LTER Science Council 2015 Instructions Address question: “How is LTER advancing our understanding of the dynamics and controls of inorganic nutrients?”

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Presentation transcript:

LTER Science Council 2015 Instructions Address question: “How is LTER advancing our understanding of the dynamics and controls of inorganic nutrients?” 3 Slides, 5 minutes (no exceptions, no animations) Modify the following example template: Slide 1: Brief orientation to your site’s research on inorganic nutrients Slide 2: Share recent key results made possible by LTER Slide 3: Explain relevance of research and how it might contribute to interesting, novel synthesis We suggest that you might highlight results related to one of these major topic areas: 1. Greenhouse gas emissions / Ecosystem role in climate-change feedbacks 2. Hydrologic and marine transport, transformation, and retention of inorganic nutrients 3. Soil/sediment N, P, and organic C dynamics including coupled biogeochemical processes 4. Role of nutrients in controlling primary production and/or species composition/diversity 5. Other powerpoint file to no later than 21 April 2015

Inorganic Nutrient Research Georgia Coastal Ecosystems LTER GCE-LTER Sampling: 10 stns quarterly; 11 stns monthly; 12 stns hybrid DIN, DIP, SiO4, DON, DOC, DIC, pH, Chl, CTD/PAR Findings: Sapelo, Doboy similar; midsummer NO x peak Altamaha driven by river Relatively little communication between sounds Summer strongly heterotrophic * * * * * * * * * * *

Recent Key Findings - Inorganic Nutrients Georgia Coastal Ecosystems LTER Nitrous Oxide GCE-LTER Nitrous Oxide Water is supersaturated, N 2 O released to atmosphere!!! Midsummer NO x peak is due to an annual bloom of ammonia oxidizing Archaea Peak is due to accumulation of NO 2 !!! Net accumulation of DIN as NO x during this event Accompanied by N 2 O production Timing highly predictable from year to year, magnitude varies Found at other estuarine sites, but not all

Syntheses ideas - Inorganic Nutrients Georgia Coastal Ecosystems LTER GCE- LTER Relevance Eutrophication Nitrification and denitrification uncoupled Ecosystem stoichiometry - affects the form of N available to phytoplankton Nitrous oxide production Synthesis Activities What is the range (habitat types) of this phenomenon (AOA are everywhere) What can we learn about its causes and controls by inter-site comparisons Sensitive to climate linkage through temperature or temperature range? What are we missing with low temporal resolution sampling? Measure NO 2 !!! Measure N 2 O!!!