Arctic break out session

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Presentation transcript:

Arctic break out session Jeremy Mathis (chair) Daniela Turk Kyle McDonald Rob Striegl Erika Podest Laodong Guo Miguel Goni Helmuth Thomas Observational efforts Process considerations

Observational efforts Shipboard observations (US Arctic, Chukchi Sea, Bering Sea, Canadian Archipelago, eastern Arctic) DIC, TA pCO2, nutrients, hydrography, tracers Moorings Chukchi Sea, Canad. Archipelago Land based/river observations Major Arctic rivers (Carbon metabolism stream to estuary) Airborne studies land atmosphere carbon exchange Yukon valley/river Satellite studies with some focus on land systems, thawing/freezing periods Process studies Bering Sea, Amundsen Gulf

Processes River estuary fluxes: Cross shelf exchange Constraining average concentrations Sources Discharge under ice Coastal erosion/permafrost thawing -> Corg. carbon input, reactivity?? Coastal erosion, POC flux Shift in DOC/DIC ratio while thawing of permafrost toward lower ratio (more remineralization in rivers) more TA, DIC, less Corg?) Changing processes -> climate change Cross shelf exchange Moorings, (radio)-tracers

Sediment burial / productivity Processes Sediment burial / productivity Radio tracers approaches tough at seasonal timescales due to methods Arctic never at steady state, too dynamic Sediment trap studies 2003/2004 (normal ice), and 2007/2008 low ice (Changing processes -> climate change) Representation of actual processes Places where no measurements have been made until recently due to accessibility Productivity measurements What to measure best: DIC-NCP approach, biological species/ foodweb approaches Ice dynamics vs. productivity Cloud cover, ice cover vs. satellite observations

Processes Air-sea exchange: Ice cover interactions constraining CO2 flux through ice other gases: Methane? Will changes in ice cover effect the flux of methane (to the coast), change in sink/source status? CO2 flux out of Yukon/rivers? Enhanced delivery of DOM -> respiratory CO2 increased? Soil respiration vs. in-stream respiration, DOC vs. POC. Shifting DOM respiration in location (upstream with warming)? groundwater fluxes might increase with thawing/warming. Role/location of groundwater contribution upstream vs. coastal location? Groundwater flow system is changing at the entire scales, not only at the coastal side. Satellite and duration of thawing period (over land satellite sees 25km grid cell) More/less DOM respiration, or shift of location timing?