Historical Hydrographic Records off Southwest Taiwan Based on Foraminiferal Isotopic Compositions Hui-Ling Lin IMGC/NSYSU 2008.02.20 Acknowledgements:

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Presentation transcript:

Historical Hydrographic Records off Southwest Taiwan Based on Foraminiferal Isotopic Compositions Hui-Ling Lin IMGC/NSYSU Acknowledgements: Coordinator – Prof. James Liu/NSYSU Prof. Saulwood Lin/NTU Prof. Chi-An Huh/Academia Sinica Prof. Hong-Chun Li/NCKU Prof. Horng-Sheng Mii/NTNU Technicians onboard of R/V ORI+ROIII Jeff, Francy, Lydia, etc…

North of KPC South of KPC Cores collected between October 2004 and April 2006

North of KPC 302 m307 m 638 m683 m 767 m732 m

South of KPC 376 m 491 m 662 m 721 m 822 m

Air temperature record from Hengchun Weather Station warm x x

Multivariate ENSO Index (MEI) x x

North of KPC

South of KPC

warmer/fresher cooler/saline

narrow vs. wide light vs. heavy

Distribution of dyed benthic forams from surface sediments EOF Mode 1 Mode 2 Mode 3

Benthic foraminiferal  18 O   C records

Amplitude of isotope signal at 911 m is greater than that in 1263 m

Take Home Messages: Hydrographic signals recorded by planktonic forams are comparable with local temperature record and global MEI index; Variations of bottom water change (  18 O+  13 C) in deep water (>1000 m) is relatively condensed than those from shallow water.