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April 10

Ocean Fertilization by Gobi Dust Observed: First Deployment of Robotic Carbon Explorers. Gobi Desert Dust Crosses Pacific April 10-14, 2001. PAPA. April 10. May 30. Particulate Organic Carbon. Bishop, J.K.B., et al. (2002) Science 298, 817-821.

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April 10

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  1. Ocean Fertilization by Gobi Dust Observed: First Deployment of Robotic Carbon Explorers Gobi Desert Dust Crosses Pacific April 10-14, 2001 PAPA April 10 May 30 Particulate Organic Carbon Bishop, J.K.B., et al. (2002) Science 298, 817-821.

  2. Ocean Fertilization by Gobi Dust Observed: First Deployment of Robotic Carbon Explorers Gobi Desert Dust Crosses Pacific April 10-14, 2001 PAPA April 10 May 30 UTC days (2001) West to East Decrease in Aerosol => Dust Deposition Satellite Chlorophyll Increased by just 20% Surface Biomass Doubled 0.55 0.45 0.35 Net POC Growth Rate and POC/Chlratio Increased here Similar favorable conditions, but little biomass increase Bishop, J.K.B., et al. (2002) Science 298, 817-821.

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  4. SOFeX and Explorer Positions: Jan 10 - Mar 10 2002 SOFeX Hypothesis: SilicaLimitation of Diatom productivity means limited Carbon Export. “North Patch” (55 S) HighNO3 : LowSi (22mM : 2.5mM) “South Patch” (66 S) HighNO3: HighSi (27mM : 60mM) Bishop et al. Science, 304, 417-420,2004 Funding DOE Office of Science , NSF

  5. “North Patch” (55 S) HighNO3 : LowSi (22mM : 2.5mM) 1 8 4 2 0.5 POC (mM) • First Controlled Long-term High Frequency Observations of the effects of purposful iron additions to the ocean. • Measuered Enhanced Carbon Export at 55S • Fe added : C Exported mole ratio >1:104 • SOFeX Hypothesis Contradicted • Export surprisingly strong N of the Polar Front • Cost Effective Carbon Monitoring Possible CARBON FLUX INDEX in RED MLD 0.05 Bishop et al. Science, 304, 417-420,2004

  6. Background/information slides

  7. First Carbon Explorers Deployed in the N. Pacific at PAPA April 10 2001 Gobi Desert Dust Crosses Pacific April 10-14, 2001 PAPA Bishop, J.K.B., R.E. Davis and J.T. Sherman (2002) Robotic Observations of Dust Storm Enhancement of Carbon Biomass in the North Pacific. Science 298, 817-821. [LBNL #50120]

  8. Carbon Explorers at OWS PAPA 50N 145W2001: Dawn 1000 - 0 m; Dusk 300 - 0 m; Noon 300 - 0 m; Sleep at 300 m2003: Dawn 1000 - 0 m; Dusk 300 - 0 m; Noon 300 - 0 m; Sleep 120, 250, 800 m (2003) Antifouling Method Leads to Carbon Flux Index

  9. Carbon Flux Index Concept: Transmissometer Particles Accumulate Here Exhaust from CTD pump AFTER SLEEP PERIOD 1) Read Transmissometer Start CTD Pump to ‘blow off’ accumulated particles. 3) Read Transmissometer Carbon Flux Index =(3)-(1) (Time at 100 m) Bishop et al. Science, 304, 417-420,2004

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