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. The continental shelf seas are important at a global scale for ecosystem services.These highly dynamic regions are under a wide range of stresses, and as such future management requires appropriate monitoring measures.A key metric to understanding and predicting future change are the rates of biological production.We present here the use of an autonomous underwater glider with an oxygen (O2) and a wet-chemical microfluidic total oxidised nitrogen (NOx-=NO3-+NO2-) sensor during a spring bloom as part of a 2019 pilot autonomous shelf sea monitoring study.We find exceptionally high rates of net community production using both O2 and NOx- water column inventory changes,corrected for air–sea gas exchange in case of O2.We compare these rates with 2007 and 2008 mooring observations finding similar rates of NOx- consumption.With these complementary methods we determine the O2:N amount ratio of the newly produced organic matter (7.8 ± 0.4) and the overall O2:N ratio for the total water column (5.7 ± 0.4).The former is close to the canonical Redfield O2:N ratio of 8.6 ± 1.0,whereas the latter may be explained by a combination of new organic matter production and preferential remineralisation of more reduced organic matter at a higher O2:N ratio below the euphotic zone.

Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider