Compliance:
  Library
• Main Document Checksum:
  urn:sha-512:61d483a4c994f1d89fad884db7ee816a94d0505107ff45863e4b8dbfc5eccef9b7f3ee10d7d923c05ee195c2d169280a49444d4b2eb59864882c68fe62de37d7
• Download URL:
  https://repository.library.noaa.gov/view/noaa/63775/noaa_63775_DS1.pdf
• File Type:
  [PDF - 3.79 MB ]