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Presentation Biogeochemistry Gustafsson and Gschwend, 1997. Masiello, Druffel and Currie, 2002. Middelburg, Nieuwenhuize and Van Breugel, 1999. Mitra,

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Presentation on theme: "Presentation Biogeochemistry Gustafsson and Gschwend, 1997. Masiello, Druffel and Currie, 2002. Middelburg, Nieuwenhuize and Van Breugel, 1999. Mitra,"— Presentation transcript:

1 Presentation Biogeochemistry Gustafsson and Gschwend, Masiello, Druffel and Currie, Middelburg, Nieuwenhuize and Van Breugel, Mitra, Bianchi, McKee and Sutula, Schmidt and Noack, 2000.

2 Black carbon Highly condensed carbonaceous residue from incomplete combustion processes Soot, charcoal, char and elemental carbon

3 Unit and Structure BC Schmidt and Noack, 2000

4 Identification techniques Optical Thermal Chemical Spectroscopic Molecular marker

5 Compare 2 techniques Thermal oxidation/HCl method for soot Thermal oxidation/HNO3 method for charcoal

6 Relation 2 techniques Middelburg, Nieuwenhuize and Van Breugel, 1999

7 Relation with oc, sc and charcoal Middelburg, Nieuwenhuize and Van Breugel, 1999

8 Unidentified fraction OC Middelburg, Nieuwenhuize and Van Breugel, 1999

9 Identification techniques Optical ThermalThermal Chemical Spectroscopic Molecular marker

10 Masiello, Druffel and Currie, 2002

11

12 Degradation Assumed to be inert because: –Identified in sediments of 65 Ma –Down-core trend in size distribution –It reacts very slow towards chemical oxidation Chemical and microbial mechanisms unknown

13 Biogeochemical processes BC is sink in global carbon cycle Affect the Earth’s radiative heat balance Catalytic effects on chemical reactions Tracer for Earth’s fire history Paleo-atmospheric oxygen concentrations

14 Geological time table Cenozoic EraQuarternary PeriodHolocene Epoch Pleistocene Epoch Tertiary PeriodPliocene Epoch Miocene Epoch Oligocene Epoch Eocene Epoch Paleocene Epoch Mesozoic EraCretaceous Period Jurassic Period Triassic Period Paleozoic EraPermian Period Carboniferous Period Devonian Period Silurian Period Ordovician Period Cambrium Period

15 Global Biogeochemical Cycle of BC Schmidt and Noack, 2000

16 Flux calculation for the continental shelf Sedimentation rates Observed surface BC inventories BC concentrations Area of the shelf region

17 Determination sedimentation rates Gustafsson and Gschwend, 1998

18 Comparison fluxes BC Gustafsson and Gschwend, 1998

19 Global Biogeochemical Cycle of BC Schmidt and Noack, 2000

20 Mississippi River BC input Thermal oxidation followed by acidification Discharge in 1999 was 4,8*10 -4 Pg 5% of total BC in oceanic and coastal sediments Santa Clara River 5,4*10 -5 Pg

21 Conclusion Analyses of BC remains with uncertainties Degradation Effect of BC on the global carbon cycle has to be quantified


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