Spatial and Temporal Variation of Mars South Polar Ice Composition from Spectral Endmember Classification of CRISM Mapping Data DOI Open Access
S. F. A. Cartwright, W. M. Calvin, F. P. Seelos

и другие.

Authorea (Authorea), Год журнала: 2023, Номер unknown

Опубликована: Окт. 17, 2023

Multispectral mapping data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) provide a unique opportunity to characterize south polar ice deposits at higher spectral sampling, spatial resolution, or spatiotemporal coverage than previous work. This new perspective can help constrain nature and distribution of different mixtures CO ice, HO dust that influence formation, evolution, preservation climate records. We processed 1103 CRISM observations spanning southern summer six Years (MY) through combination k -means clustering random forest classification. Using set 12 endmembers directly tied work with high-resolution targeted data, we made series temporally restricted mosaics showing surface variation over time. The show effects MY 28 storm on removal seasonal cap year reveal how this process differed years followed. A mosaic residual surfaces displays broad agreement compositional maps while resolving details in ice-rich material around periphery bright cap. By composition varies across swath region though time, endmember classified produced critical context future studies dynamic processes shape deposits.

Язык: Английский

Revelations of interannual dune evolution from the swiftest aeolian system on Mars by MRO/HiRISE long-term monitoring DOI Creative Commons
M. Chojnacki, D. A. Vaz, Pruthviraj J. Acharya

и другие.

Icarus, Год журнала: 2023, Номер 419, С. 115863 - 115863

Опубликована: Ноя. 11, 2023

The north polar region of Mars, with its greater atmospheric pressure and vast inventory ever-changing volatiles (e.g., CO2, H2O), hosts arguably the most active diverse aeolian bedform systems on planet. Here, we explore how these dune fields evolve spatiotemporally using up to 8 Mars years (16 Earth years) MRO HiRISE observations test impact various boundary conditions annual mobility. A high degree sand flux heterogeneity was observed for some dunes, whereas other sites displayed steady-state migration relative long-term rates. These large changes in are attributed variable length frost-free seasons, sediment availability relation timing peak katabatic winds, influence global dust storms seasonal ice thickness. Consistent our previous work, continue observe extremely transport rates at Olympia Cavi. All stages system evolution observable (sand patch > protodune dune), along additional phenomena not previously outside terrestrial settings calving collisions, remote transfer). Transitory protodunes may from modest mounds prominent barchans slipfaces several meters tall within 3–5 years, while adjacent duneforms suffer collapse as they lose supply. Martian protodunes, which appear be larger than equivalents, mature dunes found downwind among swiftest yet reported Mars. rapidly evolving cryo-aeolian provide a window into longer-term landscape non-polar fields.

Язык: Английский

Процитировано

6
MRO overview: Sixteen years in Mars orbit DOI Creative Commons
Richard W. Zurek, L. K. Tamppari,

M. Dan Johnston

и другие.

Icarus, Год журнала: 2024, Номер 419, С. 116102 - 116102

Опубликована: Май 22, 2024

Launched on August 12, 2005, the Mars Reconnaissance Orbiter (MRO) entered orbit March 10, 2006. Following a period of aerobraking, MRO completed its entry into primary science in September 2006, initiating program systematic observations that still continues. Five providers, including Italian Space Agency, provided 6 instruments for flight, observing surface, atmosphere, and subsurface with greater spatial resolution coverage than ever before. Two investigations utilized spacecraft accelerometers tracking orbiter via Deep Network to study upper atmosphere densities gravity field planet. The data acquired by have revealed dynamic planet whose change from an ancient wetter climate drier today was complex transition not simple "drying out". Furthermore, continues even today. diversity early habitable environments, ice ages recorded polar cap layering deposits, repeating patterns dust storms, revelation new features at limit are all part scientific return during nearly decade years. story mission, evolution capabilities, contributions our current understanding subject two dozen papers Icarus special issue, MRO: Sixteen Years Observing Changing Mars. Three describe more detail instrument operations products over mission; several analysis techniques radar, construction 3-dimensional views, atmospheric sounder, enabling better retrievals dusty lower atmosphere. Other report recent research including, but limited to, dune movement, roles water carbon dioxide surface change, attempts understand formation fading enigmatic recurring slope lineae. This paper describes general aspects spacecraft, payload, mission as context issue papers; it also summarizes results support events phase basis give time history discovery effort.

Язык: Английский

Процитировано

2
A comparison of CO2 seasonal activity in Mars' northern and southern hemispheres DOI Creative Commons
C. J. Hansen, Shane Byrne, W. M. Calvin

и другие.

Icarus, Год журнала: 2023, Номер 419, С. 115801 - 115801

Опубликована: Сен. 19, 2023

Carbon dioxide is Mars' most active volatile. The seasonal and diurnal processes of when where it condenses sublimates are determined by energy balance between the atmosphere surface ice in vapor pressure equilibrium climate. current obliquity ensures that polar caps stable locations for condensation. eccentricity orbit major driver differences behavior CO2 northern vs southern hemisphere. In particular, seasons perihelion aphelion, addition to large elevation difference poles, dominate ways transpire two hemispheres. We summarize discuss unprecedented observations these have been collected Mars Reconnaissance Orbiter over last 8.5 Years. longer fall winter allows more time accumulate densify Northern coincides with dust storm season, thus north deposits expected contain a greater concentration relation H2O ices. With less densification contaminants layer likely weaker than layer.

Язык: Английский

Процитировано

4
Spatial and Temporal Variation of Mars South Polar Ice Composition From Spectral Endmember Classification of CRISM Mapping Data DOI Creative Commons
S. F. A. Cartwright, W. M. Calvin, F. P. Seelos

и другие.

Journal of Geophysical Research Planets, Год журнала: 2023, Номер 128(11)

Опубликована: Ноя. 1, 2023

Abstract Multispectral mapping data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) provide a unique opportunity to characterize south polar ice deposits at higher spectral sampling, spatial resolution, or spatiotemporal coverage than previous work. This new perspective can help constrain nature and distribution of different mixtures CO 2 ice, H O dust that influence formation, evolution, preservation climate records. We processed 1,103 CRISM observations spanning southern summer six Years (MYs) through combination k ‐means clustering random forest classification. Using set 12 endmembers directly tied work with high‐resolution targeted data, we made series temporally restricted mosaics showing surface variation over time. The show effects MY 28 storm on removal seasonal cap year reveal how this process differed years followed. A mosaic residual surfaces displays broad agreement compositional maps while resolving details in ice‐rich material around periphery bright cap. By composition varies across swath region time, endmember classified produced critical context future studies dynamic processes shape deposits.

Язык: Английский

Процитировано

1
Spatial and Temporal Variation of Mars South Polar Ice Composition from Spectral Endmember Classification of CRISM Mapping Data DOI Open Access
S. F. A. Cartwright, W. M. Calvin, F. P. Seelos

и другие.

Authorea (Authorea), Год журнала: 2023, Номер unknown

Опубликована: Авг. 12, 2023

Multispectral mapping data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) provide a unique opportunity to characterize south polar ice deposits at higher spectral sampling, spatial resolution, or spatiotemporal coverage than previous work. This new perspective can help constrain nature and distribution of different mixtures CO2 ice, H2O dust that influence formation, evolution, preservation climate records. We processed 1103 CRISM observations spanning southern summer six Years (MY) through combination k-means clustering random forest classification. Using set 12 endmembers directly tied work with high-resolution targeted data, we made series temporally restricted mosaics showing surface variation over time. The show effects MY 28 storm on removal seasonal cap year details how this process differed years followed. A mosaic residual surfaces displays broad agreement compositional maps while resolving in ice-rich material around periphery bright cap. By composition varies across swath region though time, endmember classified produced critical context future studies dynamic processes shape deposits.

Язык: Английский

Процитировано

0
Spatial and Temporal Variation of Mars South Polar Ice Composition from Spectral Endmember Classification of CRISM Mapping Data DOI Open Access
S. F. A. Cartwright, W. M. Calvin, F. P. Seelos

и другие.

Authorea (Authorea), Год журнала: 2023, Номер unknown

Опубликована: Окт. 17, 2023

Multispectral mapping data from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) provide a unique opportunity to characterize south polar ice deposits at higher spectral sampling, spatial resolution, or spatiotemporal coverage than previous work. This new perspective can help constrain nature and distribution of different mixtures CO ice, HO dust that influence formation, evolution, preservation climate records. We processed 1103 CRISM observations spanning southern summer six Years (MY) through combination k -means clustering random forest classification. Using set 12 endmembers directly tied work with high-resolution targeted data, we made series temporally restricted mosaics showing surface variation over time. The show effects MY 28 storm on removal seasonal cap year reveal how this process differed years followed. A mosaic residual surfaces displays broad agreement compositional maps while resolving details in ice-rich material around periphery bright cap. By composition varies across swath region though time, endmember classified produced critical context future studies dynamic processes shape deposits.

Язык: Английский

Процитировано

0