Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer

ABSTRACT Phytoplankton is a sentinel group of organisms of climate change due to their capacity to respond to multiple stressors, so studies documenting the optimal optical conditions within the water column affecting their growth and production are imperative. As a contribution to this topic, this...

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Autores principales:	Coria-Monter,Erik, Gracia,Adolfo, Salas-de-León,David Alberto, Monreal-Gómez,María Adela, Durán-Campos,Elizabeth
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2021
Materias:	optical characterization photosynthetically active radiation in situ measurements phytoplankton deep-waters Gulf of Mexico
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000400654
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spelling	oai:scielo:S0718-560X20210004006542021-09-27Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summerCoria-Monter,ErikGracia,AdolfoSalas-de-León,David AlbertoMonreal-Gómez,María AdelaDurán-Campos,Elizabeth optical characterization photosynthetically active radiation in situ measurements phytoplankton deep-waters Gulf of Mexico ABSTRACT Phytoplankton is a sentinel group of organisms of climate change due to their capacity to respond to multiple stressors, so studies documenting the optimal optical conditions within the water column affecting their growth and production are imperative. As a contribution to this topic, this study report selected optical properties in deep-waters of the Gulf of Mexico by in situ measurements during summertime. A multidisciplinary research cruise was carried during August/September of 2018. A CTD instrument configured with underwater quantum and fluorescence sensors were used to acquire data of temperature, conductivity, depth, photosynthetically active radiation (PAR), and fluorescence of chlorophyll-a, which were used to determine selected optical coefficients, including the light extinction (k), the compensation light intensity (Ec), the compensation depth (Zc), the critical depth (Zcr), and the incident irradiance (E0). The Brunt-Väisälä frequency calculated from CTD data was used as a magnitude indicator of the water column stratification. The results showed a pycnocline located between 23 and 68 m depth, and favorable conditions for phytoplankton production with high values of E0 reaching 1523.4 μmol m−2 s−1, Ec values ranging from 3 to 8 μmol m−2 s−1, values of Zcr greater than Zc and maximum records of k values of 0.06. Based on multivariate statistical techniques, two zones were clearly defined. These results represent the first observational report on the optical properties in the deep region of the Gulf of Mexico. Studies on the ideal optical conditions for carrying out phytoplankton photosynthesis and their possible seasonal and interannual variability are essential to understand the processes that support the phytoplankton production, especially in regions that are characterized by their high biodiversity.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.49 n.4 20212021-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000400654en10.3856/vol49-issue4-fulltext-2668
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	optical characterization photosynthetically active radiation in situ measurements phytoplankton deep-waters Gulf of Mexico
spellingShingle	optical characterization photosynthetically active radiation in situ measurements phytoplankton deep-waters Gulf of Mexico Coria-Monter,Erik Gracia,Adolfo Salas-de-León,David Alberto Monreal-Gómez,María Adela Durán-Campos,Elizabeth Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer
description	ABSTRACT Phytoplankton is a sentinel group of organisms of climate change due to their capacity to respond to multiple stressors, so studies documenting the optimal optical conditions within the water column affecting their growth and production are imperative. As a contribution to this topic, this study report selected optical properties in deep-waters of the Gulf of Mexico by in situ measurements during summertime. A multidisciplinary research cruise was carried during August/September of 2018. A CTD instrument configured with underwater quantum and fluorescence sensors were used to acquire data of temperature, conductivity, depth, photosynthetically active radiation (PAR), and fluorescence of chlorophyll-a, which were used to determine selected optical coefficients, including the light extinction (k), the compensation light intensity (Ec), the compensation depth (Zc), the critical depth (Zcr), and the incident irradiance (E0). The Brunt-Väisälä frequency calculated from CTD data was used as a magnitude indicator of the water column stratification. The results showed a pycnocline located between 23 and 68 m depth, and favorable conditions for phytoplankton production with high values of E0 reaching 1523.4 μmol m−2 s−1, Ec values ranging from 3 to 8 μmol m−2 s−1, values of Zcr greater than Zc and maximum records of k values of 0.06. Based on multivariate statistical techniques, two zones were clearly defined. These results represent the first observational report on the optical properties in the deep region of the Gulf of Mexico. Studies on the ideal optical conditions for carrying out phytoplankton photosynthesis and their possible seasonal and interannual variability are essential to understand the processes that support the phytoplankton production, especially in regions that are characterized by their high biodiversity.
author	Coria-Monter,Erik Gracia,Adolfo Salas-de-León,David Alberto Monreal-Gómez,María Adela Durán-Campos,Elizabeth
author_facet	Coria-Monter,Erik Gracia,Adolfo Salas-de-León,David Alberto Monreal-Gómez,María Adela Durán-Campos,Elizabeth
author_sort	Coria-Monter,Erik
title	Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer
title_short	Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer
title_full	Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer
title_fullStr	Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer
title_full_unstemmed	Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer
title_sort	optical characterization of the deep-waters of the gulf of mexico by in situ par during summer
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2021000400654
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Optical characterization of the deep-waters of the Gulf of Mexico by in situ PAR during summer

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