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Taylor, Patrick
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Taylor, Patrick
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Taylor, P. T.
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- PublicationOpen AccessSatellite magnetic anomalies of the Antarctic crust(1999-04)
; ; ; ; ; ; ; ; ;von Frese, R. R. B.; Byrd Polar Research Center and Department of Geological Sciences, The Ohio State University, Columbus, OH 43210, U.S.A. ;Kim, H.R.; Byrd Polar Research Center and Department of Geological Sciences, The Ohio State University, Columbus, OH 43210, U.S.A. ;Tan, L.; Byrd Polar Research Center and Department of Geological Sciences, The Ohio State University, Columbus, OH 43210, U.S.A. ;Kim, J. W.; Department of Earth Sciences, Sejong University, Republic of Korea ;Taylor, P. T.; NASA Geodynamics Branch, Code 921, Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A. ;Purucker, M. E.; RSTX at NASA Geodynamics Branch, Code 921, Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A. ;Alsdorf, D. E.; Department of Geological Sciences, Cornell University, Ithaca, NY 14853, U.S.A ;Raymond, C. A.; et Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, U.S.A.; ; ; ; ; ; ; Spatially and temporally static crustal magnetic anomalies are contaminated by static core field effects above spherical harmonic degree 12 and dynamic, large-amplitude external fields. To extract crustal magnetic anomalies from the measurements of NASA's Magsat mission, we separate crustal signals from both core and external field effects. In particular, we define Magsat anomalies relative to the degree 11 field and use spectral correlation theory to reduce them for external field effects. We obtain a model of Antarctic crustal thickness by comparing the region's terrain gravity effects to free-air gravity anomalies derived from the Earth Gravity Model 1996 (EGM96). To separate core and crustal magnetic effects, we obtain the pseudo-magnetic effect of the crustal thickness variations from their gravity effect via Poisson's theorem for correlative potentials. We compare the pseudo-magnetic effect of the crustal thickness variations to field differences between degrees 11 and 13 by spectral correlation analysis. We thus identify and remove possible residual core field effects in the Magsat anomalies relative to the degree 11 core field. The resultant anomalies reflect possible Antarctic contrasts due both to crustal thickness and intracrustal variations of magnetization. In addition, they provide important constraints on the geologic interpretation of aeromagnetic survey data, such as are available for the Weddell Province. These crustal anomalies also may be used to correct for long wavelength errors in regional compilations of near-surface magnetic survey data. However, the validity of these applications is limited by the poor quality of the Antarctic Magsat data that were obtained during austral Summer and Fall when south polar external field activity was maximum. Hence an important test and supplement for the Antarctic crustal Magsat anomaly map will be provided by the data from the recently launched Ørsted mission, which will yield coverage over austral Winter and Spring periods when external field activity is minimal.239 1006 - PublicationOpen AccessMaking a Better Magnetic Map(2016)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;A new version of the World Digital Magnetic Anomaly Map, released last summer, gives greater insight into the structure and history of Earth's crust and upper mantle.71 99 - PublicationOpen AccessMapping and interpretation of satellite magnetic anomalies from POGO data over the Antarctic region(1999-04)
; ; ; ;Purucker, M. E.; Raytheon ITSS at Geodynamics Branch, Goddard Space Flight Center, Greenbelt, MD, U.S.A. ;von Frese, R. R. B.; Byrd Polar Research Center and Department of Geological Sciences, The Ohio State University, Ohio, U.S.A. ;Taylor, P. T.; NASA, Geodynamics Branch, Goddard Space Flight Center, Greenbelt, MD, U.S.A.; ; A satellite magnetic anomaly map made using the POGO magnetic field data is compared to three maps made using Magsat data. A total of 14 anomalies with magnitudes greater than 3 nT can be identified in all four of the maps poleward of 60°S latitude. Forward models of the Antarctic continental and oceanic lithosphere are produced which use magnetic crustal thickness based on seismic and heat flow data, and which also use the distribution of the Cretaceous Quiet Zone from marine geophysics. These simple models can explain significant parts of eight of the 14 identified anomalies. The remaining anomalies may be caused by lateral variations of magnetization, inadequate models of the magnetic crustal thickness, or remanent magnetizations in directions other than the present field. In addition, contamination of the magnetic anomaly maps by fields of time-varying external origin (and their corresponding internal parts) is still a significant problem in the Antarctic region.167 772 - PublicationRestrictedPreface to Tectonophysics, 347, 1-3 (2002)(2002-03-19)
; ; ; ;von Frese, R. R. B.; Department of Geological Sciences, The Ohio State University, Columbus, OH 43210, USA ;Taylor, P. T.; Geodynamics Branch, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA ;Chiappini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; Antarctica is the most poorly understood region of our planet. It, however, maintains an important geologic record of the Gondwana and Rodinia evolution and therefore is a center of extensive scientific inquiry. Magnetic data provide a critical window for geological studies due to the nearly ubiquitous snow and ice cover of this forbidding region. Consequently, numerous magnetic surveys have been carried out for site-specific geologic objectives since the International Geophysical Year 1957/1958. Plans for an international project to process and combine these disparate data sets into a single magnetic anomaly map were formulated at the 1993 meeting of the International Association of Geomagnetism and Aeronomy (IAGA) in Buenos Aires, Argentina. Both IAGA and the Scientific Committee on Antarctic Research (SCAR) passed resolutions of encouragement (Johnson et al., 1996; Chiappini et al., 1999). At a 1995 workshop at the British Antarctic Survey in Cambridge, UK, it became clear that these individual magnetic surveys could indeed be combined into a regional synthesis to further enhance their utility for geological studies (Johnson et al., 1996, 1997; Chiappini et al., 1998, 1999). Accordingly, the Antarctic Digital Magnetic Anomaly Project (ADMAP) was launched at this first workshop (ADMAP I) to compile and integrate into a digital database existing near-surface and satellite magnetic anomaly data of Antarctica and the surrounding oceans south of 60jS. An international working group of 32 scientists from eight countries that operate magnetic programs in the Antarctic was established. The working group adopted protocols for making existing and future magnetic data sets available to this international effort. In particular, existing Antarctic magnetic data holdings will be deposited in the world data centers by the end of this first phase of the project in 2002.153 23