Thermal Emission Imaging System (THEMIS) infrared observations of atmospheric dust and water ice cloud optical depth

Michael D. Smith, Joshua L. Bandfield, Philip Christensen, Mark I. Richardson

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The Mars Odyssey spacecraft entered into Martian orbit in October 2001 and after successful aerobraking, began mapping in February 2002. Thermal infrared images taken by the Thermal Emission Imaging System (THEMIS) on board the Odyssey spacecraft allow for the quantitative retrieval of atmospheric dust and water ice aerosol optical depth. Data collected so far cover late northern winter, spring, and summer (Ls = 330° - 160°). During this period, THEMIS observed the decay of a regional dust storm, a number of local dust storms along the edge of the retreating north polar cap, and the growth of the low-latitude aphelion water ice cloud belt. Data from THEMIS complements the concurrent Mars Global Surveyor Thermal Emission Spectrometer (TES) data by sampling a later local time (∼1400 LT for TES versus ∼1600-1730 LT for THEMIS) and by observing at much higher spatial resolution. Comparison of water ice optical depth in the aphelion cloud belt from THEMIS and TES shows a significantly higher optical depth in the late afternoon (THEMIS) than in the early afternoon (TES).

Original languageEnglish (US)
Pages (from-to)1
Number of pages1
JournalJournal of Geophysical Research E: Planets
Volume108
Issue number11
StatePublished - Nov 25 2003

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ice clouds
Ice
thermal emission
Imaging systems
optical thickness
optical depth
Dust
dust
Infrared radiation
ice
Water
water
spectrometer
Spectrometers
spectrometers
dust storms
dust storm
Mars
spacecraft
Spacecraft

Keywords

  • Cloud
  • Dust
  • Mars
  • Optical depth
  • THEMIS
  • Water ice

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Thermal Emission Imaging System (THEMIS) infrared observations of atmospheric dust and water ice cloud optical depth. / Smith, Michael D.; Bandfield, Joshua L.; Christensen, Philip; Richardson, Mark I.

In: Journal of Geophysical Research E: Planets, Vol. 108, No. 11, 25.11.2003, p. 1.

Research output: Contribution to journalArticle

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N2 - The Mars Odyssey spacecraft entered into Martian orbit in October 2001 and after successful aerobraking, began mapping in February 2002. Thermal infrared images taken by the Thermal Emission Imaging System (THEMIS) on board the Odyssey spacecraft allow for the quantitative retrieval of atmospheric dust and water ice aerosol optical depth. Data collected so far cover late northern winter, spring, and summer (Ls = 330° - 160°). During this period, THEMIS observed the decay of a regional dust storm, a number of local dust storms along the edge of the retreating north polar cap, and the growth of the low-latitude aphelion water ice cloud belt. Data from THEMIS complements the concurrent Mars Global Surveyor Thermal Emission Spectrometer (TES) data by sampling a later local time (∼1400 LT for TES versus ∼1600-1730 LT for THEMIS) and by observing at much higher spatial resolution. Comparison of water ice optical depth in the aphelion cloud belt from THEMIS and TES shows a significantly higher optical depth in the late afternoon (THEMIS) than in the early afternoon (TES).

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