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Full-Text Articles in Physical Sciences and Mathematics
Surface Mass Balance Of The Ward Hunt Ice Rise And Ward Hunt Ice Shelf, Ellesmere Island, Nunavut, Canada, C. Braun, D. R. Hardy, Raymond S. Bradley, V. Sahanatien
Surface Mass Balance Of The Ward Hunt Ice Rise And Ward Hunt Ice Shelf, Ellesmere Island, Nunavut, Canada, C. Braun, D. R. Hardy, Raymond S. Bradley, V. Sahanatien
Raymond S Bradley
The Ward Hunt Ice Rise and Ward Hunt Ice Shelf, located on Ellesmere Island, Canada, are two of the northernmost land ice masses on the North American continent. Surface mass balance measurements (excluding calving and subice processes) began in 1959 on the ice rise and in 1966 on the ice shelf but were frequently interrupted, most recently between 1986 and 2002. The surface balance of the ice rise and ice shelf follows the temporal pattern seen on other measured High Arctic glaciers. The overall surface mass losses over the last 45 years have been comparatively low (1.68 m water equivalent …
Modern Glacier Retreat On Kilimanjaro As Evidence Of Climate Change: Observations And Facts, Georg Kaser, Douglas R. Hardy, Thomas Molg, Raymond S. Bradley, Tharsis M. Hyera
Modern Glacier Retreat On Kilimanjaro As Evidence Of Climate Change: Observations And Facts, Georg Kaser, Douglas R. Hardy, Thomas Molg, Raymond S. Bradley, Tharsis M. Hyera
Raymond S Bradley
In recent years, Kilimanjaro and its vanishing glaciers have become an ‘icon’ of global warming, attracting broad interest. In this paper, a synopsis of (a) field observations made by the authors and (b) climatic data as reported in the literature (proxy and long-term instrumental data) is presented to develop a new concept for investigating the retreat of Kilimanjaro’s glaciers, based on the physical understanding of glacier–climate interactions. The concept considers the peculiarities of the mountain and implies that climatological processes other than air temperature control the ice recession in a direct manner. A drastic drop in atmospheric moisture at the …
Weather And Climate, Rob Snyder
Weather And Climate, Rob Snyder
Science and Engineering Saturday Seminars
No abstract provided.
The Relationship Between Exsolution And Magnetic Properties In Hemo-Ilmenite: Insights From Mössbauer Spectroscopy With Implications For Planetary Magnetic Anomalies, Laurie Brown, M. D. Dyar, S. A. Mcenroe, E. Murad, H. Schiellerup
The Relationship Between Exsolution And Magnetic Properties In Hemo-Ilmenite: Insights From Mössbauer Spectroscopy With Implications For Planetary Magnetic Anomalies, Laurie Brown, M. D. Dyar, S. A. Mcenroe, E. Murad, H. Schiellerup
Laurie Brown
Remanence properties of ilmenites with exsolved hematite have recently been the object of much study, because their high natural remanent magnetization (NRM) is greater than predicted for these two minerals. X-ray diffraction (XRD) and Mössbauer spectroscopy in conjunction with electron microprobe and NRM measurements were used to explore the possibility that single domain (SD) hematite lamellae in the ilmenite host could explain the observed remanence, and to determine if magnetite is present. XRD results show the presence of ilmenite and hematite. Mössbauer data show that only species assigned to hematite, ilmenite, and a small amount of tetrahedral Fe3+ are present. …
Paleomagnetic Directions And 40ar/39ar Ages From The Tatara-San Pedro Volcanic Complex, Chilean Andes: Lava Record Of A Matuyama-Brunhes Precursor?, Laurie Brown, J. C. Pickens, B. S. Singer, B. R. Jicha
Paleomagnetic Directions And 40ar/39ar Ages From The Tatara-San Pedro Volcanic Complex, Chilean Andes: Lava Record Of A Matuyama-Brunhes Precursor?, Laurie Brown, J. C. Pickens, B. S. Singer, B. R. Jicha
Laurie Brown
Lava flows within Quebrada Turbia valley of the Tatara San Pedro volcanic complex, in central Chile (36°S, 289°E), preserve a detailed record of what was presumed to be the Matuyama-Brunhes geomagnetic reversal. A sampling traverse in the central west wall of the valley yields reverse and transitional polarity flows of the Quebrada Turbia sequence. Two kilometers to the north, another section yields 17 transitional flows from the same volcanic sequence overlain by flows with normal polarity. The 40Ar/39Ar incremental heating experiments on lavas within the two sections provide nine independent age determinations and yield a weighted mean of 791.7 ± …
Projected Temperature Changes Along The American Cordillera And The Planned Gcos Network, Raymond S. Bradley, F. T. Keimig, H. F. Diaz
Projected Temperature Changes Along The American Cordillera And The Planned Gcos Network, Raymond S. Bradley, F. T. Keimig, H. F. Diaz
Raymond S Bradley
Analysis of 7 GCM simulations with 2x CO2 levels shows large and statistically significant free air temperature changes (compared to controls) along the axis of the American Cordillera (from Alaska to southern Chile). At all latitudes, the modeled change in temperature increases with elevation. Temperature increases are especially large in boreal summer months from ∼35–50°N, and year-round in the high mountains of Peru, Bolivia and northern Chile. If these models are correct, mountain ranges that extend high into the lower troposphere are likely to experience significant warming, with implications for glacier mass balance and water resources, montane ecosystems and high …
Magnetic Anomalies, Layered Intrusions And Mars, Laurie Brown, S. A. Mcenroe, J. R. Skilbrei, P. Robinson, F. Heidelbach, F. Langenhorst
Magnetic Anomalies, Layered Intrusions And Mars, Laurie Brown, S. A. Mcenroe, J. R. Skilbrei, P. Robinson, F. Heidelbach, F. Langenhorst
Laurie Brown
Studies of remanence-controlled magnetic anomalies on Earth provide possibilities to interpret the nature of crustal rocks that cause the large remanent anomalies on Mars. What types of conditions on Earth can create large remanent magnetic anomalies? Such an anomaly, extending for 20 km centered over a norite layer in the Bjerkreim-Sokndal (BKS) Intrusion, shows a minimum −13000 nT below background in the helicopter survey. Modeling of the anomaly requires a natural remanent magnetization (NRM) value of 24 A/m, similar to values measured in norite samples and to values invoked to explain the anomalies on Mars. Preliminary magnetic assessment considers the …
A 1500-Year El Niño/Southern Oscillation And Rainfall History For The Isthmus Of Panama From Speleothem Calcite, Stephen J. Burns, M. S. Lachniet, D. R. Piperno, Y. Asmerom, V. J. Polyak, C. M. Moy, K. Christenson
A 1500-Year El Niño/Southern Oscillation And Rainfall History For The Isthmus Of Panama From Speleothem Calcite, Stephen J. Burns, M. S. Lachniet, D. R. Piperno, Y. Asmerom, V. J. Polyak, C. M. Moy, K. Christenson
Stephen J Burns
The effect of the El Niño/Southern Oscillation (ENSO) on tropical rainfall variations of the past 2 millennia is largely unknown. High-resolution monsoon records are sparse, despite the role of ENSO in generating global hydrologic anomalies in modern climate. To investigate the relationship between ENSO and the Central American Monsoon, we generated a high-resolution (∼2.9 years/sample) oxygen-isotope monsoon rainfall record from a U/Th-dated stalagmite (180 B.C. to 1310 A.D.) from the Isthmus of Panama. We present evidence for a weakened monsoon during the “High Medieval” (1100–1200 A.D.) and the Classic Maya Collapse (750–950 A.D.). Rainfall decreased and was more variable after …
Proton Source Size Measurements In The Ea -> E(')Ppx Reaction, Av Stavinsky, Kr Mikhailov, R Lednicky, Av Vlassov, G Adams, P Ambrozewich, E Anciant, M Anghinolfi, B Asavapibhop, G Asryan, G Audit, T Auger, H Avakian, H Bagdasaryan, Jp Ball, S Barrow, V Batourine, M Battaglieri, K Beard, M Bektasoglu, M Bellis, N Benmouna, N Bianchi, As Biselli, S Boiarinov, Be Bonner, S Bouchigny, R Bradford, D Branford, Wk Brooks, Vd Burkert, C Butuceanu, Jr Calarco, Ds Carman, C Cetina, S Chen, Pl Cole, D Cords, A Coleman, P Corvisiero, D Crabb, Jp Cummings, N Dashyan, Ed Sanctis, Rd Vita, Pv Degtyarenko, H Denizli, L Dennis, A Deur, Kv Dharmawardane, C Djalali, Ge Dodge, D Doughty, P Dragovitsch, M Dugger, S Dytman, Op Dzyubak, H Egiyan, Ks Egiyan, L Elouadrhiri, A Empl, P Eugenio, R Fatemi, Rg Fersch, Rj Feuerbach, Ta Forest, H Funsten, M Garcon, G Gavalian, S Gilad, Gp Gilfoyle, Kl Giovanetti, P Girard, Cio Gordon, Rw Gothe, K Griffioen, M Guidal, M Guillo, N Guler, L Guo, V Gyurjyan, C Hadjidakis, Rs Hakobyan, J Hardie, D Heddle, Fw Hersman, K Hicks, I Hleiqawi, M Holtrop, J Hu, Ce Hyde-Wright, Dg Ireland, Mm Ito, D Jenkins, K Joo, Hg Juengst, Jh Kelley, Jd Kellie, M Khandaker, Dh Kim, Ky Kim, K Kim, Ms Kim, W Kim, A Klein, Fj Klein, Av Klimenko, M Klusman, Mv Kossov, Lh Kramer, V Kubarovski, Se Kuhn, J Kuhn, J Lachniet, Jm Laget, J Langheinrich, D Lawrence, Ga Leksin, T Lee, J Li, K Livingston, K Lukashin, Jj Manak, C Marchand, S Mcaleer, Jwc Mcnabb, Ba Mecking, S Mehrabyan, Jj Melone, Md Mestayer, Ca Meyer, M Mirazita, R Miskimen, V Mokeev, L Morand, Sa Morrow, V Muccifora, J Mueller, Gs Mutchler, J Napolitano, R Nasseripour, So Nelson, S Niccolai, G Niculescu, I Niculescu, Bb Niczyporuk, Ra Niyazov, M Nozar, Gv O'Rielly, M Osipenko, Ai Ostrovidov, K Park, E Pasyuk, G Peterson, Sa Philips, Na Pivnyuk, D Pocanic, O Pogorelko, E Polli, S Pozdniakov, Bm Preedom, Jw Price, Y Prok, D Protopopescu, Lm Qin, Ba Raue, G Riccardi, G Ricco, M Ripani, Bg Ritchie, F Ronchetti, G Rosner, P Rossi, D Rowntree, Pd Rubin, F Sabatie, K Sabourov, C Salgado, Jp Santoro, V Sapunenko, Ra Schumacher, Vs Serov, Yg Sharabian, J Shaw, S Simionatto, Av Skabelin, Es Smith, Lc Smith, Di Sober, M Spraker, S Stepanyan, Ss Stepanyan, Be Stokes, P Stoler, Ii Strakovsky, M Taiuti, S Taylor, Dj Tedeschi, U Thoma, R Thompson, A Tkabladze, L Todor, C Tur, M Ungaro, Mf Vineyard, Ls Vorobeyev, K Wang, Lb Weinstein, H Weller, Dp Weygand, Cs Whisnant, M Williams, E Wolin, Mh Wood, A Yegneswaran, J Yun, L Zana
Proton Source Size Measurements In The Ea -> E(')Ppx Reaction, Av Stavinsky, Kr Mikhailov, R Lednicky, Av Vlassov, G Adams, P Ambrozewich, E Anciant, M Anghinolfi, B Asavapibhop, G Asryan, G Audit, T Auger, H Avakian, H Bagdasaryan, Jp Ball, S Barrow, V Batourine, M Battaglieri, K Beard, M Bektasoglu, M Bellis, N Benmouna, N Bianchi, As Biselli, S Boiarinov, Be Bonner, S Bouchigny, R Bradford, D Branford, Wk Brooks, Vd Burkert, C Butuceanu, Jr Calarco, Ds Carman, C Cetina, S Chen, Pl Cole, D Cords, A Coleman, P Corvisiero, D Crabb, Jp Cummings, N Dashyan, Ed Sanctis, Rd Vita, Pv Degtyarenko, H Denizli, L Dennis, A Deur, Kv Dharmawardane, C Djalali, Ge Dodge, D Doughty, P Dragovitsch, M Dugger, S Dytman, Op Dzyubak, H Egiyan, Ks Egiyan, L Elouadrhiri, A Empl, P Eugenio, R Fatemi, Rg Fersch, Rj Feuerbach, Ta Forest, H Funsten, M Garcon, G Gavalian, S Gilad, Gp Gilfoyle, Kl Giovanetti, P Girard, Cio Gordon, Rw Gothe, K Griffioen, M Guidal, M Guillo, N Guler, L Guo, V Gyurjyan, C Hadjidakis, Rs Hakobyan, J Hardie, D Heddle, Fw Hersman, K Hicks, I Hleiqawi, M Holtrop, J Hu, Ce Hyde-Wright, Dg Ireland, Mm Ito, D Jenkins, K Joo, Hg Juengst, Jh Kelley, Jd Kellie, M Khandaker, Dh Kim, Ky Kim, K Kim, Ms Kim, W Kim, A Klein, Fj Klein, Av Klimenko, M Klusman, Mv Kossov, Lh Kramer, V Kubarovski, Se Kuhn, J Kuhn, J Lachniet, Jm Laget, J Langheinrich, D Lawrence, Ga Leksin, T Lee, J Li, K Livingston, K Lukashin, Jj Manak, C Marchand, S Mcaleer, Jwc Mcnabb, Ba Mecking, S Mehrabyan, Jj Melone, Md Mestayer, Ca Meyer, M Mirazita, R Miskimen, V Mokeev, L Morand, Sa Morrow, V Muccifora, J Mueller, Gs Mutchler, J Napolitano, R Nasseripour, So Nelson, S Niccolai, G Niculescu, I Niculescu, Bb Niczyporuk, Ra Niyazov, M Nozar, Gv O'Rielly, M Osipenko, Ai Ostrovidov, K Park, E Pasyuk, G Peterson, Sa Philips, Na Pivnyuk, D Pocanic, O Pogorelko, E Polli, S Pozdniakov, Bm Preedom, Jw Price, Y Prok, D Protopopescu, Lm Qin, Ba Raue, G Riccardi, G Ricco, M Ripani, Bg Ritchie, F Ronchetti, G Rosner, P Rossi, D Rowntree, Pd Rubin, F Sabatie, K Sabourov, C Salgado, Jp Santoro, V Sapunenko, Ra Schumacher, Vs Serov, Yg Sharabian, J Shaw, S Simionatto, Av Skabelin, Es Smith, Lc Smith, Di Sober, M Spraker, S Stepanyan, Ss Stepanyan, Be Stokes, P Stoler, Ii Strakovsky, M Taiuti, S Taylor, Dj Tedeschi, U Thoma, R Thompson, A Tkabladze, L Todor, C Tur, M Ungaro, Mf Vineyard, Ls Vorobeyev, K Wang, Lb Weinstein, H Weller, Dp Weygand, Cs Whisnant, M Williams, E Wolin, Mh Wood, A Yegneswaran, J Yun, L Zana
Michael Williams
Two-proton correlations at small relative momentum q were studied in the eA(3He,4He,C,Fe)-->e(')ppX reaction at E(0)=4.46 GeV using the CLAS detector at Jefferson Lab. The enhancement of the correlation function at small q was found to be in accordance with theoretical expectations. Sizes of the emission region were extracted, and proved to be dependent on A and on the proton momentum. The size of the two-proton emission region for He was measured in eA reactions for the first time.
Complete Measurement Of Three-Body Photodisintegration Of He-3 For Photon Energies Between 0.35 And 1.55 Gev, S Niccolai, G Audit, Bl Berman, Jm Laget, S Strauch, G Adams, A Afanasev, P Ambrozewicz, M Anghinolfi, Jrm Annand, C Armstrong, B Asavapibhop, H Avakian, H Bagdasaryan, Jp Ball, S Barrow, M Battaglieri, K Beard, M Bektasoglu, M Bellis, N Benmouna, N Bianchi, As Biselli, S Boiarinov, Be Bonner, S Bouchigny, R Bradford, D Branford, Wj Briscoe, Wk Brooks, Vd Burkert, C Butuceanu, Jr Calarco, Ds Carman, B Carnahan, S Chen, Pl Cole, A Coleman, D Cords, P Corvisiero, D Crabb, H Crannell, Jp Cummings, E De Sanctis, R Devita, Pv Degtyarenko, H Denizli, L Dennis, Kv Dharmawardane, Ks Dhuga, C Djalali, Ge Dodge, D Doughty, P Dragovitsch, M Dugger, S Dytman, Op Dzyubak, H Egiyan, Ks Egiyan, L Elouadrhiri, A Empl, R Ent, P Eugenio, R Fatemi, G Fedotov, G Feldman, Rj Feuerbach, J Ficenec, Ta Forest, H Funsten, G Gavalian, Gp Gilfoyle, Kl Giovanetti, E Golovatch, Cio Gordon, Rw Gothe, K Griffioen, M Guidal, M Guillo, N Guler, L Guo, V Gyurjyan, C Hadjidakis, Rs Hakobyan, J Hardie, D Heddle, P Heimberg, Fw Hersman, K Hicks, K Hleiqawi, M Holtrop, J Hu, M Huertas, Ce Hyde-Wright, Yy Ilieva, D Ireland, Mm Ito, D Jenkins, Hs Jo, K Joo, Hg Juengst, J Kellie, M Khandaker, Ky Kim, K Kim, W Kim, A Klein, Fj Klein, Av Klimenko, M Klusman, M Kossov, Lh Kramer, Y Kuang, Se Kuhn, J Kuhn, J Lachniet, J Langheinrich, D Lawrence, J Li, Acs Lima, K Livingston, K Lukashin, Jj Manak, C Marchand, S Mcaleer, Jwc Mcnabb, Ba Mecking, Jj Melone, Md Mestayer, Ca Meyer, K Mikhailov, R Minehart, M Mirazita, R Miskimen, L Morand, Sa Morrow, V Muccifora, J Mueller, Ly Murphy, Gs Mutchler, J Napolitano, R Naseripour, G Niculescu, I Niculescu, Bb Niczyporuk, Ra Niyazov, M Nozar, Jt O'Brien, Gv O'Rielly, M Osipenko, A Ostrovidov, K Park, E Pasyuk, Sa Philips, N Pivnyuk, D Pocanic, O Pogorelko, E Polli, I Popa, S Pozdniakov, Bm Preedom, Jw Price, Y Prok, D Protopopescu, Lm Qin, Ba Raue, G Riccardi, G Ricco, M Ripani, Bg Ritchie, F Ronchetti, G Rosner, P Rossi, D Rowntree, Pd Rubin, F Sabatie, C Salgado, Jp Santoro, V Sapunenko, Ra Schumacher, Vs Serov, A Shafi, Yg Sharabian, J Shaw, Av Skabelin, Es Smith, Lc Smith, Di Sober, A Stavinsky, S Stepanyan, P Stoler, Ii Strakovsky, R Suleiman, M Taiuti, S Taylor, Dj Tedeschi, U Thoma, R Thompson, R Tkabladze, L Todor, C Tur, M Ungaro, Mf Vineyard, Av Vlassov, K Wang, Lb Weinstein, Dp Weygand, Cs Whisnant, M Williams, E Wolin, Mh Wood, A Yegneswaran, J Yun, L Zana
Complete Measurement Of Three-Body Photodisintegration Of He-3 For Photon Energies Between 0.35 And 1.55 Gev, S Niccolai, G Audit, Bl Berman, Jm Laget, S Strauch, G Adams, A Afanasev, P Ambrozewicz, M Anghinolfi, Jrm Annand, C Armstrong, B Asavapibhop, H Avakian, H Bagdasaryan, Jp Ball, S Barrow, M Battaglieri, K Beard, M Bektasoglu, M Bellis, N Benmouna, N Bianchi, As Biselli, S Boiarinov, Be Bonner, S Bouchigny, R Bradford, D Branford, Wj Briscoe, Wk Brooks, Vd Burkert, C Butuceanu, Jr Calarco, Ds Carman, B Carnahan, S Chen, Pl Cole, A Coleman, D Cords, P Corvisiero, D Crabb, H Crannell, Jp Cummings, E De Sanctis, R Devita, Pv Degtyarenko, H Denizli, L Dennis, Kv Dharmawardane, Ks Dhuga, C Djalali, Ge Dodge, D Doughty, P Dragovitsch, M Dugger, S Dytman, Op Dzyubak, H Egiyan, Ks Egiyan, L Elouadrhiri, A Empl, R Ent, P Eugenio, R Fatemi, G Fedotov, G Feldman, Rj Feuerbach, J Ficenec, Ta Forest, H Funsten, G Gavalian, Gp Gilfoyle, Kl Giovanetti, E Golovatch, Cio Gordon, Rw Gothe, K Griffioen, M Guidal, M Guillo, N Guler, L Guo, V Gyurjyan, C Hadjidakis, Rs Hakobyan, J Hardie, D Heddle, P Heimberg, Fw Hersman, K Hicks, K Hleiqawi, M Holtrop, J Hu, M Huertas, Ce Hyde-Wright, Yy Ilieva, D Ireland, Mm Ito, D Jenkins, Hs Jo, K Joo, Hg Juengst, J Kellie, M Khandaker, Ky Kim, K Kim, W Kim, A Klein, Fj Klein, Av Klimenko, M Klusman, M Kossov, Lh Kramer, Y Kuang, Se Kuhn, J Kuhn, J Lachniet, J Langheinrich, D Lawrence, J Li, Acs Lima, K Livingston, K Lukashin, Jj Manak, C Marchand, S Mcaleer, Jwc Mcnabb, Ba Mecking, Jj Melone, Md Mestayer, Ca Meyer, K Mikhailov, R Minehart, M Mirazita, R Miskimen, L Morand, Sa Morrow, V Muccifora, J Mueller, Ly Murphy, Gs Mutchler, J Napolitano, R Naseripour, G Niculescu, I Niculescu, Bb Niczyporuk, Ra Niyazov, M Nozar, Jt O'Brien, Gv O'Rielly, M Osipenko, A Ostrovidov, K Park, E Pasyuk, Sa Philips, N Pivnyuk, D Pocanic, O Pogorelko, E Polli, I Popa, S Pozdniakov, Bm Preedom, Jw Price, Y Prok, D Protopopescu, Lm Qin, Ba Raue, G Riccardi, G Ricco, M Ripani, Bg Ritchie, F Ronchetti, G Rosner, P Rossi, D Rowntree, Pd Rubin, F Sabatie, C Salgado, Jp Santoro, V Sapunenko, Ra Schumacher, Vs Serov, A Shafi, Yg Sharabian, J Shaw, Av Skabelin, Es Smith, Lc Smith, Di Sober, A Stavinsky, S Stepanyan, P Stoler, Ii Strakovsky, R Suleiman, M Taiuti, S Taylor, Dj Tedeschi, U Thoma, R Thompson, R Tkabladze, L Todor, C Tur, M Ungaro, Mf Vineyard, Av Vlassov, K Wang, Lb Weinstein, Dp Weygand, Cs Whisnant, M Williams, E Wolin, Mh Wood, A Yegneswaran, J Yun, L Zana
Michael Williams
The three-body photodisintegration of 3He has been measured with the CLAS detector at Jefferson Lab, using tagged photons of energies between 0.35 GeV and 1.55 GeV. The large acceptance of the spectrometer allowed us for the first time to cover a wide momentum and angular range for the two outgoing protons. Three kinematic regions dominated by either two- or three-body contributions have been distinguished and analyzed. The measured cross sections have been compared with results of a theoretical model, which, in certain kinematic ranges, have been found to be in reasonable agreement with the data.