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Announcements in class 2/5/07 Movie Wed. Don’t miss it! Material will be on the exam. Only one showing. Problem Set 4 is posted online. Print it out yourself.

Published byArabella White Modified over 9 years ago

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Presentation on theme: "Announcements in class 2/5/07 Movie Wed. Don’t miss it! Material will be on the exam. Only one showing. Problem Set 4 is posted online. Print it out yourself."— Presentation transcript:

1 Announcements in class 2/5/07 Movie Wed. Don’t miss it! Material will be on the exam. Only one showing. Problem Set 4 is posted online. Print it out yourself. PS 4 is due in class Monday, 2/12/07 PS 5 will be posted Mon. 2/12 and due Wed. 2/21

2 Outline f-ratio Phosphorous Cycling Carbon Cycling

3 Nitrate Phytoplankton Upwelling Mixing Vertical Flux N 2 Fixation Rivers Deposition PON DIN Euphotic Zone

4 f-ratio Upwelling Zone 0.8 Gyre 0.1 Global Average < 0.5 New Production New + Regenerated Production

5 Sediment traps to catch sinking particles

6

7 Sustainable yields

8 Nitrate Phytoplankton Upwelling Mixing Vertical Flux N 2 Fixation Rivers Deposition PON DIN Euphotic Zone Fishing

9 New Production Oligotrophic gyres Upwelling regions

10

11 ↑Annual ↓Perennial r-selected K-selected

12 Chemical Forms – P PO 4 3- (Phosphate) Organic

13 The cycling of Phosphorus Dissolved InorganicParticulate Organic uptake excretion Runoff upwellingsinking decomposition Balance maintained via weathering of rock

14 Chemical Transformations – P Assimilation PO 4 3- → Organic Phytoplankton or other autotrophs Remineralization Organic → PO 4 3- Heterotrophs Excretion Organic → Dissolved Heterotrophs and Autotrophs

15 Experimental Lakes Area Lake 227

16 Lake 226 C, N, P Eutrophic algal blooms C, N

17 Lake 227

18 Oligotrophic LakeEutrophic Lake 25 - 100 micrograms/liter phosphorus> 15 micrograms/liter phosphorus

19 Chemical forms of Carbon Inorganic –CO 2 –bicarbonate ion HCO 3 - –carbonate ion CO 3 2- Organic (fixed …) Dissolved (DIC and DOC) Particulate (biomass and detritus)

20 Carbonate Equilibrium CO 2 «» HCO 3 - «» CO 3 2- dissolved bicarbonate carbonate CO 2 ↑ HCO 3 - ↑ CO 3 2- ↑ pH ↓ Ocean pH 8.2

21 Source NASA

22 Source R. Rohde

23 C Cycle “Food Web” Diagram P Z B Dissolved Inorganic Carbon Dissolved Organic Carbon Main Thermocline CO 2 Dissolved Inorganic Carbon Dissolved Organic Carbon Deep Remineralization Sinking Particles

24 Pteropod Foraminifera Coccolithophore

25 Carbon Solubility Pump –Solubility of CO 2 is greater in cooler water –Deep water formation ↑DIC –C pumped from atmosphere to ocean Biological Pump –POC and PIC sinking, DOC downwelling –C pumped from surface ocean to depth

26 Deep Water Formation Source: USC

27 Thermohaline circulation

28 Saharan Dust Storm Over the Atlantic

29 The Cycling of Silicon Dissolved InorganicParticulate Organic uptake Runoff upwellingsinking dissolution Balance maintained via weathering of rock

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