YouTube playlist of all workshop videos
Monday August 1, 2016
8:00 Continental breakfast (Monell Building Lobby)
8:50 Welcome and introduction (Monell Auditorium)
Webcast video
Introductory talks to orient an interdisciplinary audience
9:20 Ocean Physics – (Bill Jenkins, WHOI)
Webcast video
10:00 Biogeochemistry (Maite Maldonado, Univ. British Columbia)
Webcast video
10:40 Break (Monell Lobby)
11:10 Modeling (Alessandro Tagliabue, Univ. Liverpool, UK)
Webcast video
Theme 1: Biological uptake and trace element bioavailability
Chairs: Bethany Jenkins, Geraldine Sarthou, Mak Saito
11:50 Uptake rates as fundamentals of Fe availability to phytoplankton (Yeala Shaked, Hebrew University, Jerusalem)
Webcast video
12:20 Molecular indicators of trace element bioavailability (Dreux Chappell, Old Dominion)
Webcast video
12:50 Lunch (Monell Lobby)
1:50 Trace Element bioavailability to communities in natural systems (C. Mark Moore, NOC Southampton)
Webcast
2:20 Evidence for multi-element biological uptake (Tung-Yuan Ho, Academia Sinica)
Webcast video
Theme 2: Abiotic cycling and scavenging, including particulate and dissolved speciation
Chairs: John Dunne, Gideon Henderson, Chris Hayes
2:50 Scavenging rates and processes, with a view toward insights gained from inverse models (Tom Weber, Univ. Washington)
Webcast video
3:20 Break (Monell Lobby)
3:50 Particulate speciation and clues about transformations among particulate phases and between particulate and dissolved phases (Phoebe Lam, UC Santa Cruz)
Webcast video
4:20 Dissolved trace element speciation, including ligand production (Kristen Buck, Univ. South Florida)
Webcast video
4:50 Scavenging systematics and surprises in GEOTRACES data (Bob Anderson, LDEO)
Webcast video
Theme 3: Export, recycling and remineralization
Chairs: Greg Cutter, Steve Emerson, Randelle Bundy
5:20 Characterization of export and regeneration in models, including recommendations for new data and model-data comparisons (J. Keith Moore, UC Irvine)
Webcast video
5:50 Upper ocean remineralization and recycling processes, including processes in aggregates, and their impacts on dissolved trace element speciation (Kathy Barbeau, Scripps, UCSD)
Webcast video
6:20 Summary comments
6:30 Reception & Hors d’oeuvres dinner in Monell lobby
Buses and carpools return to hotels after dinner
Tuesday August 2, 2016
7:45 Continental breakfast (Monell Lobby)
Theme 3: Export, recycling and remineralization – Continued
8:30 Announcements
8:40 Observational strategies to quantify export and remineralization, including transfer of carbon cycle applications to trace elements and their isotopes (Ken Buesseler, WHOI)
Webcast video
9:10 Stoichiometry of biological uptake and remineralization and its impact on upper ocean stoichiometry (Ben Twining, Bigelow Laboratories)
Webcast video
9:40 Theme co-chairs summarize highlights – 5 min on each theme
Theme 1 Highlights for breakout – Mak Saito
Webcast
Slides (PDF)
Slides (PowerPoint)
Theme 2 Highlights for breakout – John Dunne
Webcast
Slides (PDF)
Slides (PowerPoint)
Theme 3 Highlights for breakout – Greg Cutter
Webcast
Slides (PDF)
Slides (PowerPoint)
10:00 Organize Working Groups – Directions to breakout sessions
10:30 Break – Pick up refreshments en route to breakout sessions
The Monell auditorium must be vacated promptly at 10:30 for another event.
Follow local student guides to breakout rooms
10:50 Working groups, Science Themes 1, 2 & 3, Session 1
Define uncertainties and identify priority questions
12:10 Lunch (Monell Lobby)
1:20 Return to working groups
4:00 Break (Refreshments in Monell Lobby – tentative)
4:30 Plenary reports from Working Groups – (Comer 1st floor conference room; follow local student guides)
Theme 1 Participants reformed as two new groups. The overall presentation for both groups was given by Bethany Jenkins.
Webcast video covering Groups A and B
Slides (PDF)
Slides (PowerPoint)
Group 1A: Stoichiometry and Co-Limitation:
Deep chlorophyll maximum as a natural laboratory; metal-macronutrient ratios; phytoplankton functional groups; cell metal quotas.
Group 1B: Uptake and bioavailability:
Size classes; Identifiable pools of bioavailable Fe; Demand = Quota X growth rate; Can demand be met by soluble Fe alone?; Functional groups and growth rates; Modeling uptake as a function of metal speciation; Bacterial metal requirements.
Theme 2 initially involved a large group of participants who separated into two subgroups, one on small-scale (molecular, cellular) processes and one on large-scale (basin to global) processes.
Group 2A: Small-scale processes, presentation by Gideon Henderson:
Abiotic scavenging; interpretation of Kd, adsorption and desorption; role of organic coatings; ligands; nepheloid layers.
Webcast
(Note: Video is blurred between 4:30 – 6:48 and again between 19:47 and 21:13, but the audio is fine).
Slides (PDF)
Slides (PowerPoint)
Group 2B: Large-scale processes, presentation by Chris Hayes
Iron residence time and its sensitivity to Fe source and speciation; reversible scavenging; preformed trace element concentrations; nepheloid layers; experimental techniques; vertical migration of zooplankton; manganese oxides.
Webcast
Slides (PDF)
Theme 3 (Export and Regeneration) participants reformed as two sub-groups. The overall presentation of a merged product from both groups was given by Greg Cutter.
Variability with depth and environmental controls; variability in time, space and biogeographic regime; biotic vs. abiotic controls; elemental stoichiometry; bacteria and zooplankton; dissolved – particulate continuum; understanding paleo records; particle dynamics in models.
Webcast video covering both groups
Slides (PDF)
Slides (PowerPoint)
6:00 General discussion of working group progress and plans for next session
6:30 Dinner (Monell Lobby)
Buses and carpools return to hotels after dinner
Wednesday August 3, 2016
8:00 Continental breakfast (Monell Lobby)
9:00 Working groups, Science Themes 1, 2 & 3, Session 2
Contributed presentations by workshop participants – specific points related to the three workshop themes and the research questions identified by working groups on Tuesday.
PLEASE use the information in these files only to support development of the workshop synthesis products.
Adrian Burd – Planned programs relevant to workshop goals: EXPORTS and Biological Pump.
Webcast
Slides
Bill Smethie – Transient tracers, maximum entropy technique, and water mass ages to estimate rates of processes
Webcast
Slides
Alan Shiller – REE tracers of processes and comparison to Fe and Th
Webcast
Slides
Pete Sedwick – Advocacy for time series (BATS Fe)
Webcast
Slides
Alyson Santoro – Metal requirements to support steep gradients in nitrogen regeneration
Webcast
Slides
Alakendra Roychoudhury – Southern Ocean trace metals and dust sources
Webcast
Slides
Katsumi Matsumoto – Phytoplankton element stoichiometry plasticity
Webcast
Slides
Molly Martin – GEOTRACES GP16 (EPZT) oxygen utilization rate in historical context
Webcast
Slides
Maeve Lohan – Leachable particulate Fe as a tracer of scavenging and regeneration of dissolved Fe
Webcast
Slides
David Kadko – Oxygen utilization rates from 7Be
Webcast
Slides
Maxime Grand and Mariko Hatta – AOU vs dissolved Fe
Webcast
Slides
Steve Emerson – Mechanisms of carbon export – importance of DOC and implications for Metal/AOU ratios
Webcast
Slides
Greg Cutter – Nitrate and regeneration hot spots
Webcast
Slides
Adrian Burd – Particle aggregation models
Webcast
Slides
Erin Black – Th-derived export and regeneration rates of particulate trace metals
Webcast
Slides
Kathy Barbeau – Zooplankton vertical migration
Webcast
Slides
Bob Anderson – Full water column Th-derived fluxes and regeneration rates
Webcast
Slides
Discuss strategies to reduce uncertainties and answer outstanding questions
12:30 Lunch (Monell Lobby)
1:30 Working groups, Science Themes 1, 2 & 3, Session 3
Define strategies to reduce uncertainties
4:00 Break (Refreshments in Monell Lobby – tentative)
4:30 Plenary reports from Working Groups –– Defining workshop products (short term) and long-term goals for the community (Monell auditorium)
Theme 1: Biological uptake and Bioavailability – presentation by Mak Saito
Metals shape biogeographic provinces; Supply stoichiometry among trace elements and macronutrients; Deep chlorophyll maximum – light vs Fe limitation and metal uptake/scavenging; exploiting existing data to assess bioavailability using metal quotas.
Webcast
Slides (PDF)
Slides (PowerPoint)
Theme 2: Abiotic scavenging – presentation by John Dunne
Develop conceptual model for scavenging and test in models; particle and colloid dynamics; Kd and residence times, expanding to a broader range of metals, e.g., by normalizing to Th; ligand cycling and scavenging, expanding from micronutrients to thorium; statistical analysis (PCA) of metal distributions; organic coatings of mineral surfaces; nepheloid layers; dust; preformed concentrations in primary water masses; ideas for future programs to build upon GEOTRACES.
Webcast
Slides (PDF)
Slides (PowerPoint)
Theme 3: Export and Regeneration – presentation by Steve Emerson
Compare and contrast methods to estimate regeneration: Combine circulation, AOU and TEI distributions to derive TEI regeneration; full water column flux and regeneration from multiple Th isotopes; inverse model approach to regeneration rates (requires better definition of water mass end member composition); role of ligands in (re)mobilizing particulate TEIs exploiting high resolution data of deep chlorophyll maxima; exploit natural spatial variability of dust flux to assess role of dust in scavenging and regeneration; Recommendations for future GEOTRACES cruises: measure abundance of microbes together with TEIs, add TEIs to EXPORTS, flow cytometry and 16S, sediment traps and optical techniques to better characterize particle distribution.
Webcast
Slides
6:00 Plenary discussion of workshop products – (Monell auditorium)
(No video available)
6:30 Dinner (Monell Lobby)
Buses and carpools return to hotels after dinner
Thursday August 4, 2016
8:00 Continental breakfast (Monell Lobby)
9:00 Plenary discussion of workshop products and assignments – (Monell auditorium)
Comments from web viewers
Slides
Cross-Cutting Synthesis Topics
Slides
10:00 Break – Pick up refreshments en route to breakout sessions
10:30 Cross-cutting breakout sessions identified during the workshop
12:30 Lunch (Monell Lobby)
1:30 Plenary reports from working groups (Monell auditorium)
2:30 Plenary review and discussion of plans for workshop products to reduce uncertainties in trace element cycling (no video)
Theme 1 anticipated Products and Goals
TEI-AOU and Preformed TEIs Working Group Report
Flux, regeneration, particle dynamics and nepheloid layer groups
A link to an updated list of anticipated workshop products is given at the top of this page.
3:30 Adjourn workshop
Transportation to airports; informal dinner plans for those staying Thursday night