Spring-summer net community production, new production, particle export and related water column biogeochemical processes in the marginal sea ice zone of the Western Antarctic Peninsula 2012-2014

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Hugh W DucklowNicolas Cassar

Abstract

New production (New P, the rate of net primary production (NPP) supported by exogenously supplied limiting nutrients) and net community production (NCP, gross primary production not consumed by community respiration) are closely related but mechanistically distinct processes. They set the carbon balance in the upper ocean and define an upper limit for export from the system. The relationships, relative magnitudes and variability of New P (from 15NO3- uptake), O2 : argon-based NCP and sinking particle export (based on the 238U : 234Th disequilibrium) are increasingly well documented but still not clearly understood. This is especially true in remote regions such as polar marginal ice zones. Here we present a 3-year dataset of simultaneous measurements made at approximately 50 stations along the Western Antarctic Peninsula (WAP) continental shelf in midsummer (January) 2012-2014. Net seasonal-scale changes in water column inventories (0-150 m) of nitrate and iodide were also estimated at the same stations. The average daily rates based on inventory changes exceeded the shorter-term rate measurements. A major uncertainty in the relative magnitude of the inventory estimates is specifying the start of the growing season following se...Continue Reading

References

Apr 4, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Hugh W DucklowWilliam Fraser
Feb 6, 2009·Analytical Chemistry·Nicolas CassarBronte Tilbrook
Jul 20, 2012·Annual Review of Marine Science·Peter J le B WilliamsMichael J Behrenfeld
Jul 20, 2012·Annual Review of Marine Science·Hugh W Ducklow, Scott C Doney
Jun 27, 2014·Environmental Science. Processes & Impacts·Rosie ChanceTim D Jickells
Apr 10, 2016·Experimental Brain Research·Sungjae HwangJohn J Jeka
Apr 11, 2018·Global Change Biology·Jeff S BowmanHugh W Ducklow
May 16, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Robert M SherrellMichael P Meredith

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Citations

May 16, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Katharine R HendryHugh W Ducklow

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