Biogeochemical Fluxes in the Deep Canada Basin: Preserving a Vital Archive

Steven Manganini, Geology & Geophysics
Rick Krishfield, Physical Oceanographyu



Since 2004, we have sustained a time‐series biogeochemical program in the Arctic, during a period of unprecedented ice‐retreat, focused upon biogeochemical fluxes and dynamics in the deep Canada Basin. The sustained field program has consisted of 3 PARFLUX 21‐position time‐series sediment traps installed at 3000m depth onto 3 intermediate moorings in the deep Canada Basin. Each mooring is equipped with hydrographic instrumentation and serviced annually by the AON:BGOS Program. By conducting our studies in concert with the complimentary AON‐BGOS program we provide data required to facilitate a rigorous evaluation of the links between biogeochemical fluxes and hydrographic properties in the cryogenic central Arctic Ocean.
In a new initiative we have recently sought to begin a project that would be complementary to the AON:BGOS project, combining modeling with observations to improve our understanding of what controls the biogeochemical fluxes to the Canada Basin seafloor and how they will change as conditions in the Arctic continue to evolve, rapidly. We are now awaiting confirmation whether our AON:OMBF (Observation & Modeling of Biogeochemical Fluxes) project will be approved by NSF. But in the meantime, the successful recovery of last year’s sediment traps has resulted in the collection of 63 further samples, now stored at WHOI awaiting processing and archiving. We have now entered an important time‐critical “gap”, therefore, where these wet particle sediment trap samples need preliminary processing, to ensure that they do not spoil possibly due to preservative “flush‐out” during collection exposure and that the time‐series records over the entire decade does not get compromised, faster than any NSF funding is received ‐ hence this modest request. We request OCCI funding to process, split, and organize the 63 recently collected sediment traps samples and store them in a condition of archived status for future biogeochemical processing once NSF funding is secured.