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Implications of C/N Ratios from Two USGS Sediment Trap Samples Recovered from the Kaoping Canyon Saulwood Lin, Institute of Oceanography Natioanal Taiwan.

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Presentation on theme: "Implications of C/N Ratios from Two USGS Sediment Trap Samples Recovered from the Kaoping Canyon Saulwood Lin, Institute of Oceanography Natioanal Taiwan."— Presentation transcript:

1 Implications of C/N Ratios from Two USGS Sediment Trap Samples Recovered from the Kaoping Canyon Saulwood Lin, Institute of Oceanography Natioanal Taiwan University James Liu Institute of Marine Geology and Chemistry National Sun-Yat-Sen University 「 International Sediment Trap Workshop 」 National Sun Yat-sen University, Kaohsiung, Taiwan. March 23-27, 2009

2 (Hedges et al., 1995)

3 Dadson et al. (2003) (Huh et al., 2007)

4 1.Normal river plume 2.Density flow Modes of SS transport :

5 From Taiwan Central Weather Bureau Annual rainfall Wet season Dry season

6 High frequency of typhoon invasion (~4 per year) From Central Weather Bureau Total 436 typhoons invaded Taiwan during 1897 to 2007

7 (Boutton et al., 1991) ( Kendall et al., 2001)

8 Sediment Mooring T6KP: Winter (Dry) Season (January 10-March 20, 2008) T7KP: Summer (Wet) Season (July 7-September 11, 2008) (From J. Liu)

9 T7KP T6KP USGS Sediment Trap (From J. Liu)

10 Samples from T7KP 6.8 cm 108.5 cm 191 cm 25 cm a1: 21cma2: 23cm Timer Sediment length in the coreliner: 192cm Time marker 02 at (186~188cm) Time marker 01 at (188~190cm) (0cm) 5.85 cm 5.4 cm 6.8 cm (a) (b) b: 49cm (From J. Liu)

11 Typhoon Invasion (July 7-Sept. 11, 2008)

12 CalmagiFung WongKammuriNuri (From J. Liu)

13 Objective 1.To study particulate (%TOC, %TON, C/N ratio,  13 C Org ) passing through the KP Canyon during wet and dry season, 2.To delineate source(s) of particle transport through the KP canyon, 3.To examine the effect of typhoon on types of organic carbon passing the canyon, 4.To compare short event driven and seasonal variations on organic carbon deposition and transport.

14 Analytical Method Grind sample Remove Carbonate (2N HCl for 8 hrs) Freeze dry (5 days) Elemental Analyzer (%TOC, %TON) C/N molar ratio CHN Analyzer Thermo Flash 2000

15 Problems may encounter using Elemental Analyzer 1. Sample Weight 2. Homogenized Sample

16 T6KP Sediment Trap: Dry Season

17 2-m Core liner Trap funnel Jul 8, 2008 Sep 11, 2008 Aug 3, 2008 Jul 13, 2008 typhoon floods T7KP Sediment Trap: wet season (from CA Huh)

18 T7KP Sediment Trap: wet season ● Sand ▲ Clay ■ Silt (Grain size data from J Liu) Typhoon Flood Plant Debris Typhoon Flood ?

19 Summary. Particulate organic carbon, nitrogen contents and grain sizes showed semi-cyclic oscillation during dry season, while extreme values were observed for wet season,. Distinct C/N ratios are found for sediments collected during dry and wet season;. C/N ratios are mostly marine in sediments collected during dry season, probably a result of periodical tide/current winnowing into the KP canyon;. C/N ratios fluctuate rapidly during wet season, but, mostly terrigenous, a result of typhoon event. Particular organic matter were carried into the canyon during both season but probably through different transport mechanism, tide vs flood (hyperpycnal ?).

20 Thanks for your attention Comments and suggestions

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