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    Cyclone-driven deep sea injection of freshwater and heat by hyperpycnal flow in the subtropics

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    2010GL044893.pdf (1.914Mb)
    Date
    2010-11-04
    Author
    Kao, Shuh-Ji  Concept link
    Dai, Minhan  Concept link
    Selvaraj, K.  Concept link
    Zhai, W.  Concept link
    Cai, Pinghe  Concept link
    Chen, Shih-Nan  Concept link
    Yang, J. Y. T.  Concept link
    Liu, J. T.  Concept link
    Liu, C. C.  Concept link
    Syvitski, James P. M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4163
    As published
    https://doi.org/10.1029/2010GL044893
    DOI
    10.1029/2010GL044893
    Keyword
     Cycloen; Hyperpycnal flow; Typhoon Morakot; Taiwan; Oceania 
    Abstract
    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.
    Description
    Author Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 37 (2010): L21702, doi:10.1029/2010GL044893.
    Collections
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Geophysical Research Letters 37 (2010): L21702
     
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