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Creator:: Pisias, Nicklas G., Mayer, Larry A., and Mix, Alan C.
Abstract:: The primary objective of Leg 138 was to provide detailed information about the ocean's response to global climate change during the Neogene. Two north south transects were drilled (95° and 110°W) within the region of equatorial divergence driven upwelling (and thus high accumulation rates and resolution) and spanning the major...
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Full Text:: EQUATORIAL PACIFIC DURING THE NEOGENE: SYNTHESIS OF LEG 138 DRILLING RESULTS1 Nicklas G. Pisias,2 Larry A

Creator:: Lyle, Mitchell, Mix, Alan C., and Pisias, Nicklas G.
Abstract:: We constructed biogenic mass accumulation rate (MAR) time series for eastern Pacific core transects across the equator at ~105˚and ~85˚W and along the equator from 80˚to 140˚W. We used empirical orthogonal function (EOF) analysis to extract spatially coherent patterns of CaCO₃deposition for the last 150 kyr. EOF mode 1 (51%...
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Full Text:: State University, Boise, Idaho, USA Alan Mix and Nicklas Pisias College of Ocean and Atmospheric

Creator:: Mix, Alan C., Morey, Ann E., Pisias, Nicklas G., and Hostetler, Steven W.
Abstract:: The sensitivity of the tropics to climate change, particularly the amplitude of glacial‐to‐interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no‐analog planktonic foraminiferal assemblages in the equatorial oceans that...
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Full Text:: problem yields cool ice age tropics Alan C. Mix, Ann E. Morey, and Nicklas G. Pisias College of

Creator:: Hagelberg, T. K., Pisias, Nicklas G., Mayer, L. A., Shackleton, N. J., and Mix, Alan C.
Abstract:: High resolution, continuous records of GRAPE wet bulk density (a carbonate proxy) from Ocean Drilling Program Leg 138 provide one the opportunity for a detailed study of eastern equatorial Pacific Ocean carbonate sedimentation during the last 6 m.y. The transect of sites drilled spans both latitude and longitude in the...
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Full Text:: Ocean Drilling Program Scientific Results Volume 138 Pisias

Creator:: Hagelberg, T. K., Pisias, Nicklas G., Shackleton, N. J., Mix, Alan C., and Harris, Sara E.
Abstract:: Ocean Drilling Program (ODP) Leg 138 was designed to study the late Neogene paleoceanography of the equatorial Pacific Ocean at time scales of thousands to millions of years. Crucial to this objective was the acquisition of continuous, high-resolution sedimentary records. It is well known that between successive advanced piston corer...
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Full Text:: Ocean Drilling Program Scientific Results Volume 138 Pisias

Creator:: Mix, Alan C., Harris, Sara E., Hagelberg, T. K., Pisias, Nicklas G., and Shackleton, N. J.
Abstract:: Establishing true depths of recovered sediments is critical to determining sedimentation rates for high-resolution paleoclimatic studies. We have corrected the composite depth scale, which accounts for the entire continuous sedimentary sequence, so that sediment depths are consistent with logging depths, or "true" depths. We accomplished this by taking advantage of...
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Full Text:: Ocean Drilling Program Scientific Results Volume 138 Pisias

Creator:: Mix, Alan C., Rugh, W., Pisias, Nicklas G., Veirs, S., and Leg 138 Scientific Party
Abstract:: During ODP Leg 138, we tested a prototype instrument, developed at Oregon State University, for measuring light reflectance in 511 channels of the visible and near-infrared bands. The technique of reflectance spectroscopy has been used for some time in chemistry and mineralogy (e.g., Hunt, 1977; Gaffey, 1986) and has found...
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Full Text:: . Mix,2 W. Rugh,2 N. G. Pisias, 2 S. Veirs,3 Leg 138 Shipboard Sedimentologists (T. Hagelberg, S. Hovan

Creator:: Hostetler, S. W., Clark, Peter U., 1956-, Bartlein, P. J., Mix, Alan C., and Pisias, Nicklas G.
Abstract:: We model the response o f the climate system during Heinrich event 2 (H2) by employing an atmospheric general circulation model, using boundary conditions based on the concept of a "canonical" Heinrich event. The canonical event is initialized with a full-height Laurentide ice sheet (LIS) and CLIMAP sea surface temperatures...
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Full Text:: , and N.J. Pisias 4 Abstract. We model the response of the climate system during Heinrich event 2 (H2

Creator:: Mayer, Larry A., Pisias, Nicklas G., Mix, Alan C., Lyle, Mitchell, Arason, Pordur, and Mosher, D.
Abstract:: To facilitate the selection of drill sites for Leg 138, a site survey program was conducted on board the Scripps Institution of Oceanography's research vessel Thomas Washington (Cruise Venture 1). During this cruise, which departed San Diego on 30 August 1989 and arrived in Manzanillo, Mexico, on 4 October 1989,...
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Full Text:: . 138 7. SITE SURVEYS1 Larry A. Mayer,2 N. G. Pisias,3 A. C. Mix,4 M. W. Lyle,5 P. Arason,5 and D

Creator:: Mix, Alan C., Pisias, Nicklas G., Rugh, W., Wilson, J., Morey, A., and Hagelberg, T. K.
Abstract:: Benthic foraminifer and δ¹³C data from Site 849, on the west flank of the East Pacific Rise (0°11'N, 110°3l'W; 3851 m), give relatively continuous records of deep Pacific Ocean stable isotope variations between 0 and 5 Ma. The mean sample spacing is 4 k.y. Most analyses are from Cibicides wuellerstorfi>...
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Full Text:: Ocean Drilling Program Scientific Results Volume 138 Pisias

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