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Sediment clay and silt mineral assemblages provide an excellent means of assessing the provenance of fine-grained Arctic sediment especially when a unique mineral assemblage can be tied to specific source areas. The diffuse spectral reflectance (DSR) first derivative measurements and quantitative X-Ray Diffraction (qXRD) on a high-resolution sediment core from the continental slope north of Alaska constrain the sediment mineralogy. DSR results are augmented by measurements on several adjacent cores and compared to surface sediment samples from the northern Alaskan shelf and slope. Using Principal Component Analysis (PCA), we infer that the three leading DSR modes relate to mixtures of smectite + dolomite, illite...
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Model experiments that attempt to simulate climates of the past serve to identify both similarities and differences between two climate states and, when compared with simulations run by other models and with geological data, to identify model-specific biases. Uncertainties associated with both the data and the models must be considered in such an exercise. The most recent period of sustained global warmth similar to what is projected for the near future occurred about 3.3–3.0 million years ago, during the Pliocene epoch. Here, we present Pliocene sea surface temperature data, newly characterized in terms of level of confidence.
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Handwritten information accompanying photograph: Lamont work hut with hydrohut in distance. This is where the work was done in gravity, magnetics, ocean depth and topography. Note: Telephone line covered with hoarfrost, sometimes two inches thick.
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Typed information accompanying photograph: Print only: Pressure ridges - April 1969. Taken during a hike out to the pressure ridges. The pressure ridges began about two hundred yards beyond the USGS hydrohut. They changed in height and shape regularly. Note: T-3 Photographs - Roll B - Color slides April 1969. These photos were developed into Ektachrome slides in May of 1969. Some have deteriorated. Some were printed as color prints and these may be in better condition than the slides. A few slides were copied into Kodacolor slides. Some images are missing. Photos by Dave Scoboria.
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Caption: Heat flow measurements were taken through an ice hole sheltered by the U.S. Geological Survey's Hydrohut, here shown in April 1969. The hydrohut was tall at one end to accommodate extracting a 3 to 4 meter-long piston corer/heat flow probe using a winch system. Pressure ridges developed in the pack ice adjacent to the T-3 glacial ice are visible in the background. Photo by D. Scoboria, USGS. Note: Dave Scoboria was a USGS field assistant (and the only USGS presence on the island--solely responsible for the measurements) for part of 1968 and 1969.
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Typed information accompanying slides: Signs on Lamont work trailer. Occasionally these pointed in the right direction. June 1969. Note: T-3 Color slides - Roll C - Color slides June 1969. These photos were taken between June 6, 1969 and June 27, 1969 and developed in late 1969 into Kodacolor slides after returning from T-3. One slide has deteriorated. Photos by Dave Scoboria, except for C-6.
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Typed information accompanying negative: Waiting for the next load. We didn't move the crates until all of the drops were completed. Here the crew is waiting. Weather Bureau employee is wearing the checkered hat, GM employee with camera. Bob Sutton and Bob (from University of Washington) in background. Note: T-3 Photographs - Roll F B&W negatives - June paradrop, 1969. There were three paradrops during the summer of 1969 performed by Navy C-130 planes from Elmendorf Air Force Base in Fairbanks, Alaska. These are described in this website, http://www.firebirds.org/menu2/t3/t3_p02.htm On the receiving end of the paradrops on T-3, these days were the high points of the summer season. This roll documents the first...
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Typed information accompanying photograph: Print only. Dawn with abandoned quonset hut in the foreground. Note: T-3 Photographs - Roll A - Color slides February - March 1969. These photos were taken during February and March of 1969 and developed into Ektachrome slides in May of 1969. Some have deteroriated. When the slides were new some of them were printed as color prints. Some prints don't have matching slides. A few slides were copied as Kodacolor slides some time during the 1970s and there are some duplicate slides. The Kodacolor slides have not deteriorated. Some images are missing. (Photos on Roll A taken by Dave Scoboria)
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Typed information accompanying slides: Moving the Lamont work trailer. Bob Sutton drove the bulldozer and directed the operation. The actual move took only a short time. June 1969. Similar to C-16 and C-17. Links to these two images listed in Web Links below. Note: T-3 Color slides - Roll C - Color slides June 1969. These photos were taken between June 6, 1969 and June 27, 1969 and developed in late 1969 into Kodacolor slides after returning from T-3. One slide has deteriorated. Photos by Dave Scoboria, except for C-6.
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Typed information accompanying slides: No fishing. June 1969. Note: T-3 Color slides - Roll C - Color slides June 1969. These photos were taken between June 6, 1969 and June 27, 1969 and developed in late 1969 into Kodacolor slides after returning from T-3. One slide has deteriorated. Photos by Dave Scoboria, except for C-6.
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The attached files contain the black and white negative numbers I-1 through I-9. One morning the snow was covered with ice crystals. It was a sunny day and the ground sparkled. Note: Negative number I-4, sd_i4_neg, is highlighted on this page. Note: T-3 Photographs - Roll I B&W negatives – August-September 1969 This roll shows activities during August and September 1969 on T-3. The summer season had now lasted two months. The weather grew cold. Photos by Dave Scorboria.
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Typed information accompanying slide: Five camp members decided to hike across the ice island to the high spot which could be seen from camp. The day wa sunny when they started on the two to three mile walk. Everyone wore hip boots. Small lakes dotted the path. June 1969. Similar to C-30, C-31, and C-35. Links to these images listed in Web Links below. Note: T-3 Color slides - Roll C - Color slides June 1969. These photos were taken between June 6, 1969 and June 27, 1969 and developed in late 1969 into Kodacolor slides after returning from T-3. One slide has deteriorated. Photos by Dave Scoboria, except for C-6.
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Typed information accompanying slides: Watching the preparations to move the Lamont work trailer. It took a while to get started. June 1969. Note: T-3 Color slides - Roll C - Color slides June 1969. These photos were taken between June 6, 1969 and June 27, 1969 and developed in late 1969 into Kodacolor slides after returning from T-3. One slide has deteriorated. Photos by Dave Scoboria, except for C-6.
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Typed information accompanying slide: Rotten ice to open lead. June 1969. Note: T-3 Color slides - Roll C - Color slides June 1969. These photos were taken between June 6, 1969 and June 27, 1969 and developed in late 1969 into Kodacolor slides after returning from T-3. One slide has deteriorated. Photos by Dave Scoboria, except for C-6.
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Typed information accompanying negative: The USGS living trailer: The trailer had bunk beds at one end, with space for four residents. The other end contained a small darkroom. It was a comfortable place to live. The space equipment cannister is on the floor in the foreground of the picture. After the probe was lost, I had hopes of assembling a complete package of equipment and resuming the casts. There was a spare probe and equipment cannister, but I could not locate a recording device sensitive enough to record thermistor readings. This attempt to reconstruct the assembly lasted approximately two weeks before I realized that it would not be possible with the equipment on T-3. In retrospect, if I had made a radio...
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Handwritten information accompanying photograph: Two living trailers. April (?)


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