Georgia Tech Biological Oceanography Nutrient Cycles Nutrient limitation
![Georgia Tech Biological Oceanography Nutrient Cycles • Nutrient limitation – N sources • N Georgia Tech Biological Oceanography Nutrient Cycles • Nutrient limitation – N sources • N](https://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-1.jpg)
Georgia Tech Biological Oceanography Nutrient Cycles • Nutrient limitation – N sources • N Cycle – Budget – N 2 Fixation • Links to the C Cycle EAS 4300 Guest Lecture JPM
![Georgia Tech Biological Oceanography Marine N Limitation (Ryther & Dunstan 1971) EAS 4300 Guest Georgia Tech Biological Oceanography Marine N Limitation (Ryther & Dunstan 1971) EAS 4300 Guest](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-2.jpg)
Georgia Tech Biological Oceanography Marine N Limitation (Ryther & Dunstan 1971) EAS 4300 Guest Lecture Krebs, Fig. 25. 08 JPM
![Georgia Tech Biological Oceanography Anthropogenic N Loading Krebs, Fig. 27. 18 Globally, about 20% Georgia Tech Biological Oceanography Anthropogenic N Loading Krebs, Fig. 27. 18 Globally, about 20%](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-3.jpg)
Georgia Tech Biological Oceanography Anthropogenic N Loading Krebs, Fig. 27. 18 Globally, about 20% of anthropogenic N input on land is exported in rivers. Crouzet et al. 1999, EEA EAS 4300 Guest Lecture JPM
![Georgia Tech Biological Oceanography Cyanobacterial bloom in the Baltic (www. eea. europa. eu) Eutrophication Georgia Tech Biological Oceanography Cyanobacterial bloom in the Baltic (www. eea. europa. eu) Eutrophication](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-4.jpg)
Georgia Tech Biological Oceanography Cyanobacterial bloom in the Baltic (www. eea. europa. eu) Eutrophication N inputs to coastal waters often promote algal blooms Dinoflagellate bloom off La Jolla (Photo: P. Franks, SIO) EAS 4300 Guest Lecture Agricultural runoff and blooms (Beman et al. 2005) JPM
![Georgia Tech Biological Oceanography Surface Nutrient Distribution EAS 4300 Guest Lecture Data: e. WOCE. Georgia Tech Biological Oceanography Surface Nutrient Distribution EAS 4300 Guest Lecture Data: e. WOCE.](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-5.jpg)
Georgia Tech Biological Oceanography Surface Nutrient Distribution EAS 4300 Guest Lecture Data: e. WOCE. Plot prepared with ODV JPM
![Georgia Tech Biological Oceanography Upper Water Column: NPSG Thermal stratification reduces nutrient supply – Georgia Tech Biological Oceanography Upper Water Column: NPSG Thermal stratification reduces nutrient supply –](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-6.jpg)
Georgia Tech Biological Oceanography Upper Water Column: NPSG Thermal stratification reduces nutrient supply – Thermocline inhibits mixing – Nutrients stripped from surface layer by biota – Production is nutrient (N) limited over much of the open ocean EAS 4300 Guest Lecture Krebs, Fig. 25. 07 JPM
![Georgia Tech Biological Oceanography N-Cycle as a Redox Web EAS 4300 Guest Lecture (Modified Georgia Tech Biological Oceanography N-Cycle as a Redox Web EAS 4300 Guest Lecture (Modified](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-7.jpg)
Georgia Tech Biological Oceanography N-Cycle as a Redox Web EAS 4300 Guest Lecture (Modified from Codispoti 2001 and Liu 1979) JPM
![Georgia Tech Biological Oceanography Global N Cycle Cartoon Fluxes in Tg N y-1 land: Georgia Tech Biological Oceanography Global N Cycle Cartoon Fluxes in Tg N y-1 land:](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-8.jpg)
Georgia Tech Biological Oceanography Global N Cycle Cartoon Fluxes in Tg N y-1 land: < 200 ocean: > 400? Lightning: 3 Terr Nfix: 140 Pool sizes (Tg N) Atmosphere: Terr. Biota: Soil organics: Marine NO 3 -: Marine biota: 3. 9 x 109 13, 000 300, 000 570, 000 500 > 80 20 Marine NFix: >135 EAS 4300 Guest Lecture Crouzet et al. 1999, EEA JPM
![Georgia Tech Biological Oceanography Oceanic Nitrogen Budget Estimates EAS 4300 Guest Lecture JPM Georgia Tech Biological Oceanography Oceanic Nitrogen Budget Estimates EAS 4300 Guest Lecture JPM](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-9.jpg)
Georgia Tech Biological Oceanography Oceanic Nitrogen Budget Estimates EAS 4300 Guest Lecture JPM
![Georgia Tech Biological Oceanography Who Cares? • Broad reaches of the ocean are N-limited. Georgia Tech Biological Oceanography Who Cares? • Broad reaches of the ocean are N-limited.](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-10.jpg)
Georgia Tech Biological Oceanography Who Cares? • Broad reaches of the ocean are N-limited. – Recycling of N within the water column supports biological production, but… – Injection of new N into the upper water column is required to support export production. • The N and C cycles are tightly coupled through biological production of organic matter (C: N ≈ 7). • N 2 -fixation plays a key role in regulating the global C cycle but we still don’t how much N 2 -fixation is occurring in the ocean, who’s doing it, and where! EAS 4300 Guest Lecture JPM
![Georgia Tech Biological Oceanography New vs. Regenerated Production NH 4+ EAS 4300 Guest Lecture Georgia Tech Biological Oceanography New vs. Regenerated Production NH 4+ EAS 4300 Guest Lecture](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-11.jpg)
Georgia Tech Biological Oceanography New vs. Regenerated Production NH 4+ EAS 4300 Guest Lecture modified from http: //www. up. ethz. ch/research/nitrogen_cycle/index Biological Pump JPM
![Georgia Tech Biological Oceanography North Atlantic Nutrient Ratios EAS 4300 Guest Lecture Data: e. Georgia Tech Biological Oceanography North Atlantic Nutrient Ratios EAS 4300 Guest Lecture Data: e.](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-12.jpg)
Georgia Tech Biological Oceanography North Atlantic Nutrient Ratios EAS 4300 Guest Lecture Data: e. WOCE. Plot prepared with ODV JPM
![Georgia Tech Biological Oceanography N* Distributions Reflect the Impact of N 2 -Fixation & Georgia Tech Biological Oceanography N* Distributions Reflect the Impact of N 2 -Fixation &](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-13.jpg)
Georgia Tech Biological Oceanography N* Distributions Reflect the Impact of N 2 -Fixation & Denitrification N* = 0. 87( [NO 3 -] - 16[PO 43 -] + 2. 9) EAS 4300 Guest Lecture (Gruber & Sarmiento 1999) Data: e. WOCE. Plot prepared with ODV JPM
![Georgia Tech Biological Oceanography Diazotroph Diversity ? (Images courtesy R. Foster) (Zehr et al. Georgia Tech Biological Oceanography Diazotroph Diversity ? (Images courtesy R. Foster) (Zehr et al.](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-14.jpg)
Georgia Tech Biological Oceanography Diazotroph Diversity ? (Images courtesy R. Foster) (Zehr et al. , 2001. Nature 412) EAS 4300 Guest Lecture JPM
![Georgia Tech Biological Oceanography KM 0703: 11 Mar – 15 Apr 2007 EAS 4300 Georgia Tech Biological Oceanography KM 0703: 11 Mar – 15 Apr 2007 EAS 4300](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-15.jpg)
Georgia Tech Biological Oceanography KM 0703: 11 Mar – 15 Apr 2007 EAS 4300 Guest Lecture JPM
![Georgia Tech Biological Oceanography KM 0703 Stns. 4 - 10 Group A Abundance EAS Georgia Tech Biological Oceanography KM 0703 Stns. 4 - 10 Group A Abundance EAS](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-16.jpg)
Georgia Tech Biological Oceanography KM 0703 Stns. 4 - 10 Group A Abundance EAS 4300 Guest Lecture (Moisander et al. , in prep) JPM
![Georgia Tech Biological Oceanography Areal Rate. N ( µmole m d ) KM 0703 Georgia Tech Biological Oceanography Areal Rate. N ( µmole m d ) KM 0703](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-17.jpg)
Georgia Tech Biological Oceanography Areal Rate. N ( µmole m d ) KM 0703 Areal -Fixation Rates 2 -2 EAS 4300 Guest Lecture -1 JPM
![Georgia Tech Biological Oceanography Fluxes in Tg N y-1 EAS 4300 Guest Lecture Biogeochemical Georgia Tech Biological Oceanography Fluxes in Tg N y-1 EAS 4300 Guest Lecture Biogeochemical](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-18.jpg)
Georgia Tech Biological Oceanography Fluxes in Tg N y-1 EAS 4300 Guest Lecture Biogeochemical “Gears” Gruber & Galloway, 2008, Nature JPM
![Georgia Tech Biological Oceanography N-Cycle Feedbacks EAS 4300 Guest Lecture (inspired by Gruber 2004) Georgia Tech Biological Oceanography N-Cycle Feedbacks EAS 4300 Guest Lecture (inspired by Gruber 2004)](http://slidetodoc.com/presentation_image/0296e26f8ffd4f9f701869eb2ac3d48c/image-19.jpg)
Georgia Tech Biological Oceanography N-Cycle Feedbacks EAS 4300 Guest Lecture (inspired by Gruber 2004) JPM
- Slides: 19