Title page for etd-0614100-144346


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URN etd-0614100-144346
Author Weu-Hsin Liu
Author's Email Address m8553601@student.nsysu.edu.tw
Statistics This thesis had been viewed 4687 times. Download 1329 times.
Department Marine Geology and chemistry
Year 1999
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title On the composition and size distribution of settling particulates in the sea off northeastern Taiwan
Date of Defense 2000-06-10
Page Count 100
Keyword
  • south Okinawa trough
  • northeast off Taiwan
  • settling particle
  • particle size distribution
  • trace metal
  • opal
  • organic carbon
  • Abstract Abstract
       In order to understand the source, transport pathway and sink of settling particulates off northeast Taiwan, time-series sediment traps (PPS-3/3) were deployed on the north slope of Ilan ridge (T18) and in the Okinawa trough (T15 and T16) to collect settling particulates. The trapped particulate samples were determined for apparent mass flux (T18), particle size distribution, and contents of lithogenic portion, metals (Al, Mg, Ca, Fe, Mn, Cu), opal, OC (organic carbon) and IC (inorganic carbon). The results show that mass flux in winter is higher than in summer except for typhoon or rainstorm in summer which may cause high particulate flux. At mooring T11 and T17, only 2 cups had collected particulates but with rapid decrease, and the remaining cups were empty. It is not clear whether Kuroshio plays a role and further investigation is needed. The trapped particulates were mainly clay and silt in the north slope of Ilan ridge and south Okinawa trough, and were sand and silt in the Mien-Hwa canyon. The portion of coarse silt and larger particles (>31 mm) decreases with an increase of distance from the land (from T11 to T18).  The grain size distribution of particulate at T18 is similar to that at T15 and T16, but the mass flux in the north slope of Ilan ridge is an order of magnitude higher than in the south Okinawa trough. The size distribution pattern below 600m water depth is very similar at both T15 and T16, but the coarse fraction (> 31 mm) is more at the upper than lower traps, presumably due to lateral transport. The Mn content of the trapped particulates in the south Okinawa trough is twice as hign as that in the north slope of Ilan ridge. High Mn/Al ratio in the trough suggests that Mn is supplied by hydrothermal activities. Lithogenic portions occupy about 84~88.5% at T18, T16 and T15. Relative to other marginal seas biogenic contributions are clearly lower. 
    Advisory Committee
  • Jia-Jang Hung - chair
  • Yu-Chia Chung - advisor
  • Files
  • cover-new.pdf
  • indicate access worldwide
    Date of Submission 2000-06-14

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