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

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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_at_mail.nsysu.edu.tw 

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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)

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Kaoping River
Dadson et al., 2003
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Historical
????

• Sampling period
• Aug/1999-July/2000 (1998-2000 La Nina event)
• 2002 (2002-04 El Nino event)

1999
2000
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Sampling locations in the Kaoping River
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Sampling locations and their elevations and
discharge contributions
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Sediment Yield (Kaoping watershed)

• 1999/2000 3.6103 g/m2/yr
• 2002 0.656103 g/m2/yr
• Worlds rivers (mean) 150 g/m2/yr
• Islands rivers (mean) 3103 g/m2/yr
• derived from suspended load only

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Particle size vs. river discharge (water
elevation)
Krosa Typhoon
Pabuk Typhoon
Wutip Typhoon
Sepat Typhoon
Wet season
Dry season
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Particulate organic carbon (POC)
Particulate inorganic nitrogen (PON)
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Particulate organic phosphorus (POP)
Particulate inorganic phosphorus (PIP)
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Chemical Yield (Ca, Mg, K, Na, Cl, SO4, HCO3, Si)

• 1999/2000 1.14103 g/m2/yr
• 2002 0.416103 g/m2/yr
• Worlds rivers (ave) 3340 g/m2/yr

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Transport of C and N in the Kaoping River
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Kaoping River
Industrial wastewater
Others
Animal wasterwater
Domestic
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Foot and Mouth Disease
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Nitrogen Fluxes (Anthropogenic contributions)

• Estimated from wastewater discharge 5.6104
  kg/day
• Estimated from difference between baseline and
  in-situ measurements 6.5104 kg/day (Particulate
  nitrogen 4.8 103 kg/day)
• EPA(ROC) report 5.7 104 kg/day
• Anthropogenic contributions to total fluxes 89
  (64715/7297789)

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Phosphorus Fluxes (Anthropogenic contributions)

• Estimated from wastewater discharge 4.7 103
  kg/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
  (7399/1212461)

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Carbon and nutrient yields from the
Kaoping Watershed
08/1999-07/2000 (a) 2002 (b) a/b
Discharge (cms) 270 102 2.6
POC (g/m2/yr) 44.9 2.92 15.4
PIC (g/m2/yr) 18.4 1.27 14.5
DOC (g/m2/yr) 2.27 1.8 1.3
DIC (g/m2/yr) 111 47.7 2.3
PN (g/m2/yr) 0.70 0.47 1.5
DIN (mol/m2/yr) 0.59 0.13 4.5
DIP (mmol/m2/yr) 6.29 5.43 1.2
DSi (mol/m2/yr) 0.41 0.31 1.3
 
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Meterological conditions primarily determine the
material fluxes and proportions of natural and
anthropogenic contributions
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DO
Dec./2003
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Salinity
Salinity
July, 2003
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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

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Dissolved CNP Budgets
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Particulate CNP Budgets
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Carbon, Nitrogen and Phosphorus Budgets
Net fluxes

• Coastal Zone
• ? Primary production
• ? Recycling

• Kaoping Estuary
• ? Addition
• ? Removal

River
Kaoping Watershed
Dissolved Particulater matter
DissolvedRelease
Settling
Denitrification
Sediments ? Recycled
? Preserved
On-going studies
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