Transports of Organic Carbon and Nutrients in the Kaoping River-Sea System J.-J. Hung, H.-M. Yang, E.-T. Yeh, Y.-C. Yeh, C.-M. Ho and I..-J. Lai Institute.

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Presentation transcript:

Transports of Organic Carbon and Nutrients in the Kaoping River-Sea System J.-J. Hung, H.-M. Yang, E.-T. Yeh, Y.-C. Yeh, C.-M. Ho and I..-J. Lai Institute of Marine Geology and Chemistry, National Sun Yat- Sen University Kaohsiung, Taiwan

Outlines Riverine fluxes of suspended sediment, and dissolved and particulate carbon, nitrogen and phosphorus Meterological conditions vs. riverine fluxes Transformation of riverine CNP in the Kaoping Estuary (net fluxes) Coastal CNP budgets (on-going studies)

Dadson et al., 2003 Kaoping River

里嶺大橋 Sampling period: Aug/1999-July/2000 ( La Nina event) 2002 ( El Nino event) Historical

Sampling locations in the Kaoping River

Sampling locations and their elevations and discharge contributions

Sediment Yield (Kaoping watershed)  1999/2000: 3.6*10 3 g/m 2 /yr  2002: 0.656*10 3 g/m 2 /yr  World’s rivers (mean): 150 g/m 2 /yr  Island’s rivers (mean): 3*10 3 g/m 2 /yr # derived from suspended load only

Particle size vs. river discharge (water elevation) Pabuk Typhoon Wutip Typhoon Sepat Typhoon Krosa Typhoon Dry season Wet season

Particulate organic carbon (POC) Particulate inorganic nitrogen (PON)

Particulate organic phosphorus (POP) Particulate inorganic phosphorus (PIP)

Chemical Yield ( Ca, Mg, K, Na, Cl, SO 4, HCO 3, Si)  1999/2000: 1.14*10 3 g/m 2 /yr  2002: 0.416*10 3 g/m 2 /yr  World’s rivers (ave): 33~40 g/m 2 /yr

Transport of C and N in the Kaoping River

Kaoping River Industrial wastewater Others Domestic Animal wasterwater

Foot and Mouth Disease

Nitrogen Fluxes (Anthropogenic contributions) Estimated from wastewater discharge : 5.6*10 4 kg/day Estimated from difference between baseline and in-situ measurements: 6.5*10 4 kg/day (Particulate nitrogen: 4.8 *10 3 kg/day) EPA(ROC) report: 5.7 *10 4 kg/day Anthropogenic contributions to total fluxes: 89% (64715/72977=89%)

Phosphorus Fluxes (Anthropogenic contributions) Estimated from wastewater discharge: 4.7 *10 3 kg/day Estimated from the difference between baseline and in-situ measurements: 7.4 *10 3 kg/day(Particulate P: 4.4 *10 3 kg/day) EPA(ROC) report: 1.3 *10 4 kg/day Anthropogenic contributions to total fluxes: 61% (7399/12124=61%)

Carbon and nutrient yields from the Kaoping Watershed 08/ /2000 (a) 2002 (b) a/b Discharge (cms) POC (g/m 2 /yr) PIC (g/m 2 /yr) DOC (g/m 2 /yr) DIC (g/m 2 /yr) PN (g/m 2 /yr) DIN (mol/m 2 /yr) DIP (mmol/m 2 /yr) DSi (mol/m 2 /yr)

Meterological conditions primarily determine the material fluxes and proportions of natural and anthropogenic contributions

119°E122°E 26° N Taiwan Strait 24° N 22° N Kaoping River 121°E

Dec./2003 DO

July, 2003 Salinity

1.Dissolved inorganic nutrients (except for DIP-addition in high S range) and DOC were transported conservatively through the estuary during the wet season. 2.Nitrate reduction/denitrification occurred in the low S range during the dry season 3.Non-conservative transports - for particulate phases of carbon and nutrients 4.Using Biogeochemical (box) model to derive net fluxes

Dissolved CNP Budgets

Particulate CNP Budgets

Kaoping Watershed Kaoping Estuary ● Addition ● Removal River Dissolved Particulater matter Net fluxes Coastal Zone ● Primary production ● Recycling Sediments ● Recycled ● Preserved Settling Dissolved Release Denitrification Carbon, Nitrogen and Phosphorus Budgets On-going studies