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Modelling of Biogeochemical Cycles and Ecosystems in the Arctic Ocean

Participants: Nadja Steiner (DFO/EC), Dieter Wolf-Gladrow (AWI), Diane Lavoie (DFO),David Plummer (EC), Yvonnick Le Clainche (U. Rimouski), Clara Deal (IARC/UAF), Leif Anderson (U Gotenborg), Mat Reagan (Berkeley Lab). Modelling of Biogeochemical Cycles and Ecosystems in the Arctic Ocean.

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Modelling of Biogeochemical Cycles and Ecosystems in the Arctic Ocean

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  1. Participants: Nadja Steiner (DFO/EC), Dieter Wolf-Gladrow (AWI), Diane Lavoie (DFO),David Plummer (EC), Yvonnick Le Clainche (U. Rimouski), Clara Deal (IARC/UAF), Leif Anderson (U Gotenborg), Mat Reagan (Berkeley Lab) Modelling of Biogeochemical Cycles and Ecosystems in the Arctic Ocean 2009 ASM Montreal Biogeochemical Outbreak

  2. 2009 ASM Montreal Biogeochemical Outbreak 1. Science questions that can be best answered with coupled Arctic regional climate models; science questions missing from existing plans. Time scales: current/preindustrial, future (next decades), past (glacial-interglacial and beyond)‏ What is the impact of climate-relevant gases produced in the ocean on Arctic climate? How will cycling of elements (C,N,P,Ca,S,O,Fe) change in the next decades? Strengths of biogeochemical feedbacks.

  3. 2009 ASM Montreal Biogeochemical Outbreak Cycling of nutrients and organic matter in the current system: What are the major processes? Rates? Coherent quantitative description? How much food is available for higher trophic levels? (fish, mammals), Occurance of HABs... Future changes due to temperature change, retreat/vanishing of summer sea ice, ocean acidification, coastal erosion, melting of permafrost, ...: What is the impact on cycling of nutrients and organic matter? Change in marine ecosystems (primary production, species assemblage, ..., impact on higher trophic levels)?

  4. 2009 ASM Montreal Biogeochemical Outbreak Biogeochemical feedbacks Sulfur: DMS -> Cloud Condensation Nuclei (CCN) -> -> radiation -> temperature -> ... Impact of phytoplankton blooms on mixed layer temperature (Manizza et al., 2005)‏ Impact of ice algae on melting of sea ice (Zeebe et al., 1996)‏ (Biogeo)chemistry in sea ice: discovery of ikaite (CaCO3 * H2O), consequences for bromine oxid (BrO)‏ formation and ozone depletion events (ODEs) in polar marine boundary layer, mercury sink, carbon flux within sea-ice, marine carbonate system

  5. 2009 ASM Montreal Biogeochemical Outbreak Biogeochemical feedbacks Instability of gashydrates -> CH4 release from sediments -> oxidation of CH4 in the water column -> ... (bacterial request of copper: Scott Elliot)‏ Impact of black carbon on albedo and melting of sea ice Input of nutrients (including metals) and various forms of carbon: transformations in the river-sea transition zone. Dissolution of CaCO3 in surface sediments (ocean acidification)

  6. 2009 ASM Montreal Biogeochemical Outbreak Biogeochemical feedbacks Instability of gashydrates -> CH4 release from sediments -> oxidation of CH4 in the water column -> ... (bacterial request of copper: Scott Elliot)‏ Impact of black carbon on albedo and melting of sea ice Input of nutrients (including metals) and various forms of carbon: transformations in the river-sea transition zone. Dissolution of CaCO3 in surface sediments (ocean acidification)

  7. 2009 ASM Montreal Biogeochemical Outbreak The inclusion of a biogeochemical process into coupled models makes sense only when the corresponding feedback implemented, e.g. when, for example, atmospheric DMS and its transformation is included.What do atmospheric models represent?

  8. 2009 ASM Montreal Biogeochemical Outbreak 2. Existing/planned modelling and model validation efforts to address the above AWI: Polarstern expeditions (central Arctic, Fram Strait) Various research activities in the Lena Delta and Laptev Sea (river input, coastal erosion, sedimentation)‏ Needed: historical data review, archive...... -> develop modified sampling strategies

  9. 2009 ASM Montreal Biogeochemical Outbreak 3. Reasonable boundaries for the 'Arctic System' for respective research areas; What are the opportunities and limitations due to a limited Arctic model domain? Hydrological cycle under global change requires larger domain (or time dependent boundary conditions). The same applies on somewhat longer time scale to inflow of Atlantic and Pacific water. Opportunities: better representation of small scale processes

  10. 2009 ASM Montreal Biogeochemical Outbreak 4. How are observations incorporated into model development and how can the link be improved? Parameterizations of various processes based on observations. Data assimilation/inverse models to improve parameterizations. Involve modellers in development of sampling strategies (What is needed? What is possible?)‏ Involve observers in model development - improve process understanding => Two way communication !!! Modellers need to tell funding agencies they need observations (seasonal data, fill local gaps, archive historical data)‏

  11. 2009 ASM Montreal Biogeochemical Outbreak 5. Would regional modelling efforts benefit from an international, centralized method for sharing model output for intercomparison and for sharing validation data and validation code/methods? Yes! Open access of model output and observations parallel to publication of articles (collaborative ?). Compare: open access to CO2 observations (CDIAC). Data center for validation and intercomparison: provide constraints for data submission

  12. 2009 ASM Montreal Biogeochemical Outbreak 6. What interactions are there between regional modelling and global modelling in your field of research? Would projects benefit from a community-coordinated program for obtaining data from and sharing model output with a global modelling community? Need interaction for time dependent boundary conditions... Compexity of ecosystem models - global versus regioal CCCma - close collaboration between global GCM and RCM, forecast .... for ecosystem only starting. other groups similar? CICE, many groups collaborating, development of parameterisations

  13. 2009 ASM Montreal Biogeochemical Outbreak 7. What plans are in action for including emerging modules into existing regional arctic models? IARC/UAF/LANL: Regional ecosystem, ice algae , nutrients in CICE (sea-ice internal), DMS within ice DFO/EC: Earth system model developments, ecosystem models in ocean models, 1-D: marine sulphur cycle (DMS), ice algae Berkely Lab/ LANL: coupling a gas hydrate/methane model in POP

  14. 2009 ASM Montreal Biogeochemical Outbreak 8. What human dimension modelling is being done in conjunction with physical modelling?

  15. 2009 ASM Montreal Biogeochemical Outbreak 9. What are possible interface strategies for collaboration between natural-science modelling and research on adaptation and human living conditions? Importance of river input ( Influx Changes with land use changes, permafrost melting)‏ Ocean acidification Fisheries Harmful algal blooms (HABs), ...

  16. 2009 ASM Montreal Biogeochemical Outbreak 10.What level of interaction between components is desirable? Depending on feedbacks (examples: Atmospheric deposition Gas exchange with retreating ice cover, ice ecosystem, river inflow ...)‏

  17. 2009 ASM Montreal Biogeochemical Outbreak 11. What is the benefit of interactive coupling on the complete system? Inclusion of feedbacks. Continuous simulations

  18. 2009 ASM Montreal Biogeochemical Outbreak 12. Which other components should your component be coupled to? Answer depends on questions/time scales. Start: atmosphere, ocean, ice, pelagic ecosystem (carbonate system, nutrients, plankton)‏ ecosystem in the ice climatically active gases ... On longer time scales: add sediment module

  19. 2009 ASM Montreal Biogeochemical Outbreak 13. On what time scale is interactive coupling/one-way coupling useful? General answer: depends on the feedback(s) under investigation Limitation due to boundary conditions in regional models. What is required: list of possible feedbacks, their strengths and their characteristic time constants.

  20. 2009 ASM Montreal Biogeochemical Outbreak Coupling of ecosystem models with circulation models The coupling of ecosystem models to circulation models is relative easy because the various compartments of ecosystem models (nutrients, DIC, TA, phytoplankton, zooplankton) can be treated similar to other passive tracers, however, with specific sources and sinks. Thus the implementation should be possible in less than one month. For gases (CO2, DMS, ...) air-sea gas-exchange has to be added.

  21. 2009 ASM Montreal Biogeochemical Outbreak The End Thanks for your attention

  22. 2009 ASM Montreal Biogeochemical Outbreak Discussion

  23. 2009 ASM Montreal Biogeochemical Outbreak Steiner & Denman 2008

  24. 2009 ASM Montreal Biogeochemical Outbreak Steiner & Denman 2008

  25. 2009 ASM Montreal Biogeochemical Outbreak Steiner & Denman 2008

  26. 2009 ASM Montreal Biogeochemical Outbreak Ikaite

  27. 2009 ASM Montreal Biogeochemical Outbreak Loose et al. 2009

  28. 2009 ASM Montreal Biogeochemical Outbreak Type of questions Global: cycles of elements Regional: climate-relevant gases, food production (fisheries, higher trophic levels)‏ Local: variations in ecosystems Fundamental: fast changes Carmack & Wassmann, 2006

  29. 2009 ASM Montreal Biogeochemical Outbreak Manizza et al. 2005

  30. 2009 ASM Montreal Biogeochemical Outbreak Organic Carbon Budget: Arctic Ocean vs. Global OceanStein & Macdonald (2004)‏ Quantity Arctic Ocean Global Ocean Primary production > 330 (1%) 30000 - 50000 River input (POC) 5.5 130-200 River input (DOC) 24.5(10%) 210-230 Eolian input 1.7 100-320 Coastal erosion 5.4 ? units: all values in 106 t C year-1

  31. 2009 ASM Montreal Biogeochemical Outbreak Manizza et al. 2005

  32. 2009 ASM Montreal Biogeochemical Outbreak Manizza et al. 2008

  33. 2009 ASM Montreal Biogeochemical Outbreak Zeebe et al. 1996

  34. 2009 ASM Montreal Biogeochemical Outbreak Dieckmann et al. 2008

  35. 2009 ASM Montreal Biogeochemical Outbreak Morin et al. 2008 Atmos. Chem. Phys., 8, 7317–7324, 2008 www.atmos-chem-phys.net/8/7317/2008/

  36. 2009 ASM Montreal Biogeochemical Outbreak Zhao et al. 2008

  37. 2009 ASM Montreal Biogeochemical Outbreak Earth System Model … expansion of the COSMOS Modules (following COSMOS)‏ Ice sheets model: Mass balance & sea level Ice-ocean interaction Permafrost ECHAM5 Chemistry Isotope Proxy Models Isotope modules: 13C,18O,30Si ice cores, marine sediments, … Ice Sheets Model OASIS • Biogeochemistry/Ecosystem • marine biogeochemical cycles • (based on RECOM)‏ • continental weathering input • sediment module MPI-OM HAMOCC5 Programme: PACES

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