SOEST Faculty & Researcher Works

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    East Pacific Rise 9N: Compiled station, shot, and travel time data for EPR88, EPR93, and EPR97
    ( 2022-01-05) Dunn, Robert
    A combined data set is provided that gives the station and source position information and travel time data for three combined active-source ocean bottom seismograph data sets located along the East Pacific Rise near latitude 9˚N.
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    The Brugd Undergraduate Student Data Solution: A Data Management Collaboration Between Global Environmental Science and Hamilton Library at the University of Hawaiʻi at Mānoa
    ( 2021-08-13) Ramfelt, Oscar ; Guidry, Michael W. ; Young, Jonathan S.
    This paper describes the outcome of the Brugd project, a customized data management solution for undergraduate student learning analytics in the University of Hawaiʻi at Mānoa Global Environmental Science program, with guidance from librarians at Hamilton Library. Our collective effort was to develop a sustainable means of combining past, present, and future institutional and programmatic-collected sources of undergraduate student data, specifically for the Global Environmental Science Program, into a common database for analysis and visualization. The resulting database also needed to be anonymized to both address student privacy concerns and so that resulting analyses could be easily shared and communicated amongst researchers, faculty, and other program stakeholders. This project may serve as a model for in-house learning analytics tools and future data management collaborations between the library and departments both at UHM and other institutions.
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    Extensive Magmatic Heating of the Lithosphere Beneath the Hawaiian Islands Inferred From Salt Lake Crater Mantle Xenoliths
    ( 2020-11-13) Guest, Imani ; Ito, Garrett ; Garcia, Michael O. ; Hellbrand, Eric
    An ongoing challenge in studies of the oceanic upper mantle is how intraplate hotspots impact the thermal structure of the lithosphere. To address this issue at the Hawaiian hotspot, we analyze mineral compositions for a petrographically diverse suite of garnet pyroxenite xenoliths from the Salt Lake Crater (SLC) rejuvenation stage, volcanic tuff ring in Honolulu. Garnet-clinopyroxene geobarometry and two-pyroxene geothermometry indicate equilibrium pressures of 13–18 kbar and temperatures of 1000°C–1100°C. These pressures place the xenoliths at mid-lithospheric depths of 45–55 km, with temperatures 200°C–300°C hotter than expected for normal 90-Myr-old oceanic lithosphere. Garnet and clinopyroxene occur as discrete primary grains, as well as exsolution blebs and lamellae, with lateral dimensions up to several hundred microns. Compositions within garnet and pyroxene grains are remarkably uniform and display no systematic variation with distance to grain boundaries. Together, these observations indicate that the calculated pressures and temperatures reflect the thermal state of the lithosphere under which the xenoliths last equilibrated. We attribute the elevated lithospheric temperatures under Honolulu primarily to the heating by magma as it penetrated the lithosphere during rejuvenation magmatism and the voluminous shield magmatic stage. We anticipate such magmatic heating to be common among all Hawaiian volcanoes, supporting conclusions of a recent study of earthquakes beneath Hawai‘i Island. This local lithospheric thermal anomaly may also contribute to the enigmatically weak flexural response of the lithosphere due to volcano loading along the Hawaiian hotspot chain.
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    Science Commuication Portfolio: A guide to creating communication materials that complement your science
    ( 2015-04-06) Wood-Charlson, Elisha M ; Varga, Melissa
    Are you working on a research manuscript, grant, annual report, or project summary that requires technical language? Do you feel that your finding, if communicated properly, could be useful to people beyond your professional network? This communication-training document for scientists is designed to help you do just that – on your own time and for a variety of verbal and written communication styles. We also provide an example portfolio on the topic of sea level rise for reference.
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    An unexpected disruption of the atmospheric quasi-biennial oscillation
    (Science, 2016-09-23) Osprey, Scott M. ; Butchart, Neal ; Knight, Jeff R. ; Scaife, Adam A. ; Hamilton, Kevin ; Anstey, James A. ; Schenzinger, Verena ; Zhang, Chunxi
    One of the most repeatable phenomena seen in the atmosphere, the quasi-biennial oscillation (QBO) between prevailing eastward and westward wind jets in the equatorial stratosphere (approximately 16 to 50 kilometers altitude), was unexpectedly disrupted in February 2016. An unprecedented westward jet formed within the eastward phase in the lower stratosphere and cannot be accounted for by the standard QBO paradigm based on vertical momentum transport. Instead, the primary cause was waves transporting momentum from the Northern Hemisphere. Seasonal forecasts did not predict the disruption, but analogous QBO disruptions are seen very occasionally in some climate simulations. A return to more typical QBO behavior within the next year is forecast, although the possibility of more frequent occurrences of similar disruptions is projected for a warming climate.