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Transports of Organic Carbon and Nutrients in the Kaoping River-Sea System

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 E-mail: hungjj@mail.nsysu.edu.tw. Outlines.

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Transports of Organic Carbon and Nutrients in the Kaoping River-Sea System

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  1. 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 UniversityKaohsiung, Taiwan E-mail: hungjj@mail.nsysu.edu.tw

  2. 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)

  3. Kaoping River Dadson et al., 2003

  4. Historical 里嶺大橋 Sampling period: • Aug/1999-July/2000 (1998-2000 La Nina event) • 2002 (2002-04 El Nino event) 1999 2000

  5. Sampling locations in the Kaoping River

  6. Sampling locations and their elevations and discharge contributions

  7. Sediment Yield (Kaoping watershed) • 1999/2000: 3.6*103 g/m2/yr • 2002: 0.656*103 g/m2/yr • World’s rivers (mean): 150 g/m2/yr • Island’s rivers (mean): 3*103 g/m2/yr # derived from suspended load only

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

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

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

  11. Chemical Yield (Ca, Mg, K, Na, Cl, SO4, HCO3, Si) • 1999/2000: 1.14*103 g/m2/yr • 2002: 0.416*103 g/m2/yr • World’s rivers (ave): 33~40 g/m2/yr

  12. Transport of C and N in the Kaoping River

  13. Kaoping River Industrial wastewater Others Animal wasterwater Domestic

  14. Foot and Mouth Disease

  15. Nitrogen Fluxes (Anthropogenic contributions) • Estimated from wastewater discharge: 5.6*104 kg/day • Estimated from difference between baseline and in-situ measurements: 6.5*104 kg/day (Particulate nitrogen: 4.8 *103 kg/day) • EPA(ROC) report: 5.7 *104 kg/day • Anthropogenic contributions to total fluxes: 89% (64715/72977=89%)

  16. Phosphorus Fluxes (Anthropogenic contributions) • Estimated from wastewater discharge: 4.7*103kg/day • Estimated from the difference between baseline and in-situ measurements: 7.4 *103 kg/day(Particulate P: 4.4 *103 kg/day) • EPA(ROC) report: 1.3 *104 kg/day • Anthropogenic contributions to total fluxes: 61% (7399/12124=61%)

  17. Carbon and nutrient yields from the Kaoping Watershed

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

  19. 119°E 121°E 122°E 26° N Taiwan Strait 24° N Kaoping River 22° N

  20. DO Dec./2003

  21. Salinity Salinity July, 2003

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

  23. Dissolved CNP Budgets

  24. Particulate CNP Budgets

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

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