Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season
Abstract Diurnal analyses of water ice cloud optical depths retrieved from thermal infrared spectra by the Emirates Mars Infrared Spectrometer showed changing cloud abundance throughout the Martian day. Observations began with the start of the Emirates Mars Mission science phase near the beginning o...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-08-01
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| Series: | Geophysical Research Letters |
| Online Access: | https://doi.org/10.1029/2022GL099654 |
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| author | Samuel A. Atwood Michael D. Smith Khalid Badri Christopher S. Edwards Philip R. Christensen Michael J. Wolff François Forget Saadat Anwar Nathan Smith M. R. El‐Maarry |
| author_facet | Samuel A. Atwood Michael D. Smith Khalid Badri Christopher S. Edwards Philip R. Christensen Michael J. Wolff François Forget Saadat Anwar Nathan Smith M. R. El‐Maarry |
| author_sort | Samuel A. Atwood |
| collection | DOAJ |
| description | Abstract Diurnal analyses of water ice cloud optical depths retrieved from thermal infrared spectra by the Emirates Mars Infrared Spectrometer showed changing cloud abundance throughout the Martian day. Observations began with the start of the Emirates Mars Mission science phase near the beginning of aphelion‐season in Mars Year 36 and included the prominent aphelion cloud belt (ACB) and orographic clouds in the vicinity of volcanoes. A midday minimum with higher morning and afternoon optical depths was typical for the ACB, though with considerable spatial variability in this diurnal pattern. Clouds near volcanoes reached a minimum before local noon and tended to increase in abundance throughout the afternoon. Comparisons against the Laboratoire de Météorologie Dynamique global circulation model showed analogous spatial patterns in the diurnal signal, which suggested thermal tides and topographic effects to be the predominant drivers of ACB variability, while more localized circulations affected volcano clouds. |
| format | Article |
| id | doaj-art-ebe643e7786544958d9c0112be2cb6da |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-ebe643e7786544958d9c0112be2cb6da2025-08-20T03:10:20ZengWileyGeophysical Research Letters0094-82761944-80072022-08-014915n/an/a10.1029/2022GL099654Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐SeasonSamuel A. Atwood0Michael D. Smith1Khalid Badri2Christopher S. Edwards3Philip R. Christensen4Michael J. Wolff5François Forget6Saadat Anwar7Nathan Smith8M. R. El‐Maarry9Space and Planetary Science Center, and Department of Earth Sciences Khalifa University Abu Dhabi UAENASA Goddard Space Flight Center Greenbelt MD USAMohammed Bin Rashid Space Center Dubai UAEDepartment of Astronomy and Planetary Science Northern Arizona University Flagstaff AZ USASchool of Earth and Space Exploration Arizona State University Tempe AZ USASpace Science Institute Boulder CO USALaboratoire de Météorologie Dynamique Paris FranceSchool of Earth and Space Exploration Arizona State University Tempe AZ USADepartment of Astronomy and Planetary Science Northern Arizona University Flagstaff AZ USASpace and Planetary Science Center, and Department of Earth Sciences Khalifa University Abu Dhabi UAEAbstract Diurnal analyses of water ice cloud optical depths retrieved from thermal infrared spectra by the Emirates Mars Infrared Spectrometer showed changing cloud abundance throughout the Martian day. Observations began with the start of the Emirates Mars Mission science phase near the beginning of aphelion‐season in Mars Year 36 and included the prominent aphelion cloud belt (ACB) and orographic clouds in the vicinity of volcanoes. A midday minimum with higher morning and afternoon optical depths was typical for the ACB, though with considerable spatial variability in this diurnal pattern. Clouds near volcanoes reached a minimum before local noon and tended to increase in abundance throughout the afternoon. Comparisons against the Laboratoire de Météorologie Dynamique global circulation model showed analogous spatial patterns in the diurnal signal, which suggested thermal tides and topographic effects to be the predominant drivers of ACB variability, while more localized circulations affected volcano clouds.https://doi.org/10.1029/2022GL099654 |
| spellingShingle | Samuel A. Atwood Michael D. Smith Khalid Badri Christopher S. Edwards Philip R. Christensen Michael J. Wolff François Forget Saadat Anwar Nathan Smith M. R. El‐Maarry Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season Geophysical Research Letters |
| title | Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season |
| title_full | Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season |
| title_fullStr | Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season |
| title_full_unstemmed | Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season |
| title_short | Diurnal Variability in EMIRS Daytime Observations of Water Ice Clouds During Mars Aphelion‐Season |
| title_sort | diurnal variability in emirs daytime observations of water ice clouds during mars aphelion season |
| url | https://doi.org/10.1029/2022GL099654 |
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