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Articles 1 - 28 of 28
Full-Text Articles in Physical Sciences and Mathematics
Geophysical And Hydrological Evaluation Of Two Bog Complexes In A Northern Peatland: Implications For The Distribution Of Biogenic Gases At The Basin Scale, Xavier Comas, Lee Slater, Andrew S. Reeve
Geophysical And Hydrological Evaluation Of Two Bog Complexes In A Northern Peatland: Implications For The Distribution Of Biogenic Gases At The Basin Scale, Xavier Comas, Lee Slater, Andrew S. Reeve
Earth Science Faculty Scholarship
Ground penetrating radar (GPR) was used to determine peat basin geometry and the spatial distribution of free-phase biogenic gasses in two separate units of a northern peatland (Central and Southern Unit of Caribou Bog, Maine). The Central Unit is characterized by a deep basin structure (15 m maximum depth) and a raised (eccentric) bog topographic profile (up to 2 m topographic variation). Here numerous regions of electromagnetic (EM) wave scattering are considered diagnostic of the presence of extensive free-phase biogenic gas. In contrast, the Southern Unit is shallower (8 m maximum depth) and has a slightly convex upwards bog profile …
Icesat Measurements Reveal Complex Pattern Of Elevation Changes On Siple Coast Ice Streams, Antarctica, B. Csatho, Y. Ahn, T. Yoon, C. J. Van Der Veen, S. Vogel, Gordon S. Hamilton, D. Morse, B. Smith, V. Blue Spikes
Icesat Measurements Reveal Complex Pattern Of Elevation Changes On Siple Coast Ice Streams, Antarctica, B. Csatho, Y. Ahn, T. Yoon, C. J. Van Der Veen, S. Vogel, Gordon S. Hamilton, D. Morse, B. Smith, V. Blue Spikes
Earth Science Faculty Scholarship
We compare ICESat data (2003-2004) to airborne laser altimetry data (1997-98 and 1999-2000) to monitor surface changes over portions of Van der Veen (VdVIS), Whillans (WIS) and Kamb ice streams (KIS) in the Ross Embayment of the West Antarctic Ice Sheet. The spatial pattern of detected surface changes is generally consistent with earlier observations. However, important changes have occurred during the past decade. For example, areas on the VdVIS and WIS, where large thinning was detected by the airborne surveys, are now closer to being in balance. The upper trunk of KIS continues to build up with thickening rates reaching …
Us Itase Glaciochemistry, Paul Mayewski
Us Itase Glaciochemistry, Paul Mayewski
University of Maine Office of Research Administration: Grant Reports
The UMaine Continuous ice core Melter (UMCoM) system is a modified Wagenbach-style continuous melter system (Rothlisberger et al., 2000) with three important differences. First, we have constructed the melthead as two separate pieces, a base and a melter plate, so that it can be easily dismantled and cleaned between melting sessions. Second, the melter plate in contact with the ice is composed of pure nickel (>99.9% Ni) so that trace element measurements can be made from the meltwater stream. Third, in contrast to ice core melter systems in which the meltwater is directly channeled to online instruments for continuous …
Collaborative Research: Integrated Geophysical And Hydrogeologic Study Of A Large Maine Peatland, Andrew S. Reeve
Collaborative Research: Integrated Geophysical And Hydrogeologic Study Of A Large Maine Peatland, Andrew S. Reeve
University of Maine Office of Research Administration: Grant Reports
Solute transport controls vegetation and water chemistry gradients in peatlands. Dispersive mixing and advective transport in peat will be measured in laboratory column experiments and in a natural gradient tracer test in a peatland to determine the relative importance of these processes. We will assess the retardation of solutes by matrix diffusion and the applicability of a dual-domain model. Electrical geophysical methods, verified through direct measurements, will be used to track tracer migration.
An extensive geophysical and hydrogeologic characterization of the peatland will map variability in peat depth across the basin and identify stratigraphy. Ground-penetrating radar and resistivity/induced polarization imaging …
Glacial History Of The Amundsen Sea Shelf, Thomas B. Kellogg, Daniel Belknap, Davida Kellogg, Terence Hughes
Glacial History Of The Amundsen Sea Shelf, Thomas B. Kellogg, Daniel Belknap, Davida Kellogg, Terence Hughes
University of Maine Office of Research Administration: Grant Reports
This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a marine geological investigation of the Amundsen Sea region toward a better understanding of the deglaciation history of the West Antarctic Ice Sheet (WAIS). The WAIS may be inherently unstable because it is the last marine-based ice sheet in the world. Unlike other embayments in West Antarctica, major ice streams draining into the Amundsen Sea from the interior of the WAIS lack buttressing ice shelves. Mass balance data for the distal portions of these ice streams (Pine Island and Thwaites glaciers) appear to …
Barry Saltzman And The Theory Of Climate, Kirk A. Maasch, R. J. Oglesby, A. Fournier
Barry Saltzman And The Theory Of Climate, Kirk A. Maasch, R. J. Oglesby, A. Fournier
Earth Science Faculty Scholarship
Barry Saltzman was a giant in the fields of meteorology and climate science. A leading figure in the study of weather and climate for over 40 yr, he has frequently been referred to as the "father of modern climate theory." Ahead of his time in many ways, Saltzman made significant contributions to our understanding of the general circulation and spectral energetics budget of the atmosphere, as well as climate change across a wide spectrum of time scales. In his endeavor to develop a unified theory of how the climate system works, lie played a role in the development of energy …
Climatic And Lithogenic Controls On Soil Organic Matter-Mineral Associations, Rota Wagai
Climatic And Lithogenic Controls On Soil Organic Matter-Mineral Associations, Rota Wagai
Electronic Theses and Dissertations
Interactions of organic matter (OM) with soil mineral phases strongly affect the storage and dynamics of soil OM as well as other ecosystem processes. This study examined aspects of organo-mineral associations in soils at different scales. First, I assessed the potential controls of climate and parent rock type on organo-mineral associations using two sets of undisturbed tropical forest soils developed on two contrasting rocks along an altitudinal gradient in Borneo, Southeast Asia. Density fractionations showed that OM stored in surface mineral soils partitioned towards plant detritus fraction under cooler climates on both rock types. Thus climate exerted stronger control on …
Spatial Variability In Biogenic Gas Accumulations In Peat Soils Is Revealed By Ground Penetrating Radar (Gpr), Xavier Comas, Lee Slater, Andrew S. Reeve
Spatial Variability In Biogenic Gas Accumulations In Peat Soils Is Revealed By Ground Penetrating Radar (Gpr), Xavier Comas, Lee Slater, Andrew S. Reeve
Earth Science Faculty Scholarship
We performed surface and borehole ground penetrating radar (GPR) tests, together with moisture probe measurements and direct gas sampling to detect areas of biogenic gas accumulation in a northern peatland. The main findings are: (1) shadow zones (signal scattering) observed in surface GPR correlate with areas of elevated CH4 and CO2 concentration; (2) high velocities in zero offset profiles and lower water content inferred from moisture probes correlate with surface GPR shadow zones; (3) zero offset profiles depict depth variable gas accumulation from 0-10% by volume; (4) strong reflectors may represent confining layers restricting upward gas migration. Our results have …
Reply To Comment By Doran Et Al. On "El Nino Suppresses Antarctic Warming", Nancy A.N. Bertler, Peter J. Barrett, Paul Andrew Mayewski, Ryan L. Fogt, Karl J. Kreutz, James Shulmeister
Reply To Comment By Doran Et Al. On "El Nino Suppresses Antarctic Warming", Nancy A.N. Bertler, Peter J. Barrett, Paul Andrew Mayewski, Ryan L. Fogt, Karl J. Kreutz, James Shulmeister
Earth Science Faculty Scholarship
No abstract provided.
Controls On The Basal Water Pressure In Subglacial Channels Near The Margin Of The Greenland Ice Sheet, Andreas P. Ahlstrøm, Johan J. Mohr, Niels Reeh, Erik Lintz Christensen, Roger Hooke
Controls On The Basal Water Pressure In Subglacial Channels Near The Margin Of The Greenland Ice Sheet, Andreas P. Ahlstrøm, Johan J. Mohr, Niels Reeh, Erik Lintz Christensen, Roger Hooke
Earth Science Faculty Scholarship
Assuming a channelized drainage system in steady state, we investigate the influence of enhanced surface melting on the water pressure in subglacial channels, compared to that of changes in conduit geometry, ice rheology and catchment variations. The analysis is carried out for a specific part of the western Greenland ice-sheet margin between 66 degrees N and 66 degrees 30' N using new high-resolution digital elevation models of the subglacial topography and the ice-sheet surface, based on an airborne ice-penetrating radar survey in 2003 and satellite repeat-track interferometric synthetic aperture radar analysis of European Remote-sensing Satellite 1 and 2 (ERS-1/-2) imagery, …
Increasing Silicon Concentrations In Bohemian Forest Lakes, J. Veselý, V. Majer, J. Kopácek, J. Safanda, Stephen A. Norton
Increasing Silicon Concentrations In Bohemian Forest Lakes, J. Veselý, V. Majer, J. Kopácek, J. Safanda, Stephen A. Norton
Earth Science Faculty Scholarship
Long-term trends of dissolved silicon (Si) concentrations in five glacial lakes in the Bohemian Forest, Czech Republic, recovering from acidification show higher mobility of Si from the soil to surface waters despite lower atmospheric deposition of acids. Si increased by 0.95 to 1.95 mu mol yr(-1) (36 to 51%) from 1986-2004 and with increasing pH. A change in soil solution conditions because of a sharp decrease in acidic deposition has led to marked decline in Al mobility and to considerable decreases in dissolved Al, especially Al3+. The increase in Si may be related to: (1) unblocking of the inhibitory effect …
Lgm Summer Climate On The Southern Margin Of The Laurentide Ice Sheet: Wet Or Dry?, David H. Bromwich, E. Richard Toracinta, Robert J. Oglesby, James L. Fastook, Terence J. Hughes
Lgm Summer Climate On The Southern Margin Of The Laurentide Ice Sheet: Wet Or Dry?, David H. Bromwich, E. Richard Toracinta, Robert J. Oglesby, James L. Fastook, Terence J. Hughes
Earth Science Faculty Scholarship
Regional climate simulations are conducted using the Polar fifth-generation Pennsylvania State University (PSU)-NCAR Mesoscale Model (MM5) with a 60-km horizontal resolution domain over North America to explore the summer climate of the Last Glacial Maximum (LGM: 21 000 calendar years ago), when much of the continent was covered by the Laurentide Ice Sheet (LIS). Output from a tailored NCAR Community Climate Model version 3 (CCM3) simulation of the LGM climate is used to provide the initial and lateral boundary conditions for Polar MM5. LGM boundary conditions include continental ice sheets, appropriate orbital forcing, reduced CO2 concentration, paleovegetation, modified sea surface …
Stratigraphic Variation Within Polar Firn Caused By Differential Accumulation And Ice Flow: Interpretation Of A 400 Mhz Short-Pulse Radar Profile From West Antarctica, Steven A. Arcone, Vandy Blue Spikes, Gordon S. Hamilton
Stratigraphic Variation Within Polar Firn Caused By Differential Accumulation And Ice Flow: Interpretation Of A 400 Mhz Short-Pulse Radar Profile From West Antarctica, Steven A. Arcone, Vandy Blue Spikes, Gordon S. Hamilton
Earth Science Faculty Scholarship
We investigate causes of the stratigraphic variation revealed in a 177 km, 400 MHz short-pulse radar profile of firn from West Antarctica. The profile covers 56 m depth, and its direction was close to those of the ice flow and mean wind. The average, near-surface accumulation rates calculated from the time delays of one radar horizon consistently show minima on leeward slopes and maxima on windward slopes, confirming an earlier study based on stake observations. The stratigraphic variation includes up to 30 m depth variation in individual horizons over tens of km, fold limbs that become progressively steeper with depth, …
Stable-Isotope Time Series And Precipitation Origin From Firn-Core And Snow Samples, Altai Glaciers, Siberia, Vladimir B. Aizen, Elena M. Aizen, Koji Fujita, Stanislav A. Nikitin, Karl J. Kreutz, L. Nozomu Takeuchi
Stable-Isotope Time Series And Precipitation Origin From Firn-Core And Snow Samples, Altai Glaciers, Siberia, Vladimir B. Aizen, Elena M. Aizen, Koji Fujita, Stanislav A. Nikitin, Karl J. Kreutz, L. Nozomu Takeuchi
Earth Science Faculty Scholarship
In the summers of 2001 and 2002, glacio-climatological research was performed at 4110-4120 m a.s.l. on the Belukha snow/firn plateau, Siberian Altai. Hundreds of samples from snow pits and a 21 m snow/firn core were collected to establish the annual/seasonal/monthly depth-accumulation scale, based on stable-isotope records, stratigraphic analyses and meteorological and synoptic data. The fluctuations of water stable-isotope records show well-preserved seasonal variations. The delta(18)O and delta D relationships in precipitation, snow pits and the snow/firn core have the same slope to the covariance as that of the global meteoric water line. The origins of precipitation nourishing the Belukha plateau …
A New Velocity Map For Byrd Glacier, East Antarctica, From Sequential Aster Satellite Imagery, Leigh Stearns, Gordon Hamilton
A New Velocity Map For Byrd Glacier, East Antarctica, From Sequential Aster Satellite Imagery, Leigh Stearns, Gordon Hamilton
Earth Science Faculty Scholarship
New ice-velocity measurements are obtained for the main trunk of Byrd Glacier, East Antarctica, using recently acquired Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery. The velocities are derived from the application of a cross-correlation technique to sequential images acquired in 2000 and 2001. Images were co-registered and ortho-rectified with the aid of a digital elevation model (DEM) generated from ASTER stereo imagery. This paper outlines the process of DEM generation, image co-registration and correction, and the application of the cross-correlation technique to obtain ice velocities. Comparison of the new velocity map with earlier measurements of velocity from 1978 …
A 200 Year Sulfate Record From Sixteen Antarctic Ice Cores And Associations With Southern Ocean Sea-Ice Extent, D. Dixon, Paul Andrew Mayewski, S. Kaspari, Karl J. Kreutz, Gordon S. Hamilton, Kirk A. Maasch, Sharon B. Sneed, M. J. Handley
A 200 Year Sulfate Record From Sixteen Antarctic Ice Cores And Associations With Southern Ocean Sea-Ice Extent, D. Dixon, Paul Andrew Mayewski, S. Kaspari, Karl J. Kreutz, Gordon S. Hamilton, Kirk A. Maasch, Sharon B. Sneed, M. J. Handley
Earth Science Faculty Scholarship
Chemistry data from 16, 50-115 m deep, sub-annually dated ice cores are used to investigate spatial and temporal concentration variability of sea-salt (ss) SO42- and excess (xs) SO42- over West Antarctica and the South Pole for the last 200 years. Low-elevation ice-core sites in western West Antarctica contain higher concentrations Of SO42- as a result of cyclogenesis over the Ross Ice Shelf and proximity to the Ross Sea Polynya. Linear correlation analysis of 15 West Antarctic ice-core SO42- time series demonstrates that at several sites concentrations Of ssSO(4)(2-) are higher when sea-ice (SIE) extent is greater, and the inverse for …
An Ice-Core Proxy For Antarctic Circumpolar Zonal Wind Intensity, Yuping Yan, Paul Andrew Mayewski, Shichang Kang, Eric Meyerson
An Ice-Core Proxy For Antarctic Circumpolar Zonal Wind Intensity, Yuping Yan, Paul Andrew Mayewski, Shichang Kang, Eric Meyerson
Earth Science Faculty Scholarship
Using US National Centers for Environmental Prediction/US National Center for Atmospheric Research re-analysis data, we investigate the relationships between crustal ion (nssCa(2+)) concentrations from three West Antarctic ice cores, namely, Siple Dome (SD), ITASE00-1 (IT001) and ITASE01-5 (IT015), and primary components of the climate system, namely, air pressure/geopotential height, zonal (u) and meridional (v) wind strength. Linear correlation analyses between nssCa(2+) concentrations and both air-pressure and wind fields for the period of overlap between records indicate that the SD nssCa(2+) variation is positively correlated with spring circumpolar zonal wind, while IT001 nssCa(2+) has a positive correlation with circumpolar zonal wind …
Multi-Decadal Record Of Ice Dynamics On Daugaard Jensen Gletscher, East Greenland, From Satellite Imagery And Terrestrial Measurements, Leigh A. Stearns, Gordon S. Hamilton, Niels Reeh
Multi-Decadal Record Of Ice Dynamics On Daugaard Jensen Gletscher, East Greenland, From Satellite Imagery And Terrestrial Measurements, Leigh A. Stearns, Gordon S. Hamilton, Niels Reeh
Earth Science Faculty Scholarship
The history of ice velocity and calving front position of Daugaard Jensen Gletscher, a large outlet glacier in East Greenland, is reconstructed from field measurements, aerial photography and satellite imagery for the period 1950-2001. The calving terminus of the glacier has remained in approximately the same position over the past similar to 50 years. There is no evidence of a change in ice motion between 1968 and 2001, based on a comparison of velocities derived from terrestrial surveying and feature tracking using sequential satellite images. Estimates of flux near the entrance to the fjord vs snow accumulation in the interior …
Phase Structure Of Radar Stratigraphic Horizons Within Antarctic Firn, Steven A. Arcone, Vandy Blue Spikes, Gordon S. Hamilton
Phase Structure Of Radar Stratigraphic Horizons Within Antarctic Firn, Steven A. Arcone, Vandy Blue Spikes, Gordon S. Hamilton
Earth Science Faculty Scholarship
We have recorded reflection profiles of firn through large areas of West Antarctica and part of the East Antarctic plateau using 400 MHz short-pulse radar. The locations show accumulation rates that vary from well above to well below the vertical radar resolution. Most reflection horizons have extensive lateral continuity, and are composed of distinctive wavelets with a consistent phase polarity sequence within their successive half-cycles. We modeled these waveforms, and conclude that they arise from thin, double layers of ice over hoar, which is consistent with the standard model of firn stratification. In addition, we conclude that ice/hoar layers are …
High-Resolution Ice Cores From Us Itase (West Antarctica): Development And Validation Of Chronologies And Determination Of Precision And Accuracy, Eric J. Steig, Paul Andrew Mayewski, Daniel A. Dixon, Susan D. Kaspari, Markus M. Frey, David P. Schneider, Stephen A. Arcone, Gordon S. Hamilton, Vandy Blue Spikes, Mary Albert, Deb Meese, Anthony J. Gow, Christopher A. Shuman, James W.C. White, Sharon Sneed, Joseph Flaherty, Mark Wumkes
High-Resolution Ice Cores From Us Itase (West Antarctica): Development And Validation Of Chronologies And Determination Of Precision And Accuracy, Eric J. Steig, Paul Andrew Mayewski, Daniel A. Dixon, Susan D. Kaspari, Markus M. Frey, David P. Schneider, Stephen A. Arcone, Gordon S. Hamilton, Vandy Blue Spikes, Mary Albert, Deb Meese, Anthony J. Gow, Christopher A. Shuman, James W.C. White, Sharon Sneed, Joseph Flaherty, Mark Wumkes
Earth Science Faculty Scholarship
Shallow ice cores were obtained from widely distributed sites across the West Antarctic ice sheet, as part of the United States portion of the International Trans-Antarctic Scientific Expedition (US ITASE) program. The US ITASE cores have been dated by annual-layer counting, primarily through the identification of summer peaks in non-sea-salt sulfate (nssSO(4)(2-)) concentration. Absolute dating accuracy of better than 2 years and relative dating accuracy better than 1 year is demonstrated by the identification of multiple volcanic marker horizons in each of the cores, Tambora, Indonesia (1815), being the most prominent. Independent validation is provided by the tracing of isochronal …
Solar Forcing Recorded By Aerosol Concentrations In Coastal Antarctic Glacier Ice, Mcmurdo Dry Valleys, Nancy A.N. Bertler, Paul Andrew Mayewski, Sharon B. Sneed, Tim R. Naish, Uwe Morgenstern, Peter J. Barrett
Solar Forcing Recorded By Aerosol Concentrations In Coastal Antarctic Glacier Ice, Mcmurdo Dry Valleys, Nancy A.N. Bertler, Paul Andrew Mayewski, Sharon B. Sneed, Tim R. Naish, Uwe Morgenstern, Peter J. Barrett
Earth Science Faculty Scholarship
Ice-core chemistry data from Victoria Lower Glacier, Antarctica, suggest, at least for the last 50 years, a direct influence of solar activity variations on the McMurdo Dry Valleys (MDV) climate system via controls on air-mass input from two competing environments: the East Antarctic ice sheet and the Ross Sea. During periods of increased solar activity, when total solar irradiance is relatively high, the MDV climate system appears to be dominated by air masses originating from the Ross Sea, leading to higher aerosol deposition. During reduced solar activity, the Antarctic interior seems to be the dominant air-mass source, leading to lower …
Spatial Patterns In Mass Balance Of The Siple Coast And Amundsen Sea Sectors, West Antarctica, Gordon S. Hamilton, V. Blue Spikes, Leigh A. Stearns
Spatial Patterns In Mass Balance Of The Siple Coast And Amundsen Sea Sectors, West Antarctica, Gordon S. Hamilton, V. Blue Spikes, Leigh A. Stearns
Earth Science Faculty Scholarship
Local rates of change in ice-sheet thickness were calculated at IS sites in West Antarctica using the submergence velocity technique. This method entails a comparison of the vertical velocity of the ice sheet, measured using repeat global positioning system surveys of markers, and local long-term rates of snow accumulation obtained using firn-core stratigraphy. Any significant difference between these two quantities represents a thickness change with time. Measurements were conducted at sites located similar to 100-200 km apart along US ITASE traverse routes, and at several isolated locations. All but one of the sites are distributed in the Siple Coast and …
Solar Forcing Of The Polar Atmosphere, Paul Andrew Mayewski, Kirk A. Maasch, Yuping Yan, Shichang Kang, Eric A. Meyerson, Sharon B. Sneed, Susan D. Kaspari, Daniel A. Dixon, Erich C. Osterberg, Vin I. Morgan, Tas Van Ommen, Mark A.J. Curran
Solar Forcing Of The Polar Atmosphere, Paul Andrew Mayewski, Kirk A. Maasch, Yuping Yan, Shichang Kang, Eric A. Meyerson, Sharon B. Sneed, Susan D. Kaspari, Daniel A. Dixon, Erich C. Osterberg, Vin I. Morgan, Tas Van Ommen, Mark A.J. Curran
Earth Science Faculty Scholarship
We present highly resolved, annually dated, calibrated proxies for atmospheric circulation from several Antarctic ice cores (ITASE (International Trans-Antarctic Scientific Expedition), Siple Dome, Law Dome) that reveal decadal-scale associations with a South Pole ice-core Be-10 proxy for solar variability over the last 600 years and annual-scale associations with solar variability since AD 1720. We show that increased (decreased) solar irradiance is associated with increased (decreased) zonal wind strength near the edge of the Antarctic polar vortex. The association is particularly strong in the Indian and Pacific Oceans and as such may contribute to understanding climate forcing that controls drought in …
The International Trans-Antarctic Scientific Expedition (Itase): An Overview, Paul Andrew Mayewski, Massimo Frezzotti, Nancy A.N. Bertler, Tas Van Ommen, Gordon S. Hamilton, Tim H. Jacka, Brian Welch, Markus Frey, Dahe Qin, Jiawen Ren, Jefferson Simöes, Michel Fily, Hans Oerter, Fumihiko Nishio, Elisabeth Isaksson, Robert Mulvaney, Per Holmund, Volodya Lipenkov, Ian Goodwin
The International Trans-Antarctic Scientific Expedition (Itase): An Overview, Paul Andrew Mayewski, Massimo Frezzotti, Nancy A.N. Bertler, Tas Van Ommen, Gordon S. Hamilton, Tim H. Jacka, Brian Welch, Markus Frey, Dahe Qin, Jiawen Ren, Jefferson Simöes, Michel Fily, Hans Oerter, Fumihiko Nishio, Elisabeth Isaksson, Robert Mulvaney, Per Holmund, Volodya Lipenkov, Ian Goodwin
Earth Science Faculty Scholarship
From its original formulation in 1990 the International Trans-Antarctic Scientific Expedition (ITASE) has had as its primary aim the collection and interpretation of a continent-wide array of environmental parameters assembled through the coordinated efforts of scientists from several nations. ITASE offers the ground-based opportunities of traditional-style traverse travel coupled with the modern technology of CPS, crevasse detecting radar, satellite communications and multidisciplinary research. By operating predominantly in the mode of an oversnow traverse, ITASE offers scientists the opportunity to experience the dynamic range of the Antarctic environment. ITASE also offers an important interactive venue for research similar to that afforded …
Snow Chemistry Across Antarctica, Nancy Bertler, Paul Andrew Mayewski, Alberto Aristarain, P. Barrett, S. Becagli, Ronaldo Torma Bernardo, Xiao Cunde, M. Curran, Qin Dahe, Daniel Dixon, Francisco Adolfo Ferron, H. Fischer, Markus Frey, M. Frezzotti, F. Fundel, Christophe Genthon, R. Gragani, Gordon Hamilton, M. Handley, Sungmin Hong, E. Isaksson, Ren Jiawen, Kokichi Kamiyama, Satoru Kanamori, Eija Karkas, L. Karlöf, S. Kaspari, K. Kreutz, A. Kurbatov, E. Meyerson, Hideaki Motoyama, R. Mulvaney, Zhang Mingjun, H. Oerter, E. Osterberg, M. Proposito, A. Pyne, U. Ruth, Jefferson Cardia Simoes, B. Smith, S. Sneed, Kimmo Teinila, F. Traufetter, R. Udisti, Aki Virkkula, Okitsugu Watanabe, B. Williamson, E. Wolff, Li Zhongqin
Snow Chemistry Across Antarctica, Nancy Bertler, Paul Andrew Mayewski, Alberto Aristarain, P. Barrett, S. Becagli, Ronaldo Torma Bernardo, Xiao Cunde, M. Curran, Qin Dahe, Daniel Dixon, Francisco Adolfo Ferron, H. Fischer, Markus Frey, M. Frezzotti, F. Fundel, Christophe Genthon, R. Gragani, Gordon Hamilton, M. Handley, Sungmin Hong, E. Isaksson, Ren Jiawen, Kokichi Kamiyama, Satoru Kanamori, Eija Karkas, L. Karlöf, S. Kaspari, K. Kreutz, A. Kurbatov, E. Meyerson, Hideaki Motoyama, R. Mulvaney, Zhang Mingjun, H. Oerter, E. Osterberg, M. Proposito, A. Pyne, U. Ruth, Jefferson Cardia Simoes, B. Smith, S. Sneed, Kimmo Teinila, F. Traufetter, R. Udisti, Aki Virkkula, Okitsugu Watanabe, B. Williamson, E. Wolff, Li Zhongqin
Earth Science Faculty Scholarship
An updated compilation of published and new data of major-ion (Ca, Cl, K, Mg, Na, NO3, SO4) and methylsulfonate (MS) concentrations in snow from 520 Antarctic sites is provided by the national ITASE (International Trans-Antarctic Scientific Expedition) programmes of Australia, Brazil, China, Germany, Italy, Japan, Korea, New Zealand, Norway, the United Kingdom, the United States and the national Antarctic programme of Finland. The comparison shows that snow chemistry concentrations vary by up to four orders of magnitude across Antarctica and exhibit distinct geographical patterns. The Antarctic-wide comparison of glaciochemical records provides a unique opportunity to improve …
The International Trans-Arctic Scientific Expedition (Itase): An Overview, Paul Andrew Mayewski, Massimo Frezzotti, Nancy Bertler, Tas Van Ommen, Gordon S. Hamilton, Tim H. Jacka, Brian Welch, Markus Frey, Dahe Qin, Jiawen Ren, Jefferson Simões, Michel Fily, Hans Oerter, Fumihiko Nishio, Elisabeth Isaksson, Robert Mulvaney, Per Holmund, Volodya Lipenkov, Ian Goodwin
The International Trans-Arctic Scientific Expedition (Itase): An Overview, Paul Andrew Mayewski, Massimo Frezzotti, Nancy Bertler, Tas Van Ommen, Gordon S. Hamilton, Tim H. Jacka, Brian Welch, Markus Frey, Dahe Qin, Jiawen Ren, Jefferson Simões, Michel Fily, Hans Oerter, Fumihiko Nishio, Elisabeth Isaksson, Robert Mulvaney, Per Holmund, Volodya Lipenkov, Ian Goodwin
Earth Science Faculty Scholarship
From its original formulation in 1990 the International Trans-Antarctic Scientific Expedition (ITASE) has had as its primary aim the collection and interpretation of a continent-wide array of environmental parameters assembled through the coordinated efforts of scientists from several nations. ITASE offers the ground-based opportunities of traditional-style traverse travel coupled with the modern technology of GPS, crevasse detecting radar, satellite communications and multidisciplinary research. By operating predominantly in the mode of an oversnow traverse, ITASE offers scientists the opportunity to experience the dynamic range of the Antarctic environment. ITASE also offers an important interactive venue for research similar to that afforded …
Early Paleozoic Orogenesis In The Maine-Quebec Appalachians, Christopher Charles Gerbi
Early Paleozoic Orogenesis In The Maine-Quebec Appalachians, Christopher Charles Gerbi
Electronic Theses and Dissertations
Accretionary orogens, such as the Appalachian orogen, form by episodic docking of oceanic and continental fragments. Two factors that exert significant control on the development of an accretionary orogen are: (1) the nature and source of the accreting fragments, and (2) the thermal and deformational structure of the crust. This study addresses aspects of both of these controls. In the Northern Appalachians, a long-lived but untested hypothesis suggested that Early Paleozoic accretion in western Maine, which marked the initiation of Appalachian development, involved the docking of an island arc. My goal was to test this hypothesis for the Maine-Qukbec segment …
Porphyroblast Kinematics And Crenulation Cleavage Development In The Aureole Of The Mooselookmeguntic Pluton, Western Maine, Matthew E. Dupee
Porphyroblast Kinematics And Crenulation Cleavage Development In The Aureole Of The Mooselookmeguntic Pluton, Western Maine, Matthew E. Dupee
Electronic Theses and Dissertations
The porphyroblastic pelitic schists of western Maine are ideal for studying the deformation and metamorphism that accompanies pluton emplacement. A regional lowpressure, high-temperature metamorphic event affected the areally extensive Silurian sediments with the thermal peak occuning ca. 404 Ma. This metamorphism produced the widespread assemblage staurolite + andalusite + biotite +I- garnet, and occurred during the late stages of development of a northeast-trending, steeply-dipping axial-surface foliation. A period of extensive plutonism accompanied and followed this Acadian-aged deformation and metamorphism. This study focuses specifically on the contact aureole of the Mooselookmeguntic pluton emplaced ca. 370 Ma. Contact metamorphism accompanied the development …