Growth of C02 frost thickness near Chasma Borealis during northern winter and spring.

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Epithermal neutron fluxes measured using the Neutron Spectrometer component of the Mars OdysscNGamma-Ray Spectrometer suite of instruments were studied to determ i ne the spatial and temporal dependence of CO2 frost cover of the nor t h polar cap for L, between 329 and 99 arcoccntric longitude. This time period spans the la t e northern xvinter through summer solstice . In the absence of a CO, cuvcr, the entire basement terrain p o l eward of about +55 latitude is vm, rich in I1 :0 . The consequent enhanced abundance of hydrogen in near-surface soils leads to an anomaluusly ... continued below

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[3] p.

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Feldman, W. C. (William C.); Boynton, W. V. (William V.); Prettyman, T. H. (Thomas H.); Kelly, N. & Maurice, S. (Sylvestre) January 1, 2003.

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Epithermal neutron fluxes measured using the Neutron Spectrometer component of the Mars OdysscNGamma-Ray Spectrometer suite of instruments were studied to determ i ne the spatial and temporal dependence of CO2 frost cover of the nor t h polar cap for L, between 329 and 99 arcoccntric longitude. This time period spans the la t e northern xvinter through summer solstice . In the absence of a CO, cuvcr, the entire basement terrain p o l eward of about +55 latitude is vm, rich in I1 :0 . The consequent enhanced abundance of hydrogen in near-surface soils leads to an anomaluusly low flux of oumardly leaking cpithcrmal ncutrons, wh i ch is a prominent signatu r e of epi t hermal neutron maps measured after about L, = 90 . Because the epithermal neutron flux rises monotonically w i t h increasing thickness of t h e CO . fros t cover, it provides a robust measure of the CO2 thickness in space and time .

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[3] p.

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  • Submitted to: Lunar And Planetary Science Conference, Houston, TX, March 17-21, 2003

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  • Report No.: LA-UR-03-0427
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976519
  • Archival Resource Key: ark:/67531/metadc929750

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  • January 1, 2003

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 6:31 p.m.

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Feldman, W. C. (William C.); Boynton, W. V. (William V.); Prettyman, T. H. (Thomas H.); Kelly, N. & Maurice, S. (Sylvestre). Growth of C02 frost thickness near Chasma Borealis during northern winter and spring., article, January 1, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc929750/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.