1. Toward Implementing BLING (Biogeochemistry with Light, Iron, Nutrients and Gases) in the MITgcm Brendan Carter, Ariane Verdy, Matt Mazloff, Bob Key, and Jorge Sarmiento brendan.carter@gmail.com

2. WHY? DIC package TOPAZ Darwin NEMURO Full Ecosystem

3. WHY? DIC package

4. WHY? DIC package

5. WHY? BLING? DIC TOPAZ/Darwin

6. WHY? BLING? DIC TOPAZ/Darwin

7. LIFE DIC 0.66 0.33

8. LIFE DIC BLING LIFE 0.66 0.33 0.66 0.33

9. LIFE DIC BLING 0.66 0.33 LIFE 0.1 ?

10. LIFE DIC BLING The rest 0.66 0.33 LIFE 0.1 ? Implicit microbial loop.

11. LIFE DIC BLING The rest 0.66 0.33 0.1 Small Phytoplankton Large Phytoplankton 1 0.18 Implicit size structure.

12. Small v. Large Biomass BLING assumes that: 1.Growth and mortality are in steady state. 2.Large phytoplankton has less density dependence to mortality (^4/3) than small (^2). Biomass Growth Horray! Why hast thou forsaken us?

13. Small v. Large Biomass BLING assumes that: 1.Growth and mortality are in steady state. 2.Large phytoplankton has less density dependence to mortality (^4/3) than small (^2). Biomass Growth/mortality Horray! Why hast thou forsaken us? Small Large

14. Small v. Large Biomass BLING assumes that: 1.Growth and mortality are in steady state. 2.Large phytoplankton has less density dependence to mortality (^4/3) than small (^2). Biomass Growth/mortality Horray! Why hast thou forsaken us? Small Large

15. Small v. Large Biomass BLING assumes that: 1.Growth and mortality are in steady state. 2.Large phytoplankton has less density dependence to mortality (^4/3) than small (^2). Biomass Growth/mortality Small Large Horray! Why hast thou forsaken us?

16. Small v. Large Biomass BLING assumes that: 1.Growth and mortality are in steady state. 2.Large phytoplankton has less density dependence to mortality (^4/3) than small (^2). Biomass Growth/mortality Small Large Small phytoplankton do better when it is warm and when times are hard. …they also export less.

17. Iron and light interaction Experimental evidence suggests: When iron is abundant, more chloroplasts are made, and chloroplasts are more efficient.

18. Iron and light interaction Experimental evidence suggests: When iron is scarce, organisms can’t use light as effectively.

19. Iron and light interaction Shows up twice in the light limitation… In the chlorophyll to carbon ratio and a term representing photosynthetic efficiency Both effectively decrease light limitation with iron.

20. As promised…

22. LIFE DIC BLING The rest 0.66 0.33 0.1 Small Phytoplankton Large Phytoplankton 1 0.18

23. LIFE DIC BLING The rest 0.66 0.33 0.1 Small Phytoplankton Large Phytoplankton 1 0.18

24. Other changes Oxygen is required to remineralize POFe and POP Remineralization curve is not quite a Martin curve even with oxygen. Minor light-adaptation… the amount of light a plankton needs decreases slightly as the mixed layer consistently grows darker

25. Next steps Resolve: co-limitation vs. Leibig’s Law of the minimum. Resolve: mixed layer averaging for irradiance memory term. Compile/debug, test, optimize, and check- in.

26. Temp and prod. Is BLING right for your application? [Chl] Large and Small Fe- Light Light Weight DICBLING