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:	T. Hull, N. Greenwood, A. Birchill, A. Beaton, M. Palmer, J. Kaiser
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/60b65ee79c1f4948950c93a3b0424b78
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id	oai:doaj.org-article:60b65ee79c1f4948950c93a3b0424b78
record_format	dspace
institution	DOAJ
collection	DOAJ
language	EN
topic	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5
spellingShingle	Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 T. Hull T. Hull N. Greenwood N. Greenwood A. Birchill A. Birchill A. Beaton M. Palmer J. Kaiser Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
description	<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>
format	article
author	T. Hull T. Hull N. Greenwood N. Greenwood A. Birchill A. Birchill A. Beaton M. Palmer J. Kaiser
author_facet	T. Hull T. Hull N. Greenwood N. Greenwood A. Birchill A. Birchill A. Beaton M. Palmer J. Kaiser
author_sort	T. Hull
title	Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
title_short	Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
title_full	Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
title_fullStr	Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
title_full_unstemmed	Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
title_sort	simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/60b65ee79c1f4948950c93a3b0424b78
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spelling	oai:doaj.org-article:60b65ee79c1f4948950c93a3b0424b782021-12-01T08:20:10ZSimultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider10.5194/bg-18-6167-20211726-41701726-4189https://doaj.org/article/60b65ee79c1f4948950c93a3b0424b782021-12-01T00:00:00Zhttps://bg.copernicus.org/articles/18/6167/2021/bg-18-6167-2021.pdfhttps://doaj.org/toc/1726-4170https://doaj.org/toc/1726-4189<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>T. HullT. HullN. GreenwoodN. GreenwoodA. BirchillA. BirchillA. BeatonM. PalmerJ. KaiserCopernicus PublicationsarticleEcologyQH540-549.5LifeQH501-531GeologyQE1-996.5ENBiogeosciences, Vol 18, Pp 6167-6180 (2021)

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

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