Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
<p>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 rate...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/60b65ee79c1f4948950c93a3b0424b78 |
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| Sumario: | <p>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 (<span class="inline-formula">O<sub>2</sub></span>) and a wet-chemical microfluidic total oxidised nitrogen (<span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><mrow class="chem"><msup><msub><mi mathvariant="normal">NO</mi><mi>x</mi></msub><mo>-</mo></msup></mrow><mo>=</mo><msup><mrow class="chem"><msub><mi mathvariant="normal">NO</mi><mn mathvariant="normal">3</mn></msub></mrow><mo>-</mo></msup><mo>+</mo><msup><mrow class="chem"><msub><mi mathvariant="normal">NO</mi><mn mathvariant="normal">2</mn></msub></mrow><mo>-</mo></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="109pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="409333b671deea5f9edff7765dfec49e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-18-6167-2021-ie00001.svg" width="109pt" height="15pt" src="bg-18-6167-2021-ie00001.png"/></svg:svg></span></span>) 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 <span class="inline-formula">O<sub>2</sub></span> and <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M4" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><msub><mi mathvariant="normal">NO</mi><mi>x</mi></msub><mo>-</mo></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="31pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="d9c234e39184fff862105df14f04120f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-18-6167-2021-ie00002.svg" width="31pt" height="14pt" src="bg-18-6167-2021-ie00002.png"/></svg:svg></span></span> water column inventory changes,
corrected for air–sea gas exchange in case of <span class="inline-formula">O<sub>2</sub></span>.
We compare these rates with 2007 and 2008 mooring observations finding similar rates of <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M6" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><msub><mi mathvariant="normal">NO</mi><mi>x</mi></msub><mo>-</mo></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="31pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="a4c4c99bafc2a48051e735ec178221a8"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="bg-18-6167-2021-ie00003.svg" width="31pt" height="14pt" src="bg-18-6167-2021-ie00003.png"/></svg:svg></span></span> consumption.
With these complementary methods we determine the <span class="inline-formula">O<sub>2</sub>:N</span> amount ratio of the newly produced organic matter (7.8 <span class="inline-formula">±</span> 0.4) and the overall <span class="inline-formula">O<sub>2</sub>:N</span> ratio for the total water column (5.7 <span class="inline-formula">±</span> 0.4).
The former is close to the canonical Redfield <span class="inline-formula">O<sub>2</sub>:N</span> ratio of 8.6 <span class="inline-formula">±</span> 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 <span class="inline-formula">O<sub>2</sub>:N</span> ratio below the euphotic zone.</p> |
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