Kao Shuh-Ji

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Kao
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Shuh-Ji
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  • Article
    Cyclone-driven deep sea injection of freshwater and heat by hyperpycnal flow in the subtropics
    (American Geophysical Union, 2010-11-04) Kao, Shuh-Ji ; Dai, Minhan ; Selvaraj, K. ; Zhai, W. ; Cai, Pinghe ; Chen, Shih-Nan ; Yang, J. Y. T. ; Liu, J. T. ; Liu, C. C. ; Syvitski, James P. M.
    The western tropical Pacific gives birth to 23 tropical cyclones annually, bringing torrential rainfall to mountainous islands across Oceania resulting in a global sediment production hotspot, in which many rivers have great hyperpycnal potential. By using a temperature (T) and salinity (S) profiler, we observed anomalously warm, low salinity turbid water at 3000–3700 m depths in seas ∼180 km off southwestern Taiwan immediately after Typhoon Morakot in 2009. This 250m-thick bottom-hugging water occupies ∼2400 km2, and contains 0.15% freshwater, suggesting a remarkably high fraction (6–10%) of event rainfall from southwestern Taiwan. These characteristics indicate the turbid water originated from shallow coastal waters via hyperpycnal flow. Apparently, sediment produced from the land during tropical cyclones open an “express gate” to convey heat and freshwater vertically to the deep ocean basin subsequently warming the deep water from the bottom up.
  • Article
    Monsoon hydrography and productivity changes in the East China Sea during the past 100,000 years : Okinawa Trough evidence (MD012404)
    (American Geophysical Union, 2009-08-29) Chang, Yuan-Pin ; Chen, Min-Te ; Yokoyama, Yusuke ; Matsuzaki, Hiroyuki ; Thompson, William G. ; Kao, Shuh-Ji ; Kawahata, Hodaka
    We analyzed the high-resolution foraminifer isotope records, total organic carbon (TOC), and opal content from an Okinawa Trough core MD012404 in order to estimate the monsoon hydrography and productivity changes in the East China Sea (ECS) of the tropical western Pacific over the past 100,000 years. The variability shown in the records on orbital time scales indicates that high TOC intervals coincide with the increases of boreal May–September insolation driven by precession cycles (∼21 ka), implying a strong connection to the variations in monsoons. We also observed possibly nearly synchronous, millennial-scale changes of the ECS surface hydrography (mainly driven by salinity changes but also by temperature effects) and productivity coincident with monsoon events in the Hulu/Dongge stalagmite isotope records. We found that increased freshening and high productivity correlate with high monsoon intensity in interstadials. This study suggests that the millennial-scale changes in monsoon hydrography and productivity in the ECS are remarkable and persistent features over the past 100,000 years.