Jack Holt. Wednesday, April 25, 2:30-3:30 p.m., The Arizona Senior Academy Building.
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Poetry Center evolves from quaint to nationally prominent in 60 years, People are painting their walls more now — and these are their go-to colors, Children produce weaker coronavirus antibodies, study finds. Oberlin Kansas. This force twists the winds â and the troughs they create â into spiral shapes. Jack Holt. The new study is intended to further the debate around the possibility of liquid water on Mars. Second, as they blow down, they are deflected by the Coriolis force, which is caused by the planet's spinning in space.
Jack Holt. © 2020 The Arizona Board of Regents on behalf of The University of Arizona.
"These anomalous features have gone unexplained for 40 years because we have not been able to see what lies beneath the surface," said Roberto Seu, team leader for the SHARAD instrument.
They claimed radar observations detected evidence of liquid water at the base of Mars’ south polar ice cap; however, the study did not address how liquid water could have gotten there. Hays, Kansas. Tel: (520) 621-6000 Fax: (520) 621-2672. B. LPL Director & Department Head Position Description & Application, Lunar and Planetary Laboratory & Department of Planetary Sciences | The University of Arizona.
", "Nobody realized that there would be such complex structures in the layers," said Holt, the lead author of the paper focusing on Chasma Boreale.
Current City and Hometown. The spiral trough results vindicate an early explanation that had fallen out of favor in parts of the Mars scientific community.
Holt is second author on the trough paper. It’s really a critical piece of the puzzle,” said Holt, who was not involved in the research. Hays, Kansas.
Analyzing radar data on a computer, scientists can peel back the layers like an onion to reveal how the ice cap evolved over time. The study’s authors argue that magma from the deep interior of Mars rose towards the planet’s surface about 300,000 years ago. "But when you look at a hypothetical cross section from his paper, it looks almost exactly like what we see in the radar data.". On Earth, large ice sheets are shaped mainly by ice flow. Since they were discovered in 1972, scientists have proposed several hypotheses for how they formed. This research, however, reveals many complex features â including layers that change in thickness and orientation, or abruptly disappear in some places â making it a virtual gold mine of climate information. Or, stay in the loop using our Amazon Alexa skill.
He is a Co-Investigator on the SHARAD radar sounder instrument on the Mars Reconnaissance Orbiter, conducts airborne geophysical studies of Alaskan glaciers as part of NASA’s Operation IceBridge, and has worked extensively in Antarctica. As the magma chamber cooled, it released heat that melted the ice at the base of the ice sheet. University Information Security and Privacy. Hometown. “Different people may go different ways with this, and we’re really interested to see how the community reacts to it,” said Michael Sori, an associate staff scientist in the Lunar and Planetary Laboratory at the University of Arizona and a co-lead author of the new paper.
Jack Holt, a professor at the at the Lunar and Planetary Laboratory, said the question of how water could exist underneath the south polar ice cap came to his mind immediately after the Science paper was published, and the new paper adds an important constraint on the possibility of water being there.
Because under normal conditions, it should be too cold,” Sori said. © 2020 The Arizona Board of Regents on behalf of The University of Arizona. One suggested that as the planet spins, ice closer to the poles moves slower than ice farther from the poles, causing the semi-fluid ice to crack. The northern ice cap is a stack of ice and dust layers up to two miles deep, covering an area slightly larger than Texas. B., Hayne, P. O., Byrne, S., Becerra, P., Kahre, M., Calvin, W., Hvidberg, C., Milkovich, S., Buhler, P., Landis, M., Horgan, B., Kleinböhl, A., Perry, M. R., Obbard, R., Stern, J., Piqueux, S., Thomas, N., Zacny, K., Carter, L., Edgar, L., Emmett, J., Navarro, T., Hanley, J., Koutnik, M., Putzig, N., Henderson, B. L., Holt, J. W., Ehlmann, B., Parra, S., Lalich, D., Hansen, C., Hecht, M., Banfield, D., Herkenhoff, K., Paige, D. A., Skidmore, M., Staehle, R. L., Siegler, M. The Holy Grail: A road map for unlocking the climate record stored within Mars' polar layered deposits 2020P&SS..18404841S, Petersen, E. I., Levy, J. S., Holt, J. W., Stuurman, C. M. New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure 2020JGlac..66....1P, Lim, Y., Holt, J. W. Bayesian modeling of the nuclear equation of state for neutron star tidal deformabilities and GW170817 2019EPJA...55..209L, Whitehead, T. R., Lim, Y., Holt, J. W. Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials 2019PhRvC.100a4601W, Lalich, D. E., Holt, J. W., Smith, I.
Co-authors on the paper "The Construction of Chasma Boreale on Mars" include Kathryn Fishbaugh (Smithsonian National Air and Space Museum), Sarah Christian (The University of Texas at Austin Institute for Geophysics and Bryn Mawr College), Kenneth Tanaka (Astrogeology Science Center, U.S. Geological Survey), Patrick Russell (Planetary Science Institute in Tucson, Arizona), Ken Herkenhoff (Astrogeology Science Center, U. S. Geological Survey), Ali Safaeinili (Jet Propulsion Laboratory), Nathaniel Putzig (Southwest Research Institute) and Roger Phillips (Southwest Research Institute). Dr. John W. “Jack” Holt, University of Arizona. "In this study, we've figured out that the canyon has actually always been there and the ice cap grew up on either side of it. The group studying a canyon feature called Chasma Boreale included Shane Byrne from the University of Arizona's Lunar and Planetary Laboratory.
Jack Holt and Isaac Smith of The University of Texas at Austin's Institute for Geophysics are the papers' lead authors. In the new study, Sori and his co-authors first assumed the detection of liquid water underneath the ice cap was correct and then worked to figure out what parameters were needed for the water to exist. Radar Reflectivity as a Proxy for the Dust Content of Individual Layers in the Martian North Polar Layered Deposits 2019JGRE..124.1690L, Nerozzi, S., Holt, J. W. Buried Ice and Sand Caps at the North Pole of Mars: Revealing a Record of Climate Change in the Cavi Unit With SHARAD 2019GeoRL..46.7278N, Spikes, K. T., Tisato, N., Hess, T. E., Holt, J. W. Comparison of geophone and surface-deployed distributed acoustic sensing seismic data 2019Geop...84A..25S, Petersen, E. I., Holt, J. W., Levy, J. S. High Ice Purity of Martian Lobate Debris Aprons at the Regional Scale: Evidence From an Orbital Radar Sounding Survey in Deuteronilus and Protonilus Mensae 2018GeoRL..4511595P, Nerozzi, S., Holt, J. W. Earliest accumulation history of the north polar layered deposits, Mars from SHARAD 2018Icar..308..128N, Brothers, S. C., Kocurek, G., Holt, J. W. Sequence architecture of the cavi unit, Chasma Boreale, Mars 2018Icar..308...42B, Golynsky, A. V., Ferraccioli, F., Hong, J. K., Golynsky, D. A., von Frese, R. R. B., Young, D. A., Blankenship, D. D., Holt, J. W., Ivanov, S. V., Kiselev, A. V., Masolov, V. N., Eagles, G., Gohl, K., Jokat, W., Damaske, D., Finn, C., Aitken, A., Bell, R. E., Armadillo, E., Jordan, T. A., Greenbaum, J. S., Bozzo, E., Caneva, G., Forsberg, R., Ghidella, M., Galindo-Zaldivar, J., Bohoyo, F., Martos, Y. M., Nogi, Y., Quartini, E., Kim, H. R., Roberts, J. L. New Magnetic Anomaly Map of the Antarctic 2018GeoRL..45.6437G, Holt, J. W., Kaiser, N., Whitehead, T. R. Tensor Fermi liquid parameters in nuclear matter from chiral effective field theory 2018PhRvC..97e4325H, Levy, J. S., Fassett, C. I., Rader, L. X., King, I. R., Chaffey, P. M., Wagoner, C. M., Hanlon, A. E., Watters, J. L., Kreslavsky, M. A., Holt, J. W., Russell, A. T., Dyar, M. D. Distribution and Characteristics of Boulder Halos at High Latitudes on Mars: Ground Ice and Surface Processes Drive Surface Reworking 2018JGRE..123..322L, Dundas, C. M., Bramson, A. M., Ojha, L., Wray, J. J., Mellon, M. T., Byrne, S., McEwen, A. S., Putzig, N. E., Viola, D., Sutton, S., Clark, E., Holt, J. W. Exposed subsurface ice sheets in the Martian mid-latitudes 2018Sci...359..199D, Gillespie, M. K., Lawson, W., Rack, W., Anderson, B., Blankenship, D. D., Young, D. A., Holt, J. W. Geometry and ice dynamics of the Darwin-Hatherton glacial system, Transantarctic Mountains 2017JGlac..63..959G, Holt, J. W., Kaiser, N. Equation of state of nuclear and neutron matter at third-order in perturbation theory from chiral effective field theory 2017PhRvC..95c4326H, Holt, J. W., Kuo, T. T. S., Phua, K. K., Rho, M., Zahed, I. Jack Holt.
He has received numerous awards and honors and has published widely in his field.
This could provide a more favorable environment for liquid water and thus, perhaps, life.”. "Many people proposed other hypotheses suggesting he was wrong," he said. Director, Earth Dynamics Observatory and Professor, Planetary Sciences, Geosciences, and Lunar and Planetary Laboratory, Associate Professor, Hydrology and Atmospheric Sciences, Associate Professor, Lunar and Planetary Laboratory, Professor, Hydrology and Atmospheric Sciences, Assistant Professor, School of Natural Resources and the Environment, Assistant Professor, Aerospace and Mechanical Engineering, Program Assistant, Earth Dynamics Observatory, 1629 E University Blvd Tucson AZ 85721-0092, Supported by the Lunar Planetary Laboratory, University Information Security and Privacy.
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