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Integrating satellite observations and modern climate measurements with the recent sedimentary record: An example from Southeast Alaska

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  • Assessments of climate change over time scales that exceed the last 100 years require robust integration of high-quality instrument records with high-resolution paleoclimate proxy data. In this study, we show that the recent biogenic sediments accumulating in two temperate ice-free fjords in Southeast Alaska preserve evidence of North Pacific Ocean climate variability as recorded by both instrument networks and satellite observations. Multicore samples EW0408-32MC and EW0408-43MC were investigated with ¹³⁷Cs and excess ²¹⁰Pb geochronometry, three-dimensional computed tomography, high-resolution scanning XRF geochemistry, and organic stable isotope analyses. EW0408-32MC (57.162 degrees N, 135.357 degrees W, 146 m depth) is a moderately bioturbated continuous record that spans AD ~ 1930-2004. EW0408-43MC (56.965 degrees N, 135.268 degrees W, 91 m depth) is composed of laminated diatom oozes, a turbidite, and a hypopycnal plume (river flood) deposit. A discontinuous event-based varve chronology indicates 43MC spans AD ~ 1940-1981. Decadal-scale fluctuations in sedimentary Br/Cl ratios accurately reflect changes in marine organic matter accumulation that display the same temporal pattern as that of the Pacific Decadal Oscillation. An estimated Sitka summer productivity parameter calibrated using SeaWiFS satellite observations support these relationships. The correlation of North Pacific climate regime states, primary productivity, and sediment geochemistry indicate the accumulation of biogenic sediment in Southeast Alaska temperate fjords can be used as a sensitive recorder of past productivity variability, and by inference, past climate conditions in the high-latitude Gulf of Alaska.
  • This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://www.agu.org/journals/jgr/
  • Keywords: scanning XRF, paleoproductivity, Pacific Decadal Oscillation, bromine, computerized tomography, Gulf of Alaska
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  • Addison, J. A., Finney, B. P., Jaeger, J. M., Stoner, J. S., Norris, R. D., & Hangsterfer, A. (2013). Integrating satellite observations and modern climate measurements with the recent sedimentary record: An example from southeast alaska. Journal of Geophysical Research: Oceans, 118(7), 3444-3461. doi:10.1002/jgrc.20243
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  • 118
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  • 7
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