Search Results - "Tarduno, John A"

Young inner core inferred from Ediacaran ultra-low geomagnetic field intensity by Bono, Richard K., Tarduno, John A., Nimmo, Francis, Cottrell, Rory D.

“…An enduring mystery about Earth has been the age of its solid inner core. Plausible yet contrasting core thermal conductivity values lead to inner core growth…”
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A Hadean to Paleoarchean geodynamo recorded by single zircon crystals by Tarduno, John A., Cottrell, Rory D., Davis, William J., Nimmo, Francis, Bono, Richard K.

“…Knowing when the geodynamo started is important for understanding the evolution of the core, the atmosphere, and life on Earth. We report full-vector…”
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Hotspot motion caused the Hawaiian-Emperor Bend and LLSVPs are not fixed by Bono, Richard K., Tarduno, John A., Bunge, Hans-Peter

“…Controversy surrounds the fixity of both hotspots and large low shear velocity provinces (LLSVPs). Paleomagnetism, plate-circuit analyses, sediment facies,…”
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Rapid strengthening of westerlies accompanied intensification of Northern Hemisphere glaciation by Bridges, Joshua D., Tarduno, John A., Cottrell, Rory D., Herbert, Timothy D.

“…The trigger, pace, and nature of the intensification of Northern Hemisphere Glaciation (iNHG) are uncertain, but can be probed by study of ODP Site 1208 North…”
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Asteroid magnetization from the early solar wind by Anand, Atma, Carroll-Nellenback, Jonathan, Blackman, Eric G, Tarduno, John A

“…ABSTRACT Magnetic fields provide an important probe of the thermal, material, and structural history of planetary and sub-planetary bodies. Core dynamos are a…”
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Author Correction: Late Cambrian geomagnetic instability after the onset of inner core nucleation by Li, Yong-Xiang, Tarduno, John A., Jiao, Wenjun, Liu, Xinyu, Peng, Shanchi, Xu, Shihua, Yang, Aihua, Yang, Zhenyu

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Early Cambrian renewal of the geodynamo and the origin of inner core structure by Zhou, Tinghong, Tarduno, John A., Nimmo, Francis, Cottrell, Rory D., Bono, Richard K., Ibanez-Mejia, Mauricio, Huang, Wentao, Hamilton, Matt, Kodama, Kenneth, Smirnov, Aleksey V., Crummins, Ben, Padgett, Frank

“…Paleomagnetism can elucidate the origin of inner core structure by establishing when crystallization started. The salient signal is an ultralow field strength,…”
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Antiquity of the South Atlantic Anomaly and evidence for top-down control on the geodynamo by Tarduno, John A., Watkeys, Michael K., Huffman, Thomas N., Cottrell, Rory D., Blackman, Eric G., Wendt, Anna, Scribner, Cecilia A., Wagner, Courtney L.

“…The dramatic decay of dipole geomagnetic field intensity during the last 160 years coincides with changes in Southern Hemisphere (SH) field morphology and has…”
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Late Cambrian geomagnetic instability after the onset of inner core nucleation by Li, Yong-Xiang, Tarduno, John A., Jiao, Wenjun, Liu, Xinyu, Peng, Shanchi, Xu, Shihua, Yang, Aihua, Yang, Zhenyu

“…The Ediacaran Period marks a pivotal time in geodynamo evolution when the geomagnetic field is thought to approach the weak state where kinetic energy exceeds…”
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Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago by Tarduno, John A., Cottrell, Rory D., Watkeys, Michael K., Hofmann, Axel, Doubrovine, Pavel V., Mamajek, Eric E., Liu, Dunji, Sibeck, David G., Neukirch, Levi P., Usui, Yoichi

“…Stellar wind standoff by a planetary magnetic field prevents atmospheric erosion and water loss. Although the early Earth retained its water and atmosphere,…”
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A revised kinematic model for the relative motion between Pacific oceanic plates and North America since the Late Cretaceous by Doubrovine, Pavel V., Tarduno, John A.

“…The convergence between the Pacific, Farallon, and Kula oceanic plates and the North American plate has provided a driving force for tectonic processes that…”
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Conceptual knowledge shapes visual working memory for complex visual information by Sims, Chris R., Lerch, Rachel A., Tarduno, John A., Jacobs, Robert A.

“…Human visual working memory (VWM) is a memory store people use to maintain the visual features of objects and scenes. Although it is obvious that bottom-up…”
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Dataset of replicate Apollo sample magnetizations bearing on impacts and absence of a long-lived lunar dynamo by Cottrell, Rory D., Zhou, Tinghong, Tarduno, John A.

“…The absence or presence of a lunar paleomagnetosphere is important because it bears directly on the volatile content of the regolith and exploration targets…”
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Evidence for a Dynamo in the Main Group Pallasite Parent Body by Tarduno, John A., Cottrell, Rory D., Nimmo, Francis, Hopkins, Julianna, Voronov, Julia, Erickson, Austen, Blackman, Eric, Scott, Edward R.D., McKinley, Robert

“…Understanding the origin of pallasites, stony-iron meteorites made mainly of olivine crystals and FeNi metal, has been a vexing problem since their discovery…”
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A Large Ornithurine Bird (Tingmiatornis arctica) from the Turonian High Arctic: Climatic and Evolutionary Implications by Bono, Richard K., Clarke, Julia, Tarduno, John A., Brinkman, Donald

“…Bird fossils from Turonian (ca. 90 Ma) sediments of Axel Heiberg Island (High Canadian Arctic) are among the earliest North American records. The morphology of…”
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Observations and Models of the Long-Term Evolution of Earth’s Magnetic Field by Aubert, Julien, Tarduno, John A., Johnson, Catherine L.

“…The geomagnetic signal contains an enormous temporal range—from geomagnetic jerks on time scales of less than a year to the evolution of Earth’s dipole moment…”
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Evolving core conditions ca. 2 billion years ago detected by paleosecular variation by Smirnov, Aleksey V., Tarduno, John A., Evans, David A.D.

“…► A high-quality dataset on Neoarchean to Proterozoic geomagnetic secular variation. ► The relative geomagnetic field dipolarity decreases from the Neoarchean…”
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Absence of a long-lived lunar paleomagnetosphere by Tarduno, John A., Cottrell, Rory D., Lawrence, Kristin, Bono, Richard K., Huang, Wentao, Johnson, Catherine L., Blackman, Eric G., Smirnov, Aleksey V., Nakajima, Miki, Neal, Clive R., Zhou, Tinghong, Ibanez-Mejia, Mauricio, Oda, Hirokuni, Crummins, Ben

“…The Moon lacked a long-lived magnetic field of internal origin, and this allowed solar wind volatiles to accumulate in its soils. Determining the presence or…”
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Geomagnetic field strength 3.2 billion years ago recorded by single silicate crystals by Tarduno, John A, Watkeys, Michael K, Bauch, Dorothy, Cottrell, Rory D

“…The strength of the Earth's early geomagnetic field is of importance for understanding the evolution of the Earth's deep interior, surface environment and…”
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A lunar core dynamo limited to the Moon's first ~140 million years by Zhou, Tinghong, Tarduno, John A, Cottrell, Rory D, Neal, Clive R, Nimmo, Francis, Blackman, Eric G, Ibañez-Mejia, Mauricio

“…Single crystal paleointensity (SCP) reveals that the Moon lacked a long-lived core dynamo, though mysteries remain. An episodic dynamo, seemingly recorded by…”
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