Computer Science – Sound
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p11b..12s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P11B-12
Computer Science
Sound
0305 Aerosols And Particles (0345, 4801), 0394 Instruments And Techniques, 5409 Atmospheres: Structure And Dynamics, 5445 Meteorology (3346), 5464 Remote Sensing
Scientific paper
The Thermal Emission Imaging System (THEMIS) is continuing the infrared global monitoring of Martian dust and water ice aerosols as well as atmospheric temperatures started by the Mariner 9 Infrared Interferometric Spectrometer (IRIS), Viking Infrared Thermal Mapper (IRTM), and the Mars Global Surveyor (MGS) Thermal Emission Spectrometer (TES) instruments. Aerosol optical depth is retrieved in a manner similar to retrieval algorithms used with TES data. THEMIS 9 point spectra are converted to the equivalent column integrated optical depth. The relative contributions of dust and water ice to the observed optical depth are then determined using a least squares fit of predetermined water ice and dust opacity spectral shapes to the measured THEMIS optical depth. Several refinements have been made to the aerosol opacity retrieval algorithms for increased accuracy of both aerosol abundances as well as surface temperatures. The opacity retrieval algorithm iteratively solves for a self-consistent solution for surface temperature as well as aerosol abundance. As a result, no atmospheric transparency wavelength needs to be assumed. Surface emissivity maps are also now incorporated into the retrieval algorithm. Results to date are consistent with concurrent TES observations, displaying low dust opacities and the onset of the perihelion water ice cloud belt as Mars progresses towards northern summer. The Mars Odyssey mission plan includes observations that drift from local times of approximately 3-6 PM. These local times combined with concurrent TES observations of a local time of 2 PM will allow for some resolution of diurnal atmospheric variations, such as water ice cloud abundances. The THEMIS investigation will extend the continuous infrared monitoring of the Martian atmosphere, bridging the MGS TES and the 2005 Mars Reconnaissance Orbiter (MRO) Mars Climate Sounder (MCS) investigations. This continuous long-term monitoring is essential for the understanding of the atmospheric processes and cycles present in the Martian atmosphere.
Bandfield Joshua L.
Christensen Per Rex
Richardson Mark I.
Smith Masson D.
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